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Science M.C.Q

Carbon and its Compounds · CBSE STD 10 (CBSE - English Medium). 28 questions.

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28 questions · timed · auto-graded

MCQ 11 Mark
Which of the following are correct structural isomers of butane?
  • A
    $1$ and $3$
  • B
    $2$ and $4$
  • ✓
    $1$ and $2$
  • D
    $3$ and $4$
Answer
Correct option: C.
$1$ and $2$
Formula of butane is $C_4H_{10}$. Options $(iii)$ and $(iv)$ have $8$ hydrogen atoms each, hence, they are incorrect.
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MCQ 21 Mark
$\text{CH}_3\text{CH}_2\text{OH}\xrightarrow[\text{Heat}]{\text{Alkaline KMnO}_4}\text{CH}_3\text{COOH}$In the above given reaction, alkaline $KMnO_4$ acts as:
  • A
    Reducing agent.
  • ✓
    Oxidising agent.
  • C
    Catalyst.
  • D
    Dehydrating agent.
Answer
Correct option: B.
Oxidising agent.
Alkaline $KMnO_4$ is also known as Baeyer’s reagent. It acts as an oxidizing agent.
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MCQ 31 Mark
The name of the compound $\text{CH}_3-\text{CH}_2-\text{CHO}$ is:
  • ✓
    Propanal.
  • B
    Propanone.
  • C
    Ethanol.
  • D
    Ethanal.
Answer
Correct option: A.
Propanal.

Compound contains three carbon atoms so prop-would be root word and – CHO functional group so suffix will be – al. Hence name would be propane + al = propanal.

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MCQ 41 Mark
In the soap micelles:
  • ✓
    The ionic end of soap is on the surface of the cluster while the carbon chain is in the interior of the cluster.
  • B
    Ionic end of soap is in the interior of the cluster and the carbon chain is out of the cluster.
  • C
    Both ionic end and carbon chain are in the interior of the cluster.
  • D
    Both ionic end and carbon chain are on the exterior of the cluster.
Answer
Correct option: A.
The ionic end of soap is on the surface of the cluster while the carbon chain is in the interior of the cluster.
The ionic end of soap is on the surface of the cluster while the carbon chain is in the interior of the cluster.
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MCQ 51 Mark
The heteroatoms present in $\text{CH}_3-\text{CH}_2-\text{O}-\text{CH}_2-\text{CH}_2\text{Cl}$ are :
  1. Oxygen.
  2. Carbon.
  3. Hydrogen.
  4. Chlorine.
  • A
    $1$ and $2$
  • B
    $2$ and $3$
  • C
    $3$ and $4$
  • ✓
    $1$ and $4$
Answer
Correct option: D.
$1$ and $4$
Oxygen and chlorine are not among essential components of hydrocarbons.
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MCQ 61 Mark
Structural formula of benzene is:
  • A
  • B
  • ✓
  • D
Answer
Correct option: C.

Benzene is simplest aromatic compound with six carbon atoms and six H atoms. There are three alternate pi bonds in ring of carbon atoms.
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MCQ 71 Mark
Vinegar is a solution of:
  • A
    50% – 60% acetic acid in alcohol.
  • B
    5% – 8% acetic acid in alcohol.
  • ✓
    5% – 8% acetic acid in water.
  • D
    50% – 60% acetic acid in water.
Answer
Correct option: C.
5% – 8% acetic acid in water.
Vinegar is a 5% - 8% aqueous solution of acetic acid.
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MCQ 81 Mark
The first member of alkyne homologous series is:
  • ✓
    Ethyne.
  • B
    Ethene.
  • C
    Propyne.
  • D
    Methane.
Answer
Correct option: A.
Ethyne.

 Alkyne is an organic compound with triple covalent bond between two carbon atoms therefore first member of homologous series must have atleast two carbon atoms with one triple bond that is ethyne (CH ≡ CH).

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MCQ 91 Mark
Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g. hydrogen. After the formation of four bonds, carbon attains the electronic configuration of:
  • A
    Helium.
  • ✓
    Neon.
  • C
    Argon.
  • D
    Krypton.
Answer
Correct option: B.
Neon.

The compound formed is methane $(CH_4)$. In this, carbon atom has a complete octet and configuration of neon which is a noble gas element.

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MCQ 101 Mark
Chlorine reacts with saturated hydrocarbons at room temperature in the:
  • A
    Absence of sunlight.
  • ✓
    Presence of sunlight.
  • C
    Presence of water.
  • D
    Presence of hydrochloric acid.
Answer
Correct option: B.
Presence of sunlight.

These reactions are called photochemical reactions.

