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Science M.C.Q

Carbon and its Compounds · UP Board (UPMSP) STD 10 (UPMSP - English Medium). 52 questions.

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MCQ 11 Mark
Vinegar is a solution of about:
  • A
    5 to 8 per cent ethanoic acid in alcohol.
  • ✓
    5 to 8 per cent ethanoic acid in water.
  • C
    50 to 80 per cent ethanoic acid in water.
  • D
    50 to 80 per cent ethanoic acid in alcohol.
Answer
Correct option: B.
5 to 8 per cent ethanoic acid in water.
Vinegar is a solution comprising 5 to 8 percent ethanoic acids mixed with water.
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MCQ 21 Mark
When ethanol reacts with sodium metal, it forms two products. These products are:
  • A
    Sodium ethanaoate and oxygen.
  • B
    Sodium ethanaoate and hydrogen.
  • C
    Sodium ethoxide and oxygen.
  • ✓
    Sodium ethoxide and hydrogen.
Answer
Correct option: D.
Sodium ethoxide and hydrogen.
When ethanol reacts with sodium, sodium ethoxide is formed and hydrogen gas is evolved.
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MCQ 31 Mark
In a soap micelle, the soap molecules are arranged radially with:
  • A
    Ionic ends directed towards the centre and hydrocarbon ends directed outwards.
  • ✓
    Hydrocarbon ends directed towards the centre and ionic ends directed outwards.
  • C
    Both ionic ends and hydrocarbon ends directed toward the centre.
  • D
    Both hydrocarbon ends and ionic ends directed outwards
Answer
Correct option: B.
Hydrocarbon ends directed towards the centre and ionic ends directed outwards.
In a soap micelle, the soap molecules are arranged radially with the hydrocarbon ends, i.e. hydrophobic, directed towards the centre; and, ionic ends, i.e. hydrophilic, directed outwards.
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MCQ 41 Mark
The hydrocarbon which has alternate single and double bonds arranged in the form of a ring is:
  • A
    Cyclobutane.
  • ✓
    Benzene.
  • C
    Butene.
  • D
    Hexene.
Answer
Correct option: B.
Benzene.
Benzene is the hydrocarbon which has alternate single and double bonds arranged in the form of a ring.
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MCQ 51 Mark
The molecular formula of an organic compound is $\ce{C_{48}H_{94}}$ This compound belongs to the homologous series of:
  • ✓
    Alkenes.
  • B
    Aldehydes.
  • C
    Alkynes.
  • D
    Alkanes.
Answer
Correct option: A.
Alkenes.
The compound $\ce{C_{48}H_{94}}$ belongs to the homologous series of alkynes, as it satisfies the general formula $\ce{C_nH_{2n-2.}}$
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MCQ 61 Mark
The chemical which is not required for the preparation of soap in the laboratory is:
  • A
    Vegetable oil.
  • ✓
    Baking soda.
  • C
    Caustic soda.
  • D
    Common salt.
Answer
Correct option: B.
Baking soda.
Baking soda is not required for the preparation of soap in the laboratory. For the preparation of soap, vegetable oil, caustic soda and common salt are needed.
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MCQ 71 Mark
The organic compound prepared by Wohler from an inorganic compound called ammonium cyanate was:
  • A
    Glucose.
  • ✓
    Urea.
  • C
    Uric acid.
  • D
    Vinegar.
Answer
Correct option: B.
Urea.
Urea is the organic compound prepared by Wohler from an inorganic compound called ammonium cyanate.
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MCQ 81 Mark
When a vegetable oil is treated with hydrogen in the presence of nickel (or palladium) catalyst, it forms a fat. This is an example of:
  • A
    Anodising reaction.
  • B
    Substitution reaction.
  • C
    Displacement reaction.
  • ✓
    Addition reaction.
Answer
Correct option: D.
Addition reaction.
When a vegetable oil is treated with hydrogen in the presence of nickel or palladium catalyst, an addition reaction takes place and a saturated fat is formed.
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MCQ 91 Mark
The number of carbon atoms in the organic compound named as $2,2-$dimethylpropane is:
  • A
    Two.
