338 + Interview Questions in ACIDS IN GENERAL AWARENESS Page 3 InterviewSolution

101.	A sample of soil is mixed with water and allowed to settle .The clear supernatant solution turns the pH paper yellowish - orange . Which of the following would change the colour of this pH paper to greenish- blue?A. Lemon juiceB. VinegarC. Common saltD. An antacid
Answer» Correct Answer - D As pH p[aper turns greenish blue for weakly basic compund and antacids contain weak base like `Mg(OH)_(2)`. So an antacid would change the colour of this pH paper to greenish-blue . Other options (a) and (b) contain acids and option (c ) is a neutral salt.

Discussion

102.	What are the uses of Plaster of Paris?
Answer» 1. It is used for plastering bones 2. It is used for making casts for statues.

102.

What are the uses of Plaster of Paris?

Answer»

1. It is used for plastering bones

2. It is used for making casts for statues.

Discussion

103.	Write any four uses of bases.
Answer» 1. Sodium hydroxide is used in the manufacture of soap. 2. Calcium hydroxide is used in white washing of building. 3. Magnesium hydroxide is used as a medicine for stomach disorder. 4. Ammonium hydroxide is used to remove grease stains from cloths.

103.

Write any four uses of bases.

Answer»

1. Sodium hydroxide is used in the manufacture of soap.

2. Calcium hydroxide is used in white washing of building.

3. Magnesium hydroxide is used as a medicine for stomach disorder.

4. Ammonium hydroxide is used to remove grease stains from cloths.

Discussion

104.	Write any four uses of acids
Answer» Sulphuric acid is called King of Chemicals because it is used in the preparation of many other compounds. It is used in car batteries also. Hydrochloric acid is used as a cleansing agent in toilets. Citric acid is used in the preparation of effervescent salts and as a food preservative. Nitric acid is used in the manufacture of fertilizers, dyes, paints and drugs.

Discussion

105.	Write any five uses of salts.
Answer» Common Salt (NaCl): It is used in our daily food and used as a preservative. 1. Washing Soda (Sodium Carbonate): It is used in softening hard water. It is used in glass, soap and paper industries. 2. Baking Soda (Sodium bicarbonate -NaHCO₃): It is used in making of baking powder which is a mixture of baking soda and tartaric acid. It is used in soda-acid fire extinguishers. Baking powder is used to make cakes and bread, soft and spongy. It neutralizes excess acid in the stomach and provides relief. 3. Bleaching powder (Calcium Oxychloride – CaOCl₂) It is used as disinfectant. It is used in textile industry for bleaching cotton and linen. 4. Plaster of Paris (Calcium Sulphate Hemihydrate – CaSO₄ . \(\frac{1}{2}\)H₂O) It is used for plastering bones. It is used for making casts for statues.

105.

Write any five uses of salts.

Answer»

Common Salt (NaCl):

It is used in our daily food and used as a preservative.

1. Washing Soda (Sodium Carbonate):

It is used in softening hard water.
It is used in glass, soap and paper industries.

2. Baking Soda (Sodium bicarbonate -NaHCO₃):

It is used in making of baking powder which is a mixture of baking soda and tartaric acid.
It is used in soda-acid fire extinguishers. Baking powder is used to make cakes and bread, soft and spongy.
It neutralizes excess acid in the stomach and provides relief.

3. Bleaching powder (Calcium Oxychloride – CaOCl₂)

It is used as disinfectant.
It is used in textile industry for bleaching cotton and linen.

4. Plaster of Paris (Calcium Sulphate Hemihydrate – CaSO₄ . \(\frac{1}{2}\)H₂O)

It is used for plastering bones.
It is used for making casts for statues.

Discussion

106.	pH of strong acid is …………(a) 0 (b) 7 (c) 8 (d) 14
Answer» Correct option is: (a) 0

Discussion

107.	If the pH of a solution is 13.8 then it isA) weak acid B) weak base C) strong acid D) strong base
Answer» Correct option is D) strong base

Discussion

108.	Salt formed from a weak acid and strong base pH value is ……………..A) < 7 B) > 7 C) 7 D) ≤ 7
Answer» Correct option is B) > 7

Discussion

109.	Define the term weak base.
Answer» On dissolving in water, a weak base does not dissociate completely and the resulting aqueous solution contains a small proportion of OH ions and the concerned basic radical along with a large proportion of undissociated molecules of the base. e.g. NH₄OH.