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MCQ 111 Mark
In which of the following compounds, -OH is the functional group?
  • A
    Butanone.
  • ✓
    Butanol.
  • C
    Butanoic acid.
  • D
    Butanal.
Answer
Correct option: B.
Butanol.

 -OH is the functional group in butanol which is an alcohol.

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MCQ 121 Mark
Which of the following is not a straight chain hydrocarbon?
  • A
    $\text{H}_3\text{C}-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
  • B
    $\text{H}_3\text{C}-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_2-\text{CH}_3$
  • C
    $\ \ \ \ \ \text{CH}_3\\ \ \ \ \ \ \ |\\\text{H}_2\text{C}-\text{H}_2\text{C}-\text{H}_2\text{C}-\text{CH}_2\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
  • ✓
Answer
Correct option: D.

A branched chain hydrocarbon must contain some side chains which are bonded with parent carbon chain.
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MCQ 131 Mark
Which of the following statements are usually correct for carbon compounds? These :
  1. Are good conductors of electricity.
  2. Are poor conductors of electricity.
  3. Have strong forces of attraction between their molecules.
  4. Do not have strong forces of attraction between their molecules.
  • A
    $1$ and $3$
  • B
    $2$ and $3$
  • C
    $1$ and $4$
  • ✓
    $2$ and $4$
Answer
Correct option: D.
$2$ and $4$
Organic compound are made of covalent bonds. These bonds have weaker forces of attraction. Covalent compounds are poor conductors of electricity.
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MCQ 141 Mark
Carbon exists in the atmosphere in the form of:
  • A
    Carbon monoxide only.
  • ✓
    Carbon monoxide in traces and carbon dioxide.
  • C
    Carbon dioxide only.
  • D
    Coal.
Answer
Correct option: B.
Carbon monoxide in traces and carbon dioxide.

 Both $CO$ and $CO_2$​​​​​​​ gases are present in traces in the atmosphere.

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MCQ 151 Mark
Mineral acids are stronger acids than carboxylic acids because:
  1. Mineral acids are completely ionised.
  2. Carboxylic acids are completely ionised.
  3. Mineral acids are partially ionised.
  4. Carboxylic acids are partially ionised.
  • ✓
    $1$ and $4$
  • B
    $2$ and $3$
  • C
    $1$ and $2$
  • D
    $3$ and $4$
Answer
Correct option: A.
$1$ and $4$
Mineral acids like $\ce{HCl}$ are completely ionized in solvent like water whereas carboxylic acids such as $\ce{CH_3COOH}$ are only partially ionized.
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MCQ 161 Mark
Ethanol reacts with sodium and forms two products. These are:
  • A
    Sodium ethanoate and hydrogen.
  • B
    Sodium ethanoate and oxygen.
  • ✓
    Sodium ethoxide and hydrogen.
  • D
    Sodium ethoxide and oxygen.
Answer
Correct option: C.
Sodium ethoxide and hydrogen.
$2\text{C}_2\text{H}_5\text{OH}+2\text{Na}\rightarrow2\text{C}_2\text{H}_5\text{ONa + H}_2\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Sod.ethoxide}$​​​​​​​
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MCQ 171 Mark
A molecule of ammonia $(NH_3)$ has:
  • ✓
    Only single bonds.
  • B
    Only double bonds.
  • C
    Only triple bonds.
  • D
    Two double bonds and one single bond.
Answer
Correct option: A.
Only single bonds.

Ammonia is a covalent molecule in which center nitrogen atom is bonded with three hydrogen atoms through single covalent bond.

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MCQ 181 Mark
Identify the unsaturated compounds from the following :
  1. Propane.
  2. Propene.
  3. Propyne.
  4. Chloropropane.
  • A
    $1$ and $2$
  • B
    $2$ and $4$
  • C
    $3$ and $4$
  • ✓
    $2$ and $3$
Answer
Correct option: D.
$2$ and $3$
Both propene and propyne are unsaturated hydrocarbons.
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MCQ 191 Mark
The correct electron dot structure of a water molecule is:
  • A
  • B
  • ✓
  • D
Answer
Correct option: C.

 This dot structure shows a complete octet after oxygen shared two electrons with two univalent atoms of hydrogen.