  • ✓
    Five.
  • C
    Three.
  • D
    Four.
Answer
Correct option: B.
Five.
The number of carbon atoms in the organic compound $2, 2-$dimethylpropane $\ce{(C_5H_{12})}$ is $5. 2, 2-$dimethylpropane is one of the three isomers of pentane.
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MCQ 101 Mark
A diamond-toothed saw is usually used for cutting:
  • A
    Steel girders.
  • B
    Logs of wood.
  • ✓
    Marble slabs.
  • D
    Asbestos sheets.
Answer
Correct option: C.
Marble slabs.
A diamond-toothed saw is usually used for cutting marble slabs.
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MCQ 111 Mark
A cyclic hydrocarbon having carbon$-$carbon single bonds as well as carbon$-$carbon double bonds in its molecule is:
  • A
    $\ce{C_6H_{12}}$
  • B
    $\ce{C_6H_{14}}$
  • ✓
    $\ce{C_6H_6}$
  • D
    $\ce{C_6H_{10}}$
Answer
Correct option: C.
$\ce{C_6H_6}$
Benzene $\ce{(C_6H_6​​​​​​​)}$ is the cyclic hydrocarbon having carbon$-$carbon single bonds as well as carbon$-$carbon double bonds in its molecule.
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MCQ 121 Mark
When ethanol is heated with concentrated sulphuric acid at 170°C, it gets converted into ethene. In this reaction, concentrated sulphuric acid acts as:
  • A
    Oxidising agent.
  • B
    Catalyst.
  • ✓
    Dehydrating agent.
  • D
    Reducing agent.
Answer
Correct option: C.
Dehydrating agent.
Sulphuric acid acts as a dehydrating agent as it removes water molecules from the alcohol (ethanol), and converts it to ethane.
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MCQ 131 Mark
Butanone is a four$-$carbon compound having the functional group:
  • A
    $\ce{−OH}$
  • B
    $\ce{−COOH}$
  • ✓
    $\ce{−CO−}$
  • D
    $\ce{−CHO}$
Answer
Correct option: C.
$\ce{−CO−}$
Butanone $\ce{(C_2H_5-CO-CH_3)}$ is a four$-$carbon compound having the functional group $\ce{-CO-}$ $($ketones$).$
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MCQ 141 Mark
An alkyne has seventy five carbon atoms in its molecule. The number of hydrogen atoms in its molecule will be:
  • A
    $150$
  • ✓
    $148$
  • C
    $152$
  • D
    $146$
Answer
Correct option: B.
$148$
The number of hydrogen atoms in an alkyne that has $75$ carbon atoms in its molecule is $148.$ The general formula of the alkynes is $\ce{C_nH_{2n - 2}}$, where $'n\ '$ is the number of carbon atoms in each molecule. Substituting $n = 75$ in the formula of alkynes, we get the number of hydrogen atoms to be $148.$
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MCQ 151 Mark
The fuel which usually burns with a blue flame is:
  • A
    Coal.
  • ✓
    LPG.
  • C
    Candle wax.
  • D
    Kerosene (in lamp).
Answer
Correct option: B.
LPG.
LPG is the fuel which usually burns with a blue flame, as the burner of a stove has many holes to allow enough oxygen for complete combustion.
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MCQ 161 Mark
The substance which can produce brisk effervescence with baking soda solution is:
  • A
    Ethanol.
  • B
    Vegetable oil.
  • ✓
    Vinegar.
  • D
    Soap.
Answer
Correct option: C.
Vinegar.
Vinegar can produce brisk effervescence with the baking soda solution.
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MCQ 171 Mark
One of the following is not an allotrope of carbon. This is:
  • A
    Diamond.
  • B
    Graphite.
  • ✓
    Cumene.
  • D
    Buckministerfullerene.
Answer
Correct option: C.
Cumene.
Cumene is not an allotrope of carbon. Allotropes of carbon are diamond, graphite and buckminsterfullerene.
