Acids Bases and Salts Class 10 Science MCQ Questions

Acids Bases and Salts Class 10 is increasing the preparation level of students. so they can attempt the board exams.

Q 1 – An aqueous solution ‘A’ turns phenolphthalein solution pink. On addition of an aqueous solution `B’ to ‘N, the pink colour disappears. The following statement is true for solution ‘A and ’13’.

(A) A is strongly basic and B is a weak base.

(B) A is strongly acidic and B is a weak acid.

(C) A has pH greater than 7 and B has pH less than 7.

(D) A has pH less than 7 and B has pH greater than 7.

Answer.

Q 2 – Identify the basic salt from the following salts:

(A) Na₂CO3

(B) NH₄C1

(C) NaNO₃

(D) KCI

Answer.

Q 3 – Which one of the following can be used as an acid-base indicator by a visually impaired student?

(A) Litmus

(B) Turmeric

(C) Vanilla essence

(D) Petunia leaves

Answer.

Q 4 – Which of the following is acidic in nature?

(A) Lime juice

(B) Human blood

(C) Lime water

(D) Antacid

Answer.

Q 5 – During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the guard tube containing calcium chloride. The role of calcium chloride taken in the guard tube is to

(A) absorb the evolved gas.

(B) moisten the gas.

(C) absorb moisture from the gas.

(D) absorb Cr ions from the evolved gas.

Answer.

Q 6 – Which of the following are present in a dilute aqueous solution of hydrochloric acid?

(A) H₃0⁺ + C1^–

(B) H₃0⁺ + OH^–

(C) Cl^– + OH

(D) Unionized HCl

Answer.

Q 7 – What happens when a solution of an acid is mixed with a solution of a base in a test tube?

(i) The temperature of the solution increases

(ii) The temperature of the solution decreases

(iii) The temperature of the solution remains the same

(iv) Salt formation takes place

(A) (i) only

(B) (i) and (iii)

(C) (ii) and (iii)

(D) (i) and (iv)

Answer.

Q 8 – Which of the following is used for dissolution of gold?

(A) Hydrochloric acid

(B) Sulphuric acid

(C) Nitric acid

(D) Aqua regia

Answer.

Q 9 – Which of the following salts does not contain water of crystallisation?

(A) Blue vitriol

(B) Baking soda

(C) Washing soda

(D) Gypsum

Answer.

Q 10 – Sodium carbonate is a basic salt because it is a salt of

(A) strong acid and strong base.

(B) weak acid and weak base.

(C) strong acid and weak base.

(D) weak acid and strong base.

Answer.

Q 11 – Common salt besides being used in kitchen can also be used as the raw material for making

(i) washing soda.

(ii) bleaching powder.

(iii) baking soda.

(iv) slaked lime.

(A) (i) and (ii)

(B) (i), (ii) and (iv)

(C) (i) and (iii)

(D) (i), (iii) and (iv)

Answer.

Q 12 – One of the constituents of baking powder is sodium hydrogen carbonate, the other constituent is

(A) hydrochloric acid.

(B) tartaric acid.

(C) acetic acid.

(D) sulphuric acid.

Answer.

Q 13 – Which of the following is not a salt?

(A) Sodium chloride

(B) Slaked lime

(C) Lead sulphide

(D) Zinc nitrate

Answer.

Q 14 – A compound is prepared from gypsum upon heating to a temperature of 373 K and it changes back to gypsum on adding water. Which is the incorrect statement about the compound?

(A) The compound is used for setting fractured bones.

(B) The compound is called plaster of Paris which is calcium sulphate dehydrate with a formula CaSO₄.2H0.

(C) If heated at higher temperature, the compound becomes dehydrated and is called dead burnt plaster.

(D) Both (A) and (B).

Answer.

Q 15 – A milk man adds a very small amount of baking soda to fresh milk. Why?

(A) To increase the rate of fermentation

(B) To decrease the rate of fermentation

(C) To increase its quality

(D) To make paneer

Answer.

Q 16 – Which of the given substances is used in the following applications?

(i) It is used as a fire proofing Material.

(ii) It is used for sealing gaps in laboratory apparatus.

(iii) It is used in making toys.

(A) Bleaching powder

(B) Plaster of Paris

(C) Baking soda

(D) Washing soda

Answer.

Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

(A) Both A and R are true and R is the correct explanation of A.