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MCQ 201 Mark
Which among the following are unsaturated hydrocarbons?
  1. $\text{H}_3\text{C}-\text{CH}_2-\text{CH}_2-\text{CH}_3$
  2. $\text{H}_3\text{C}-\text{C}\equiv\text{C}-\text{CH}_3$
  3. $\ \text{H}_3\text{C}-\text{CH}-\text{CH}_3\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \ \ \ \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
  4. $\ \text{H}_3\text{C}-\text{C}=\text{CH}_2\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ | \ \ \ \\ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{CH}_3$
  • A
    $1$ and $3$
  • B
    $2$ and $3$
  • ✓
    $2$ and $4$
  • D
    $3$ and $4$
Answer
Correct option: C.
$2$ and $4$
These compounds show double and triple bonds. Hence they are unsaturated hydrocarbons.
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MCQ 211 Mark

Which of the following is the correct representation of electron dot structure of nitrogen?



 
  • A
  • B
  • C
  • ✓
Answer
Correct option: D.

Explanation: In this structure, each nitrogen atom gets 8 electrons. This is not in the case of other options.
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MCQ 221 Mark
Buckminsterfullerene is an allotropic form of:
  • A
    Phosphorus.
  • B
    Sulphur.
  • ✓
    Carbon.
  • D
    Tin.
Answer
Correct option: C.
Carbon.
Explanation: Buckminsterfullerene is an allotrope of carbon with 60 carbon atoms which are joined together in a spherical shape.
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MCQ 231 Mark
Which of the following does not belong to the same homologous series?
  • A
    $CH_4$
  • B
    $C_2H_6$
  • C
    $C_3H_8$
  • ✓
    $C_4H_8$
Answer
Correct option: D.
$C_4H_8$
Successive members of same homologous series are differ by $ - CH_2$ unit. $CH_4, C_2H_6, C_3H_8$ belong to same series that is of alkane and differ by $─ CH_2$ unit but $C_4H_8$ does not belong to this.
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MCQ 241 Mark
Oils on treating with hydrogen in the presence of palladium or nickel catalyst form fats. This is an example of:
  • ✓
    Addition reaction.
  • B
    Substitution reaction.
  • C
    Displacement reaction.
  • D
    Oxidation reaction.
Answer
Correct option: A.
Addition reaction.
Explanation: It is hydrogenation reaction means addition of hydrogen to double bonds of unsaturated compounds found in oil.
$\text{CH}_3\text{COOH}_2\text{CH}_3\ +\ \text{NaOH}\xrightarrow[\text{(Sapon ification)}]{\text{Heat}}\text{CH}_3\text{COONa}+\text{CH}_3\text{CH}_2\text{OH}\\ \ \text{Ethyl ethanoate}\ \ \ \ \ \ \ \text{Sodium}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Sodium}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Ethanol}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{hydroxide}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{ethanoate}$
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MCQ 251 Mark
Structural formula of ethyne is:
  • ✓
    $\text{H}-\text{C}\equiv\text{C}-\text{H}$
  • B
    $\text{H}_3-\text{C}\equiv\text{C}-\text{H}$
  • C
  • D
Answer
Correct option: A.
$\text{H}-\text{C}\equiv\text{C}-\text{H}$

General formula for alkyne is $C_nH_{2n-2}$. There must be at least one triple bond between carbon atoms. With two carbon atom, the possible structure would be $\text{H}-\text{C}\equiv\text{C}-\text{H}.$

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MCQ 261 Mark
Pentane has the molecular formula $C_5H_{12}$. It has:
  • A
    $5$ covalent bonds.
  • B
    $12$ covalent bonds.
  • ✓
    $16$ covalent bonds.
  • D
    $17$ covalent bonds.
Answer
Correct option: C.
$16$ covalent bonds.

Pentane contains four $C - C$ bonds and twelve $C - H$ covalent bonds.

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MCQ 271 Mark
Which of the following represents saponification reaction?
  • A
    $\text{CH}_3\text{COOHNa}+\text{NaOH}\xrightarrow{\text{CaO}}\text{CH}_4+\text{Na}_2\text{CO}_3$
  • B
    $2\text{CH}_3\text{COOH}+\text{C}_2\text{H}_5\text{OH}\xrightarrow{\text{H}_2\text{SO}_4}\text{CH}_3\text{COOC}_2\text{H}_5+\text{H}_2\text{O}$
  • C
    $2CH_3COOH + 2Na \rightarrow 2CH_3COONa + H_2$
  • ✓
    $CH_3COOC_2H_5 + NaOH \rightarrow CH_3COONa + C_2H_5OH$
Answer
Correct option: D.
$CH_3COOC_2H_5 + NaOH \rightarrow CH_3COONa + C_2H_5OH$

 Saponification reaction is reaction of ester with base like $\text{NaOH}$ to form the parent alcohol and sodium salt of carboxylic acid.

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MCQ 281 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.
 Oil and grease is trapped inside a micelle because of hydrophobic tail. Hydrophilic head makes the outer surface of micelle. Thus, a micelle is easily washed by water.
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