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MCQ 181 Mark
While cooking, if the bottom of the utensil is getting blackened on the outside, it means that:
  • A
    The food is not cooked completely.
  • ✓
    The fuel is not burning completely.
  • C
    The fuel is wet.
  • D
    The fuel is burning completely.
Answer
Correct option: B.
The fuel is not burning completely.
While cooking, if the bottom of the utensil is getting blackened on its outer side, it means that the fuel is not burning properly, thereby leading to soot formation.
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MCQ 191 Mark
Which of the following burns by producing a yellow, luminous flame?
  • A
    Natural gas.
  • B
    Coke.
  • ✓
    Wax.
  • D
    Charcoal.
Answer
Correct option: C.
Wax.
Due to incomplete combustion, wax burns by producing a yellow, luminous flame.
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MCQ 201 Mark
The organic compounds which are isomeric with one another are:
  • A
    Alcohols and aldehydes.
  • B
    Aldehydes and carboxylic acids.
  • ✓
    Ketones and aldehydes.
  • D
    Alcohols and ketones.
Answer
Correct option: C.
Ketones and aldehydes.
Ketones and aldehydes are the organic compounds which are isomeric to one another.
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MCQ 211 Mark
The hydrocarbon 2-methylbutane is an isomer of:
  • ✓
    n-pentane.
  • B
    n-butane.
  • C
    Propane.
  • D
    Iso-butane.
Answer
Correct option: A.
n-pentane.
The hydrocarbon 2-methylbutane is an isomer of n-pentane.
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MCQ 221 Mark
The number of isomers formed by the hydrocarbon with molecular formula $\ce{C_5H_{12}}$ is:
  • A
    $2$
  • B
    $5$
  • ✓
    $3$
  • D
    $4$
Answer
Correct option: C.
$3$
The number of isomers formed by the hydrocarbon pentane, with molecular formula $\ce{C_5H_{12},}$ is $3$. They are $n-$pentane, isopentane and neopentane.
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MCQ 231 Mark
Chlorine reacts with saturated hydrocarbons at room temperature in the:
  • A
    Absence of sunlight.
  • ✓
    Presence of sunlight.
  • C
    Absence of moisture.
  • D
    Presence of $\ce{H_2SO_4}$
Answer
Correct option: B.
Presence of sunlight.
When chlorine reacts with saturated hydrocarbons at room temperature and in the presence of sunlight, substitution reaction takes place.
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MCQ 241 Mark
The property of self-combination of the atoms of the same element to form long chains is known as:
  • A
    Protonation.
  • B
    Carbonation.
  • C
    Coronation.
  • ✓
    Catenation.
Answer
Correct option: D.
Catenation.
The property of atoms of an element to self-combine and form long chains is known as catenation.
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MCQ 251 Mark
The pair of elements which exhibits the property of catenation is:
  • A
    Sodium and silicon.
  • ✓
    Chlorine and carbon.
  • C
    Carbon and sodium.
  • D
    Silicon and carbon.
Answer
Correct option: B.
Chlorine and carbon.
Silicon and carbon exhibit the property of catenation.
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MCQ 261 Mark
One of the following substances is not added to make denatured alcohol. This is:
  • A
    Methyl alcohol.
  • B
    Copper sulphate.
  • ✓
    Chloroform.
  • D
    Pyridine.
Answer
Correct option: C.
Chloroform.
Chloroform is not an ingredient for manufacturing denatured alcohol. For denaturation of alcohol, methyl alcohol, copper sulphate and pyridine are used.
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MCQ 271 Mark
Out of the following pairs of compounds, the unsaturated compounds are:
  • A
    $\ce{C_2H_6}$ and $\ce{C_4H_6}$
  • B
    $\ce{C_6H_{12}}$ and $\ce{C_5H_{12}}$
  • ✓
    $\ce{C_4H_6}$ and $\ce{C_6H_{12}}$
  • D
    $\ce{C_2H_6}$ and $\ce{C_4H_{10}}$
Answer
Correct option: C.