109.

Define the term weak base.

Answer»

On dissolving in water, a weak base does not dissociate completely and the resulting aqueous solution contains a small proportion of OH ions and the concerned basic radical along with a large proportion of undissociated molecules of the base.

e.g. NH₄OH.

Discussion

110.	Name a weak base.
Answer» Ammonium hydroxide – NH₄OH

Discussion

111.	Acids in plants and animals are organic acids. Whereas Acids in rocks and minerals are ………(a) Inorganic acids (b) Weak acids
Answer» (a) Inorganic acids

Discussion

112.	Name any two weak acids.
Answer» Acetic acid – CH₃COOH Carbonic acid – H₂CO₃

Discussion

113.	Apple contains malic acid. Orange contains …………(a) citric acid (b) ascorbic acid
Answer» (b) ascorbic acid

Discussion

114.	Active metals react with acids and form A) salt, hydrogen B) salt, water C) salt, nitrogen D) salt, oxygen
Answer» A) salt, hydrogen Correct option is (A)salt, hydrogen

Discussion

115.	Zn + 2HCl ➝ ZnCl2 + ………….. ↑ (a) H2 (b) O2(c) CO2
Answer» Zn + 2HCl ➝ ZnCl₂ + H₂↑

Discussion

116.	More reactive metals react with acids and liberate …………….. gas.A) O2 B) H2 C) Cl2 D) CO2
Answer» Correct option is B) H₂

Discussion

117.	The following are neutralization reactions. i) Acid reacts with base to form salt and waterii) Acid reacts with metal oxide to form salt and water iii) Base reacts with non-metal oxide to form salt and water. A) only i B) both i and ii C) both ii and iii D) All of these
Answer» D) All of these

Discussion

118.	Antacids are A) strong acids B) weak acids C) strong bases D) weak bases
Answer» D) weak bases

Discussion

119.	Base reacts with…………….. to produce salt and A) base, water B) acid, water C) salt,water D) base, salt
Answer» B) acid, water

Discussion

120.	When acid reacts with base it forms salt and water then the reaction is calledA) Hydrolysis B) Esterification C) Neutralization D) Dehydration
Answer» C) Neutralization

Discussion

121.	Family of chloride salts are A) NaCl B) KCl C) MgCl D) All of these
Answer» D) All of these

Discussion

122.	Name any three salts with their molecular formula.
Answer» Sodium chloride – NaCl Potassium sulphate – K₂SO₄ Calcium chloride – CaCl₂

Discussion

123.	Define concentrated solution.
Answer» When the concentration of a solute in its solution is high, it is a concentrated solution.

Discussion

124.	Define the term dilute solution.
Answer» When the concentration of a solute in its solution is low, it is a dilute solution.

Discussion

125.	Define the term anions.
Answer» Anions are negatively charged ions which are attracted towards the positive electrode (anode) when electricity is passed into a solution of an ionic compound.

Discussion

126.	Define the term cations.
Answer» Cations are positively charged ions which are attracted towards negative electrode (cathode) when electricity is passed into a solution of an ionic compound.

Discussion

127.	If the soil is acidic it is treated with…… A) Calcium hydroxide B) Calcium carbonate C) Acetic acid D) A or B
Answer» Correct option is D) A or B

Discussion

128.	Which reaction will yield CH3CH2-D? (A) CH3CH3 + D2O (B) CH3CH2Li + D2O (C) CH3CH2OLi + D2O (D) CH3CH2OH + D2O (E) More than one of these
Answer» CH₃CH₂Li + D₂O reaction will yield CH₃CH_2-D.

