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Science MCQ (1 Marks)

Acids, Bases and Salts · Bihar Board (BSEB) STD 7 (BSEB - English Medium). 182 questions.

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MCQ (1 Marks)

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MCQ 11 Mark
Neutralization Reaction Is :
  • A
    Physical and reversible change.
  • B
    Physical change that cannot be reversed.
  • C
    Chemical and reversible change.
  • ✓
    Chemical change that cannot be reversed.
Answer
Correct option: D.
Chemical change that cannot be reversed.
Neutralization reaction is a chemical reaction between acid and base to produce salt and water. It cannot be reversed.
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MCQ 21 Mark
Which Of The Following Statement$(S)$ Is Or Are Correct?
  • A
    Lemon water is basic in nature.
  • B
    A compound if acidic will turn all indicators red.
  • C
    Common salt dissolved in water turns blue litmus red.
  • ✓
    None of the above.
Answer
Correct option: D.
None of the above.
Lemon water is acidic in nature. Acids do not turn all indicators red $e.g.$ china rose indicator turns to dark pink $($magenta$)$ when acidic compound is added to it. Common salt and water both are neutral. Hence, have no effect on litmus.
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MCQ 31 Mark
Products of a neutralisation reaction are always:
  • A
    An acid and a base.
  • B
    An acid and a salt.
  • ✓
    A salt and water.
  • D
    A salt and a base.
Answer
Correct option: C.
A salt and water.
Acid and base participate in neutralisation reaction and produce salt and water.
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MCQ 41 Mark
A solution of methyl amine:
  • A
    Turns blue litmus red
  • ✓
    Turns red litmus blue
  • C
    Does not affect red or blue litmus
  • D
    Bleaches litmus
Answer
Correct option: B.
Turns red litmus blue
Methylamine is basic in nature. When it is tested with litmus paper, the red litmus turns blue, and the blue litmus remains unaffected. It does not have any bleaching effect on the litmus paper.
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MCQ 51 Mark
China rose indicator turns acidic solution to:
  • ✓
    Magenta
  • B
    Light blue
  • C
    Green
  • D
    Yellow
Answer
Correct option: A.
Magenta
China rose is a red$-$colored natural indicator that turns the acidic solution into a magenta color or dark pink.
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MCQ 61 Mark
Give the chemical name of Window cleaner.
  • A
    Calcium hydroxide.
  • B
    Magnesium hydroxide.
  • ✓
    Ammonium hydroxide.
  • D
    Sodium hydroxide.
Answer
Correct option: C.
Ammonium hydroxide.
Ammonium hydroxide.
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MCQ 71 Mark
Indigestion is caused by:
  • A
    Too much basicity
  • ✓
    Too much acidity
  • C
    Neutral environment
  • D
    None of these
Answer
Correct option: B.
Too much acidity
Too much acid in the stomach causes indigestion. It is painful sometimes.
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MCQ 91 Mark
Which of the following set of substances contain acids only?
  • A
    Grapes, lime water
  • B
    Vinegar, soap
  • C
    Curd, milk of magnesia
  • ✓
    Curd, vinegar
Answer
Correct option: D.
Curd, vinegar