$\ce{C_4H_6}$ and $\ce{C_6H_{12}}$
$\ce{C_4H_6}$ and $\ce{C_6H_{12}}$ are unsaturated compounds as they correspond to the formula $\ce{C_nH_{2n-2}}$ and $\ce{C_nH_{2n}.}$ They belong to the group alkyne and alkene respectively.
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MCQ 281 Mark
Which of the following molecular formula corresponds to ethylbutanoate ester?
  • A
    $\ce{C_5H_{10}O_2}$
  • ✓
    $\ce{C_6H_{12}O_2}$
  • C
    $\ce{C_7H_{14}O_2}$
  • D
    $\ce{C_8H_{16}O_2}$
Answer
Correct option: B.
$\ce{C_6H_{12}O_2}$
Ethylbutanoate ester has the molecular formula $\ce{C_6H_{12}O_2 (C_2H_5COOC_3H_7).}$
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MCQ 291 Mark
Which of the following cannot exhibit isomerism?
  • A
    $\ce{C_4H_{10}}$
  • B
    $\ce{C_5H_{12}}$
  • ✓
    $\ce{C_3H_8}$
  • D
    $\ce{C_6H_{14}}$
Answer
Correct option: C.
$\ce{C_3H_8}$
$\ce{C_3H_8}$​​​​​​​ is the compound which cannot exhibit isomerism, as it contains only $3$ carbon atoms. Isomerism is possible only with hydrocarbons containing $4$ or more carbon atoms.
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MCQ 301 Mark
A hydrocarbon having one double bond has $100$ carbon atoms in its molecule. The number of hydrogen atoms in its molecule will be:
  • ✓
    $200$
  • B
    $198$
  • C
    $202$
  • D
    $196$
Answer
Correct option: A.
$200$
Alkenes have double bonds and are represented by the formula $\ce{C_nH_{2n}}$. Here, $'n\ '$ is the number of carbon atoms in its molecule. Therefore, substituting $'n\ '$ with $100$ in the formula of the alkenes, we get $200$ hydrogen atoms.
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MCQ 311 Mark
One of the following organic compounds cannot decolourise the red-brown colour bromine water. This compound is:
  • A
    $\ce{C_{14}H_{28}}$
  • B
    $\ce{C_7H_{12}}$
  • ✓
    $\ce{C_6H_{14}}$
  • D
    $\ce{C_9H_{16}}$
Answer
Correct option: C.
$\ce{C_6H_{14}}$
$\ce{C_6H_{14}}$​​​​​​​ is an alkane as its formula can be expressed as $\ce{C_nH_{2n+2}​​​​​​​}$​​​​​​​. Alkanes are stable and cannot decolourize reddish-brown bromine water in the absence of a catalyst.
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MCQ 321 Mark
Which one of the following is not a fossil fuel?
  • A
    Petrol.
  • B
    Cock.
  • ✓
    Charcoal.
  • D
    Coal.
Answer
Correct option: C.
Charcoal.
Charcoal is not a fossil fuel. It is formed from wood and coal.
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MCQ 331 Mark
One of the following is not an allotrope of carbon. This is:
  • A
    Diamond.
  • B
    Graphite.
  • ✓
    Cumene.
  • D
    Buckministerfullerene.
Answer
Correct option: C.
Cumene.
Cumene is not an allotrope of carbon. Allotropes of carbon are diamond, graphite and buckminsterfullerene.
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MCQ 341 Mark
An unsaturated hydrocarbon having a triple covalent bond has $50$ hydrogen atoms in its molecule. The number of carbon atoms in its molecule will be:
  • A
    $24$
  • B
    $25$
  • ✓
    $26$
  • D
    $28$
Answer
Correct option: C.
$26$
The general formula for unsaturated hydrocarbons with triple bond, is $\ce{C_nH_{2n - 2}}$. Where $'n\ '$ is the number of atoms in one molecule. If the number of hydrogen atoms in its molecule is $50,$ then the number of carbon atoms should be $26 (2n - 2 = 50;$ therefore, $n = 26).$
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MCQ 351 Mark
The molecular formulae of some organic compounds are given below. Which of these compounds contains an aldehyde group?