Discussion

129.	The correct sequence of the ions shown, in order of increasing basicity, is: (A) CH3CH2:- < CH2=CH:- < HC≡C:-(B) CH3CH2:- < HC≡C:- < CH2=CH:-(C) HC≡C:- < CH3CH2:- < CH2=CH:-(D) CH2≡CH:- < HC≡C:- < CH3CH2:-(E) HC≡C:- < CH2=CH:- < CH3CH2:-
Answer» (E) HC≡C:^- < CH₂=CH:^- < CH₃CH₂:^-

Discussion

130.	The compounds ethane, ethene, and ethyne exhibit this order of increasing acidity: (A) Ethyne < ethene < ethane (B) Ethene < ethyne < ethane (C) Ethane < ethyne < ethene (D) Ethane < ethene < ethyne (E) Ethene < ethane < ethyne
Answer» (D) Ethane < ethene < ethyne

Discussion

131.	……………. is used in soda – acid extinguishers i) Baking soda ii) NaHCO3iii) CaOCl2 iv) H2SO4A) only i B) Both i and ii C) only iii D) Both iii and iv
Answer» B) Both i and ii

Discussion

132.	Baking powder is mixture of…………….and ……………. A) Baking soda, citric acid B) Baking soda, tartaric acid C) Washing soda, tartaric acid D) Washing soda, citric acid
Answer» B) Baking soda, tartaric acid

Discussion

133.	A metal carbonate w on reacting with an acid gives a gas X which when passed through a solution Y gives the carbonate back. Solution Y reacts with gas Z to form a compound P used for decolourisation. ldentify W, X, Y, Z and P.
Answer» The Correct option is (d)

Discussion

134.	Match column I with column ll and mark the correct option from the given cGolumn IColumn ll(a) NaHCO3(i) Used for disinfecting water(b) Na2CO3(ii) Used in soda-acid fire extinguishers(c) CaoCl2(iii) Used for removing permanent hardness of water(iv) Used for making toys, materials for decoration(A) (a) - (iii), (b) - (i), (c) - (iv), (d) - (ii) (B) (a) - (ii), (b) - (iii), (c) - (i), (d) - (iv) (c) (a) - (iii), (b) - (ii), (c) - (i), (d) - (iv) (D) (a) - (i), (b) - (ii), (c) - (iv), (d) - (iii)
Answer» The Correct option is (B)

Discussion

135.	Read the given passage and fill in the blanks by selecting an appropriate option.Bleaching powder is a i powder. When exposed to air, it reacts with ii of the air to liberate Cl2 gas. lt is iii in cold water and milkiness of the solution is due to presence of unreacted iv gas. lt reacts with HCI and H2SO4 liberating v gas.
Answer» The Correct option is: (B)

Discussion

136.	Match column I (different substances) with column II (pH values) and select the correct option from the given codes.Column IColumn llP. Tomato juice1. 7.3 - 7.5Q. Gastric juice2. 6.5 - 7.5R. Blood3, 4.5 - 5.5S. Saliva4. 4.0 - 4.4T. Coffee5. 1.0 - 3.0(A) P-2, Q-1, R-3, S-4, T-5 (B) P-1, Q-4, R-3, S-2, T-5 (c) P-4, Q-5, R-1, S-2, T-3 (D) P-2, Q-3, R-1, S-5, T-4
Answer» (c) P-4, Q-5, R-1, S-2, T-3

Discussion

137.	Name the acid present in (a) Lemon (b) Vinegar
Answer» Ascorbic acid is present in lemon and acetic acid is present in vinegar.

Discussion

138.	Select the strongest base.(A) OH-(B) RC≡C-(C) NH2-(D) CH2=CH-(E) CH3C2-
Answer» The strongest base is CH₃CH₂^-

Discussion

139.	Which of the following organic compounds is the strongest acid? (A) C6H12 pKa = 52 (B) CH3CH3 pKa = 50 (C) CH3CH2OH pKa = 18(D) CH3CO2H pKa = 5 (E) CF3CO2H pKa = 0
Answer» (E) CF₃CO₂H pK_a = 0

Discussion

140.	Which is the weakest acid? (A) CH3CH2CH2CH2CHFCO2H (B) CH3CHCH2CH2CH2CH2OH (C) CH3CH2CH2CH2CH2SO3H (D) CH3CH2CH2CH2CH=CH2 (E) CH3CH2CH2CH2NH2
Answer» (A) CH₃CH₂CH₂CH₂CHFCO₂H

Discussion

141.	While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?
Answer» The process of dissolving an acid or a base in water is a highly exothermic one. Care must be taken while mixing concentrated nitric acid or sulphuric acid with water. The acid must always be added slowly to water with constant stirring. If water is added to a concentrated acid, the heat generated may cause the mixture to splash out and cause burns. The glass container may also break due to excessive local heating