Curd contains lactic acid and vinegar contains acetic acid. Lime water, soap, and milk of magnesia are basic substances and grapes contain tartaric acid.
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MCQ 101 Mark
Which solution is a conjugate acid$/$base pair with differing spectral absorbencies?
  • ✓
    Chemical $pH$ indicator
  • B
    Acid$/$ base buffer
  • C
    Hypotonic solution
  • D
    Supersaturated solution
Answer
Correct option: A.
Chemical $pH$ indicator
Chemical $pH$ indicator is a conjugate acid$/$base pair with differing spectral absorbencies.
It is used to indicate the endpoint of the titration.
For example, phenolphthalein is colourless in acid solution and pink in colour in alkaline solution.
Also, litmus is red in acid solution and blue in alkaline solution.
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MCQ 111 Mark
The products of neutralisation reactions are:
  • ✓
    Salt and water
  • B
    Acid and base
  • C
    Base and salt
  • D
    Acid and water
Answer
Correct option: A.
Salt and water
In neutralisation reaction acid and base react to give salt and water.
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MCQ 121 Mark
Acid present in cold drinks $($soft drinks$)$ is:
  • ✓
    Carbonic acid
  • B
    Citric acid
  • C
    Tartaric acid
  • D
    Sulphuric acid
Answer
Correct option: A.
Carbonic acid
Carbonic acid is added to soft drinks to make it fizzy. When the bottle is opened, the pressure decreases and the carbonic acid changes into carbon dioxide and water making it fizzy.
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MCQ 131 Mark
The correct way of making a solution of acid in water is to:
  • A
    Add water to acid.
  • ✓
    Add acid to water.
  • C
    Mix acid and water simultaneously.
  • D
    Add water to acid in a shallow container.
Answer
Correct option: B.
Add acid to water.
Making solution of acid and water evolve heat. Acid should be added to water drop wise.
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MCQ 141 Mark
Antacids contain $........$
  • ✓
    Weak base
  • B
    Weak acid
  • C
    Strong base
  • D
    Strong acid
Answer
Correct option: A.
Weak base
Antacids are consumed when a person suffers from acidity $($excessive acid secretion$),$ antacids are composed of weak bases so that they neutralize excess of acid. Strong bases are not used because they are corrosive to body tissue.
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MCQ 151 Mark
Which of the following is a strong acid?
  • A
    Acetic acid.
  • ✓
    Nitric acid.
  • C
    Lactic acid.
  • D
    Citric acid.
Answer
Correct option: B.
Nitric acid.
Nitric acid.
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MCQ 161 Mark
An oxide is acidic and has a pungent odour. It could be:
  • A
    Sulphur dioxide
  • B
    Carbon dioxide
  • C
    Sodium oxide
  • ✓
    Nitrogen dioxide
Answer
Correct option: D.
Nitrogen dioxide
Nitrogen dioxide is non$-$metallic oxide hence it is acidic in nature and it has a pungent odour.
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MCQ 171 Mark
Which of the following turns red litmus blue ?
  • ✓
    Bases
  • B
    Acids
  • C
    Salts
  • D
    None of these
Answer
Correct option: A.
Bases
Base turns red litmus blue.
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MCQ 181 Mark
Which one will change from red litmus to blue$?$
  • A
    $NaCl$
  • B
    $HCl$
  • ✓
    $KOH$
  • D
    $LiOH$
Answer
Correct option: C.
$KOH$