(B) Both A and R are true but R is NOT the correct explanation of A.

(C) A is true but R is false.

(D) A is false and R is True.

Answer.

Q 17 – Assertion (A): When zinc is added to dilute hydrochloric acid, hydrogen is given off.

Reason (R): Hydrogen chloride molecules contain hydrochloric acid and hydrogen atoms.

Answer.

Q 19 – Assertion (A): Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid.

Reason (R): Carbon dioxide is given off in the reaction.

Answer.

Q 20 – Assertion (A): Ammonia solution is an alkali.

Reason (R): Ammonia solution turns blue litmus paper red.

Answer.

Q 21 – Assertion (A): When common salt is kept open, it absorbs moisture from the air.

Reason (R): Common salt contains magnesium chloride.

Answer.

Science MCQ Questions For Class 10 Chapter wise

Q 22 – Assertion (A): Baking soda creates acidity in the stomach.

Reason (R): Baking soda is alkaline.

Answer.

Q 23 – Assertion (A): Plaster of Paris is used by doctors for setting fractured bones.

Reason (R): When Plaster of Paris is mixed with water and applied around the fractured limbs, it sets into a hard mass.

Answer.

Q 24 – Assertion: Sodium hydrogen carbonate is an acidic salt.

Reason: It is a salt produced by the neutralization reaction between a strong base (NaOH) and a weak acid (H₂CO₃).

Answer.

Attempt any 4 sub-parts from each question. Each sub-part carries 1 mark.

Read the following and answer any four questions from Q.1 to Q.5.

The reaction between MnO₂ with HC1 is depicted in the following diagram. It was observed that a gas with bleaching abilities was released.

Acids Bases and Salts Class 10 Science MCQ Questions

Q 25 – The chemical reaction between Mn0₂ and HCl is an example of:

(A) displacement reaction

(B) combination reaction

(C) redox reaction

(D) decomposition reaction.

Answer.

Q 26 – Chlorine gas reacts with________ to form bleaching powder.

(A) dry Ca(OH)₂

(B) dil. solution of Ca(OH)₂

(C) conc. solution of Ca(OH)₂

(D) dry Ca O

Answer.

Q 27 – Identify the correct statement from the following:

(A) MnO₂ is getting reduced whereas H Cl is getting oxidized.

(B) MnO₂ is getting oxidized whereas H Cl is getting reduced.

(C) MnO₂ and H Cl both are getting reduced.

(D) MnO₂ and H Cl both are getting oxidized.

Answer.

Q 28 – In the above discussed reaction, what is the nature of Mn0₂ ?

(A) Acidic oxide

(B) Basic oxide

(C) Neutral oxide

(D) Amphoteric oxide

Answer.

Q 29 – What will happen if we take dry HCl gas instead of aqueous solution of H Cl?

(A) Reaction will occur faster.

(B) Reaction will not occur.

(C) Reaction rate will be slow.

(D) Reaction rate will remain the same.

Answer.

Read the following and answer any four questions from Q.1 to .5.

Frothing in Yamuna:

The primary reason behind the formation of the toxic foam is high phosphate content in the wastewater because of detergents used in dyeing industries, dhobi ghat Yamuna’s pollution level is so bad that parts of it have been labelled ‘dead’ as there is no oxygen in it for aquatic life to survive.

Q 30 – Predict the pH value of the water of river Yamuna if the reason for froth is high content of detergents dissolved in it.

(A) 10-11

(B) 5-7

(C) 2-5

(D) 7

Answer.

Q 31 – Which of the following statements is correct for the water with detergents dissolved in it?

(A) low concentration of hydroxide ion (OH^–)and high concentration of hydronium ion (H₃O⁺).

(B) high concentration of hydroxide ion (OH^–) and low concentration of hydronium ion (H₃O^÷).

(C) high concentration of hydroxide ion (OH^–) as well as hydronium ion (H₃0⁺).

(D) equal concentration of both hydroxide ion (OH^–) and hydronium ion (H₃O +).

Answer.

The table provides the pH value of four solutions P, Q, R and S

Solution	pH value
P	2
Q	9
R	5
s	11

Q 32 – Which of the following correctly represents the solutions in increasing order of their hydronium ion concentration?

(A) P>Q>R>S (B) P>S>Q>R

(C) S<Q<R<P (D) S<P<Q<R

Answer.