  • A
    $\ce{C_3H_8O}$
  • B
    $\ce{C_3H_6O_2}$
  • ✓
    $\ce{C_3H_6O}$
  • D
    $\ce{C_3H_7Cl}$
Answer
Correct option: C.
$\ce{C_3H_6O}$
$\ce{C_3H_6O}$ contains an aldehydes group, as the compound satisfies the general formula of the aldehydes $\ce{C_nH_{2n}O.}$
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MCQ 361 Mark
The number of carbon atoms joined in a spherical molecule of buckminsterfullerene is:
  • A
    Fifty.
  • ✓
    Sixty.
  • C
    Seventy.
  • D
    Ninety.
Answer
Correct option: B.
Sixty.
The number of carbon atoms joined in a spherical molecule of buckminsterfullerene is 60.
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MCQ 371 Mark
The functional group present in propanal is:
  • A
    $\ce{−OH}$
  • B
    $\ce{−COOH}$
  • C
    $\ce{−CO−}$
  • ✓
    $\ce{−CHO}$
Answer
Correct option: D.
$\ce{−CHO}$
The functional group present in propanal $\ce{(C_2H_5CHO)}$ is $\ce{-CHO} ($aldehydes group$).$
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MCQ 381 Mark
Buckminsterfullerene is an allotropic form of the element:
  • A
    Phoshorus.
  • B
    Fluorine.
  • ✓
    Carbon.
  • D
    Sulphur.
Answer
Correct option: C.
Carbon.
Buckminsterfullerene is an allotropic form of the element carbon, and contains 60 carbon atoms joined in a spherical structure.
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MCQ 391 Mark
Which of the following can damage optic nerve leading to blindness, if taken internally?
  • A
    $\ce{CH_3COOH}$
  • B
    $\ce{C_2H_5OH}$
  • C
    $\ce{NaHCO_3}$
  • ✓
    $\ce{CH_3OH}$
Answer
Correct option: D.
$\ce{CH_3OH}$
$\ce{CH_3OH} ($methanol$),$ when consumed, oxidises into methanal into the liver. This causes coagulation of protoplasm in the cells, as methanal reacts rapidly with the components of the cells. Due to this, the cells stop functioning and damage the optic nerve leading to blindness.
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MCQ 401 Mark
The pencil leads are made of mainly:
  • A
    Lithium.
  • B
    Charcoal.
  • C
    Lead.
  • ✓
    Graphite.
Answer
Correct option: D.
Graphite.
The pencil leads are mainly made of graphite.
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MCQ 411 Mark
One of the following burns without producing a flame. This is:
  • A
    Wood.
  • ✓
    Charcoal.
  • C
    LPG.
  • D
    Candle.
Answer
Correct option: B.
Charcoal.
Charcoal glows red and burns without a flame.
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MCQ 421 Mark
The number of covalent bonds in pentane $($molecular formula $\ce{C_5H_{12}})$ is:
  • A
    $5$
  • B
    $12$
  • C
    $17$
  • ✓
    $16$
Answer
Correct option: D.
$16$
The number of covalent bonds in pentane is $16.$
This is clear from the structure of pentane shown below:
$ \ \ \ \ \ \ \ \ \text{H} \ \ \ \ \ \text{H}\ \ \ \ \text{H}\ \ \ \ \ \text{H}\ \ \ \ \ \text{H}\\ \ \ \ \ \ \ \ \ \ \text{|}\ \ \ \ \ \ \ \text{|}\ \ \ \ \ \ \text{|}\ \ \ \ \ \ \text{|}\ \ \ \ \ \ \ \text{|}\\ \text{H}-\text{C}-\text{C}-\text{C}-\text{C}-\text{C}-\text{H}\\ \ \ \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \text{|} \ \ \ \ \ \ \ \ \text{|}\\ \ \ \ \ \ \ \ \ \text{H} \ \ \ \ \ \text{H} \ \ \ \ \ \text{H} \ \ \ \ \text{H} \ \ \ \ \ \ \text{H}$
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MCQ 431 Mark
When ethanol is heated with alkaline potassium permanganate solution, it gets converted into ethanoic acid. In this reaction, alkaline potassium permanganate acts as:
  • A
    Reducing agent.