 for correct option:
In basic (or alkaline) solution, red litmus turns blue.
$C:$ Since $KOH$ is a strong base thus, it will turn red litmus blue.
$D: LiOH$ is a strong base and thus, it will turn red litmus blue.

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MCQ 191 Mark
Aqueous solution of a base:
  • A
    Turns blue litmus into red
  • ✓
    Turns red litmus into blue
  • C
    Turns litmus solution colourless
  • D
    Has no effect on litmus solutio
Answer
Correct option: B.
Turns red litmus into blue
Red litmus contains a weak diprotic acid. When it is exposed to a basic compound, the hydrogen ions react with the added base. The conjugate base formed from the litmus acid has a blue color, so the wet red litmus paper turns blue in an alkaline solution.
Bases turn the color of red litmus paper to blue.
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MCQ 201 Mark
Manisha took a little bit of soil from her garden and mixed it with water. When she dipped a blue litmus in it, the litmus turned red. By adding which of the following to her garden will she get better plant growth?
  • A
    Hydrochloric acid
  • ✓
    Slaked lime
  • C
    Water
  • D
    Salt
Answer
Correct option: B.
Slaked lime
When she dipped a blue litmus in it, the litmus turned red so the soil is acidic in nature. Slaked lime is applied to acidic soils to regulate the soil's $pH$ levels.
Plants grow best in neutral soil therefore a base must be added.
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MCQ 221 Mark
Litmus paper $($purple colour$)$ in distilled water when added to an acid changes to:
  • ✓
    Red.
  • B
    Blue.
  • C
    Green.
  • D
    Violet.
Answer
Correct option: A.
Red.
Red.
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MCQ 231 Mark
Which of the following sets of substances contains acids?
  • A
    Grapes, lime water
  • B
    Vinegar, soap
  • C
    Curd, milk of magnesia
  • ✓
    Curd, vinegar
Answer
Correct option: D.
Curd, vinegar
Curd contains lactic acid and vinegar contains acetic acid. Lime water, soap and milk of magnesia are basic substances and grapes contains tartaric acid.
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MCQ 241 Mark
An alkali used for removing grease stains is:
  • A
    $HCl$
  • B
    $Al(OH​)_3$
  • ✓
    $NH​_4OH$
  • D
    $Na_2​SO_4$
Answer
Correct option: C.
$NH​_4OH$
C.  $NH​_4OH$
Explanation:
Ammonium hydroxide is a moderately strong alkali cleaner to clean windows,ovens,greasy stains. It has very strong irritating fumes.
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MCQ 251 Mark
When $CO_2$ gas is passed through lime water, it turns milky. Which of the following compounds is responsible for this milkiness?
  • A
    Calcium oxide
  • B
    Calcium chloride
  • C
    Sodium carbonate
  • ✓
    Calcium carbonate
Answer
Correct option: D.
Calcium carbonate
Lime water is calcium hydroxide and when carbon dioxide is passed it reacts with calcium hydroxide to form calcium carbonate which turns lime water milky.
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MCQ 261 Mark
Acids and bases react to produce:
  • A
    Salt and acid
  • ✓
    Salt and water
  • C
    Salt and hydrogen gas
  • D
    None of these
Answer
Correct option: B.
Salt and water
Acid and bases react to produce salt and water.
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MCQ 271 Mark
Which of the following acid is present naturally in the spinach?
  • ✓
    Oxalic acid
  • B
    Succinic acid
  • C
    Tartaric acid
  • D
    Citrus acid
Answer
Correct option: A.
Oxalic acid
In tomatoes, the acid present naturally is oxalic acid.
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MCQ 281 Mark
One of the following that does not inject an acidic liquid into the skin through its sting. This is:
  • A
    Honey bee
  • B
    Ant
  • ✓
    Wasp
  • D
    Nettle leaf hair
Answer
Correct option: C.
Wasp
A honey bee, ant and a nettle leaf hair inject methanoic acid into the skin through their stings. But a wasp injects an alkaline solution into the skin through its sting.
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MCQ 291 Mark
The chemical name of "Oil of Vitriol" is:
  • A
    Nitric acid
  • B
    Hydrochloric acid
  • C
    Potassium hydroxide
  • ✓
    Sulphuric acid
Answer
Correct option: D.
Sulphuric acid
Sulphuric acid was first discovered by the liquefaction of green vitriol $\ce{(FeSO_4​}. \ce{7H_2O)}.$ Hence, it is called the oil of vitriol.
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MCQ 301 Mark
Products of a neutralisation reaction are always:
  • A
    An acid and a base
  • ✓
    An acid and a salt
  • C
    A salt and water
  • D
    A salt and a base
Answer
Correct option: B.
An acid and a salt
When we add water to acid, it releases some amount of energy. We can feel this energy by touching the surface of the test tube. Sometimes, released heat is too huge, because of this glasses of test tube may break down and acid can split over. So, in practice, you have to take an excessive amount of water and mix acid drop by drop. In this way, heat generated can be cooled down by this water and mistakes can be prevented.