Q 33 – High content of phosphate ion in river Yamuna may lead to:

decreased level of dissolved oxygen and increased growth of algae.
decreased level of dissolved oxygen and no effect of growth of algae.
increased level of dissolved oxygen and increased growth of algae.

(13) decreased level of dissolved oxygen and decreased growth of algae.

Answer.

Q 34 – If a sample of water containing detergents is provided to you, which of the following methods will you adopt to neutralize it?

Treating the water with baking soda
Treating the water with vinegar
Treating the water with caustic soda

(0) Treating the water with washing soda

Answer.

(iv) Read the following and answer any four questions from Q.1 to Q.5

Study the given table and answer the following questions. It shows the pH value of the plaque (which collects around teeth) surrounding the teeth of a child over 3 hrs.

Timeih	pH
0.00	7.0
1,0	7.0
2.0	7.1
3.0	7.2
4.0	4.1

Q 35 – The three constituents of plaque are

(A) Acid (B) Saliva

(C) Bacteria (D) All of these

Answer.

Q 36 – The pH which leads to tooth decay?

(A) above 7 (B) at 7

(C) below 5.5 (D) above 5.5

Answer.

Q 37 – State the time during the day when condition most favourable for process of tooth decay.

(A) 1.0 (B) 2.0

(C) 3.0 (0) 4.0

Answer.

Q 38 – The nature of toothpastes commonly used to protect tooth decay is:

(A) acidic (B) basic

(C) neutral (D) none of the above

Answer.

Suhana takes three beakers A, B and C filled with aqueous solutions of glucose, alcohol and hydrochloric acid respectively as shown in the following figure:

Q 39 – Which of the following statement is correct in terms of glowing of bulb when the switch is ON?

Bulb A and B do not glow but bulb C glows.
Bulb A and C do not glow but bulb B glows.
Bulb B and C do not glow but bulb A glows.
All the bulbs glow.

Answer.

Q 40 – The bulb glows in a solution depending on whether the solution is:

(A) acidic (B) an electrolyte

(C) basic (D) a non electrolyte

Answer.

Q 41 – Which of the following are present in a dilute aqueous solution of hydrochloric acid?

(A) H₃0⁺ + Cl^– (B) H₃0⁺ + OH^–

(C) C1 + OW (D) Unionized HCl

Answer.

Q 42 – Which of the following statement is true if alcohol is replaced with NaOH solution:

bulb glows in alcohol but not in NaOH solution.
bulb will glow in NaOH solution but not in alcohol.
bulb does not glow in alcohol and neither will it glow in NaOH solution.
bulb glows in NaOH solution as well as in alcohol.

Answer.

(v) Study the given experimental set-up and answer the following questions.

Q 43 – The above experimental set up shows reaction between metal and

Acid
Metal carbonate
Metal hydrogen carbonate
Metal oxide

Answer.

Q 44 – Which gas is liberated during the process?

Hydrogen gas
Carbon dioxide gas
Nitrogen gas
Hydrogen sulphide gas

Answer.

Q 45 – Name the gas evolved:

Hydrogen
Oxygen
Sulphur dioxide gas
Carbon dioxide

Answer.

Q 46 – The gas evolved is :

Lighter than air
Heavier than air

Answer.

Q 47 – If the metal used above is zinc, choose the correct balanced chemical equation for the evolution of gas ?

2Zn_(s) + H₂SO₄(dil) 2ZnSO_4(aq + H_2(g)
Zn_(s) + H₂SO₄(dil) ZnSO₄₀,₁₎ + H_2(g)
Zn_(s) + 2H₂SO₄(dil) 2ZnSO_4(aq) + H_(g)
2Zn_s) + H₂SO₄(dil) ZnSO_4aq) + 2H_2(g)

Answer.

Q 48 – What nature of hydrogen is used as a fuel in rocket ?

(A) solid (B) liquid

(C) gaseous (D) all of the above

Answer.

Q 49 – Name the product when water is added to quicklime.

(A) Calcium oxide (B) Calcium hydroxide

(C) Calcium dioxide (D) Calcium carbonate

Answer.

Q 50 – The common name for quick lime is:

(A) Calcium hydroxide (B) Calcium oxide

(C) Calcium dioxide (D) Calcium carbonate

Answer.