  • ✓
    Oxidising agent.
  • C
    Catalyst.
  • D
    Dehydrating agent.
Answer
Correct option: B.
Oxidising agent.
Alkaline potassium permanganate solution is an aqueous solution of potassium permanganate. It acts as an oxidising agent by providing oxygen, and converts ethanol to ethanoic acid.
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MCQ 441 Mark
One of the following molecular formula can represent two organic compounds having different functional groups. This molecular formula is:
  • A
    $\ce{C_5H_{12}O}$
  • ✓
    $\ce{C_5H_{10}O}$
  • C
    $\ce{C_5H_{10}O_2}$
  • D
    $\ce{C_5H_{12}}$
Answer
Correct option: B.
$\ce{C_5H_{10}O}$
$\ce{C_5H_{10}O}$ represents two organic compounds ketones $\ce{(C_2H_5-CO-C_2H_5)}$ and aldehydes $\ce{(C_2H_5-CH_2-CH_2-CHO)}$ which have different functional groups.
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MCQ 451 Mark
The functional group which always occurs in the middle of a carbon chain is:
  • A
    Alcohol group.
  • B
    Aldehyde group.
  • C
    Carboxyl group.
  • ✓
    Ketone group.
Answer
Correct option: D.
Ketone group.
The ketone group (-CO-), with the general formula R-CO-R, is always present in the middle of a carbon chain.
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MCQ 461 Mark
A saturated hydrocarbon has fifty hydrogen atom in its molecule. The number of carbon atoms in its molecule will be:
  • A
    Twenty five.
  • ✓
    Twenty four.
  • C
    Twenty six.
  • D
    Twenty seven.
Answer
Correct option: B.
Twenty four.
Alkanes are saturated hydrocarbons that have the general formula $\ce{C_nH_{2n+2.}}$ According to the question, the number of hydrogen atoms is $50$,
i.e., $2n + 2 = 50.$
$\therefore \text{n}=\frac{48}{2}=24$
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MCQ 471 Mark
One of the following molecular formulae represents a ketone. This formula is:
  • A
    $\ce{C_5H_{12}O}$
  • B
    $\ce{C_6H_{12}O_2}$
  • C
    $\ce{C_6H_{14}O}$
  • ✓
    $\ce{C_6H_{12}O}$
Answer
Correct option: D.
$\ce{C_6H_{12}O}$
$\ce{C_6H_{12}O} ($hexanone or $\ce{C_2H_5-CO-C_3H_7})$ represents a ketone.
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MCQ 481 Mark
The soap molecule has a:
  • ✓
    Hydrophilic head and a hydrophobic tail.
  • B
    Hydrophobic head and a hydrophilic tail.
  • C
    Hydrophobic head and a hydrophobic tail.
  • D
    Hydrophilic head and a hydrophilic tail.
Answer
Correct option: A.
Hydrophilic head and a hydrophobic tail.
The soap molecule has a hydrophilic head and a hydrophobic tail.
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MCQ 491 Mark
The molecular formula of the third member of the homologous series of ketones is:
  • A
    $\ce{C_4H_8O}$
  • B
    $\ce{C_3H_6O}$
  • ✓
    $\ce{C_5H_{10}O}$
  • D
    $\ce{C_6H_{12}O}$
Answer
Correct option: C.
$\ce{C_5H_{10}O}$
The molecular formula of the third member from the homologous series of ketones is $\ce{C_5H_{10}O}$ $($Pentanone or $\ce{C_2H_5-CO-C_2H_5).}$
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MCQ 501 Mark
The usual disease caused by the excessive drinking of alcohol over a long period of time is:
  • A
    Diabetes.
  • B
    Cataract.
  • ✓
    Cirrhosis.
  • D
    Arthritis.
Answer
Correct option: C.
Cirrhosis.
Cirrhosis is the liver disease caused by the excessive consumption of alcohol over a prolonged period.
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