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MCQ 311 Mark
The acidic behaviour of lakes and oceans can be neutralized by:
  • A
    $NaOH$
  • B
    $HCl$
  • ✓
    $CaCO_3$
  • D
    $Ca(OH)_2​$
Answer
Correct option: C.
$CaCO_3$
C.  $CaCO_3$
Explanation:
Lakes and oceans can become acidic due to acid rain. This increases the acidity of such bodies and affects the aquatic life. To neutralize this acidic behavior of lakes and oceans, calcium carbonate ($CaCO_3$​) is used.
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MCQ 321 Mark
In Which Of The Following Statement Is Or Are Correct?
  • A
    Indigestion is neutralized by taking an antacid like milk of magnesia.
  • B
    The effect of and sting is neutralized by rubbing most baking soda.
  • C
    Soil can be treated with quicklime when soil is too acidic.
  • ✓
    All the above.
Answer
Correct option: D.
All the above.
All the above.
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MCQ 331 Mark
An example of a solution which is not in equilibrium is:
  • A
    Chemical pH indicator
  • B
    Acid/ base buffer
  • C
    Hypotonic solution
  • ✓
    Supersaturated solution
Answer
Correct option: D.
Supersaturated solution
d.    Supersaturated solution
Explanation:
In a supersaturated solution, the amount of solute in the solvent is greater than the amount that solvent can dissolve. equilibrium exists when the dissolution and crystallization continue as long as excess solute is present which is analogous to vapor pressure which happens only in a saturated solution.
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MCQ 341 Mark
The reaction in which an acid react with a base to form salt and water is called as:
  • A
    Addition reaction
  • B
    Displacement reaction
  • ✓
    Neutralisation reaction
  • D
    Substitution reaction
Answer
Correct option: C.
Neutralisation reaction
The reaction between acid and base produces salt and water, which is the example of neutralization reaction.
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MCQ 351 Mark
Consider The Following Statements, Choose The Correct One:
  • A
    Both acids and bases change colour of all indicators.
  • B
    If an indicator gives a colour change with an acid it does not give a change with a base.
  • C
    If an indicator changes colour with a base but does not change colour with an acid.
  • ✓
    Change of colour in an acid and a base depends on the type of indicators.
Answer
Correct option: D.
Change of colour in an acid and a base depends on the type of indicators.
As an example, to understand: methyl orange and phenolphthalein used as indicator. In acidic solution, methyl orange gives red colour but in basic solution it gives yellow colour. In acidic solution, phenolphthalein is colourless but in basic it gives pink colour. Thus, the change of colour in acid and a base depends on the type of indicators.
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MCQ 361 Mark
The effect of sting of an ant can be neutralised by rubbing with.
  • A
    Calcium carbonate.
  • B
    Sodium Carbonate.
  • ✓
    Sodium hydrogen carbonate.
  • D
    Calcium chloride.
Answer
Correct option: C.
Sodium hydrogen carbonate.
Sodium hydrogen carbonate.
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MCQ 371 Mark
Consider The Following Statements And Choose The Incorrect Statement$(S):$
  • A
    China rose indicator is a light pink coloured solution which is extracted from the red flowers of china rose plant with water.
  • B
    Acid turns china rose indicator to magenta (deep pink).
  • ✓
    Bases turn china rose indicator to blue.
  • D
    If a drop of the given solution turns china rose indicator from light pink to green, then the given solution will be basic in nature.
Answer
Correct option: C.
Bases turn china rose indicator to blue.
Bases turn china rose indicator to blue.
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MCQ 381 Mark
Which of the following is a use of sodium hydroxide?
  • A
    It is used in the manufacture of soaps and paper.
  • B
    It is used in the manufacture of synthetic fibers like rayon.
  • C
    It is an important constituent of drain cleaners.
  • ✓
    All of the above.
Answer
Correct option: D.
All of the above.
Sodium hydroxide is used in the manufacture of soaps, paper; in the manufacture of synthetic fibers like rayon and is important constituent in drain cleaners.
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MCQ 391 Mark
When the soil is too basic, plants do not grow well in it. To improve its quality, what must be added to the soil?
  • ✓
    Organic matter.
  • B
    Quicklime.
  • C
    Slaked lime.
  • D
    Calamine solution.
Answer
Correct option: A.
Organic matter.
Organic matter $($called manure or compost$)$ releases acids which neutralise the excess bases present in the soil and reduce its basic nature.
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MCQ 401 Mark
Magnesium hydroxide is found in:
  • A
    Soap
  • B
    Lime water
  • ✓
    Milk of magnesia
  • D
    Vegetable
Answer
Correct option: C.
Milk of magnesia