Q 51 – The correct formula for calcium hydroxide is:

(A) Ca(OH) (B) Ca(OH₂)

(C) Ca(OH)₂ (D) Ca₂0H₂

Answer.

Q 52 – Which of the following statements is correct aboir the above reaction based on your observations?

It is an endothermic reaction.
It is an exothermic reaction
The pH of the resulting solution will be more than seven.
The pH of the resulting solution will be less than seven.

(A) (i) and (ii) (B) (ii) and (iii)

(C) (i) and (iv) (D)(iii)and (iv)

Answer.

(vi) Read the given passage and answer the following questions from Q.1. to Q.4.

Sanjana while preparing cake used baking soda in small amounts. It helps to make the cake soft and spongy. An aqueous solution of baking soda also turns red litmus blue. It is also used in soda acid extinguisher

Q 53 – Name the gas produced by the reaction of baking
soda and acid which helps as fire extinguisher:

(A) Carbon monoxide

(B) Carbon dioxide

(C) Hydrogen

(D) Oxygen

Answer.

Q 54 – Write the products formed in the above process:

Zinc sulphate only
Only hydrogen gas
Zinc sulphate and hydrogen gas
Zinc sulphide and hydrogen gas.

Answer.

Q 55 – A new product sodium zincate is formed if sulphuric acid is replaced with:

(A) Sodium hydroxide

(B) Sodium oxide

(C) Zinc oxide

(D) water

Answer.

(vii) Read the given passage and answer any four questions from Q.1 to Q.5.

P, Q, R are different colourless solids, while S is a colourless solution. They are (in random order) Sodium chloride (NaC1), Calcium Carbonate (CaCO₃), Acetic acid (CH₃COOH) and Phenolphthalein indicator. Small amount of the above substances were added in pairs (e.g. P with Q; Q with R etc.) to a small amount of water in a test tube. They give the following results as shown in the observation table.

Observation Table:

	P	Q	R
Q	No reaction	–	No reaction
R	Dark Pink Colour	No reaction	–
S	No reaction	No reaction	Effervescence

Q 56 – The chemicals are:

P	Q	R	S
NaC1	CaCO₃	CH₃COOH	Phenolphthalein
Phenolphthalein	NaCI	CaCO₃	CH₃COOH
CH₃COOH	Phenolphthalein	NaC1	CaCO₃
CaCO₃	CH₃COOH	Phenolphthalein	NaCI

Answer.

Q 57 – Which of the following reaction is incorrect ?

Phenolphthalein (P) + NaCl (Q)
Phenolphthalein + CaCO₃ (R) Alkaline
medium (Dark Pink Colour)
Phenolphthalein + NaCI —* Acidic medium (Blue colour)
CaCO₃ (R) + 2CH₃COOH (S)

(CH₃COO)₂Ca + CO₂ (effervescence) + 2H₂0

Answer.

Q 58 – The chemicals that can be used as an acid-base indicator by a visually impaired student is

(A) Petunia leaves (B) Vanilla essence

(C) Phenolphthalein (D) Turmeric

Answer.

Q 59 – If acetic acid and hydrochloric acid of same concentration are taken, HCl is a stronger acid because it contains:

more of Cl^– ions.
more of 11⁺ ions.
less of 1-1⁺ ions
more of CH₃ COO^– ions.

Answer.

Q 60 – A metal is treated with dilute sulphuric acid. The gas evolved is collected by the method shown in the figure.

Sodium sulphate and carbon dioxide gas.
Sodium carbonate and water.
Sodium carbonate, carbon dioxide and water.
Sodium oxide carbon dioxide and water

Answer.

Q 61 – The pH of baking soda solution is :

more than 7
less than 7
equal to 7
less than 7 but more than .

Answer.

Q 62 – What is the chemical name for baking soda?

Sodium carbonate
sodium bicarbonate
calcium carbonate
calcium bicarbonate.

Answer.

(viii) Read the given passage and answer the following questions from Q.1. to Q.5.

A dry pellet of a common base B when kept in open absorbs moisture and turns sticky. The compound is also a by-product of chloro-alkali process.

Q 63 – Identify B:

(A) Sodium chloride (B) Sodium hydroxide

(C) Carbon dioxide (D) Sodium carbonate

Answer.

Q 64 – What type of reaction occurs when B is treated with an acidic oxide?