 Magnesium hydroxide is an ingredient in $OTC$ products, such as Milk of Magnesia. It also draws water into the intestines to help soften stool and encourage a bowel movement.

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MCQ 411 Mark
Which of the following is not an indicator?
  • A
    Litmus
  • B
    Phenolphthalein
  • C
    Turmeric
  • ✓
    None of these
Answer
Correct option: D.
None of these
None of these
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MCQ 421 Mark
A teacher gave two test tubes, one containing water and the other containing sodium hydroxide solution, to the students and asked them to identify the test tube containing sodium hydroxide solution. Which one of the following can be used for correctly identifying the test tube containing sodium hydroxide solution?
  • A
    Blue litmus paper
  • ✓
    Red litmus paper
  • C
    Sodium carbonate solution
  • D
    Dilute hydrochloric acid
Answer
Correct option: B.
Red litmus paper
Red litmus paper will turn blue when it is dipped in a basic solution. So, the student can use red litmus paper to identify the test tube containing sodium hydroxide solution, which is basic.
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MCQ 431 Mark
Choose the odd one:
  • ✓
    Ammonium hydroxide
  • B
    Tartaric acid
  • C
    Ascorbic acid
  • D
    Formic acid
Answer
Correct option: A.
Ammonium hydroxide
Except ammonium hydroxide, rest all are bases.
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MCQ 441 Mark
Which of the following colours is given by phenolphthalein in a basic salt solution:
  • A
    Yellow.
  • ✓
    Pink.
  • C
    Orange red.
  • D
    Colourless.
Answer
Correct option: B.
Pink.
Pink.
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MCQ 451 Mark
Which of the following base is used for cleaning and commonly known as lye?
  • A
    $Ca(OH)_2$​
  • ✓
    $NaOH$
  • C
    $KOH$
  • D
    All of the above
Answer
Correct option: B.
$NaOH$
 A common base used for cleaning is sodium hydroxide, known commonly as lye or caustic soda. It is not to be taken internally, because it is highly damaging to humans tissue particularly the eyes. Lye appears in drain cleaners, such as Drano, and oven cleaners, such as Easy-Off, which make use of its ability to convert fats to water-soluble soap.
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MCQ 461 Mark
Which of the following base is used as antacid to neutralize stomach acidity?
  • ✓
    $Mg(OH)​_2$
  • B
    $KOH$
  • C
    $Ca(OH)_2​$
  • D
    $NaOH$
Answer
Correct option: A.
$Mg(OH)​_2$
A.  $Mg(OH)​_2$
Explanation:
Magnesium hydroxide is also known as milk of magnesia and it is a common component of antacids and laxatives. It interferes with the absorption of folic acid and iron. It carries away much of the body's supply of potassium and neutralizes the stomach acid.
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MCQ 471 Mark
Distilled water is:
  • A
    Acidic
  • B
    Basic
  • ✓
    Neutral
  • D
    None of these
Answer
Correct option: C.
Neutral
Distilled water is neutral in character$, i.e.$ it is neither acidic nor basic. Neutral nature of distilled water can be verified by the use of blue and red litmus paper.
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MCQ 481 Mark
On adding phenolphthalein indicator to a colourless solution, no change is observed. What is the nature of this solution?
  • A
    Basic
  • B
    Either acidic or basic
  • ✓
    Either acidic or neutral
  • D
    Either basic or neutral
Answer
Correct option: C.
Either acidic or neutral
Explanation: Phenolphthalein gives pink colour in basic solution. It remains colourless in acidic or neutral solution.
Conclusion: Phenolphthalein only gives colour in basic medium.
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MCQ 491 Mark
Which of the following statements are correct?
  • A
    Acid turns blue litmus red.
  • B
    Base turns red litmus blue.
  • ✓
    Both $A$ and $B$ correct
  • D
    Water changes the colour of red litmus.
Answer
Correct option: C.
Both $A$ and $B$ correct

An acidic solution turns blue litmus red. On the $pH$ scale, acids have values less than $7.$
A basic solution turns red litmus blue. On the $pH$ scale, bases have values more than $7.$
Water is neither acidic nor basic, which means it is neutral. So, it can not change the color of litmus paper. The $pH$ value for water is equal to $7.$

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