Discussion

142.	Which pair of species are both bases in the following reaction? HCN and H2O H3O+ and CN(A) H2O and CN-(B) H3O+ and H2O (C) HCN and H3O+ (D) HCN and CN- (E) H3O+ and CN-
Answer» (A) H₂O and CN^-

Discussion

143.	Match the following. a) acids — i) pH < 7 b) bases — ii) pH = 7 c) neutral — iii) pH > 7 A) a → i, b → iii, c →ii B) a → i, b →ii, c → iii C) a → iii, b → ii, c → i D) a → ii, b →i, c → iii
Answer» A) a → i, b → iii, c →ii

Discussion

144.	Which of the folloiwng sttements is not correct?A. All metal carbonates react with acid to give a slat , walter and carbon dioxideB. All metal oxides react with water to ive salt and acidC. some metals react with acids to give salt and hydrogenD. Some non-metal oxides rect withh water to form an acid
Answer» Correct Answer - B Most metal ixides are insoluble in water but some of these (e.g `Na_(2)O,CaO)` dissolve in water to from alkalies not solt and acid e.g. `Na_(2)O(s)+H_(2)O(l)rarr2NaOH(aq)`

Discussion

145.	Which among the following is not a base?A. NaOHB. KOHC. `NH_(4)OH`D. `C_(2)H_(5)OH`
Answer» Correct Answer - D `C_(2)H_(5)OH` is not a base .It is an example of an orgaince compound known as alcholo (thyl alcohol) which has somewhat acidic nature. And also `C_(2)H_(5)OH` does not give `OH^(-)` ions in the solution , so it not a base.

Discussion

146.	Washing soda is……………salt. A) Acidic B) Basic C) Neutral D) Amphoteric
Answer» Correct option is B) Basic

Discussion

147.	Which one of the following types of medicines is used for treating irritation in stomach ? A) antibioticB) analgesic C) antacid D) antiseptic
Answer» Correct option is C) antacid

Discussion

148.	Why do acids not show acidic behaviour in the absence of water?
Answer» Acids do not show acidic behaviour in the absence of water because the dissociation of hydrogen ions from an acid occurs in the presence of water only. It is the hydrogen ions that are responsible for the acidic behaviour.

Discussion

149.	Acids do not show their acidic properties in the absence of _____
Answer» Correct Answer - water

Discussion

150.	Into which type will you classify the above compounds, acid, base or salt?
Answer» NH₃: base Na₂O : base CaO : base

150.

Into which type will you classify the above compounds, acid, base or salt?

Answer»

NH₃: base

Na₂O : base

CaO : base

Discussion

Explore topic-wise InterviewSolutions in .

A sample of soil is mixed with water and allowed to settle .The clear supernatant solution turns the pH paper yellowish - orange . Which of the following would change the colour of this pH paper to greenish- blue?A. Lemon juiceB. VinegarC. Common saltD. An antacid

What are the uses of Plaster of Paris?

Write any four uses of bases.

Write any four uses of acids

Write any five uses of salts.

pH of strong acid is …………(a) 0 (b) 7 (c) 8 (d) 14

If the pH of a solution is 13.8 then it isA) weak acid B) weak base C) strong acid D) strong base

Salt formed from a weak acid and strong base pH value is ……………..A) &lt; 7 B) &gt; 7 C) 7 D) ≤ 7

Define the term weak base.

Name a weak base.

Acids in plants and animals are organic acids. Whereas Acids in rocks and minerals are ………(a) Inorganic acids (b) Weak acids

Name any two weak acids.

Apple contains malic acid. Orange contains …………(a) citric acid (b) ascorbic acid

Active metals react with acids and form A) salt, hydrogen B) salt, water C) salt, nitrogen D) salt, oxygen

Zn + 2HCl ➝ ZnCl2 + ………….. ↑ (a) H2 (b) O2(c) CO2

More reactive metals react with acids and liberate …………….. gas.A) O2 B) H2 C) Cl2 D) CO2

The following are neutralization reactions. i) Acid reacts with base to form salt and waterii) Acid reacts with metal oxide to form salt and water iii) Base reacts with non-metal oxide to form salt and water. A) only i B) both i and ii C) both ii and iii D) All of these

Antacids are A) strong acids B) weak acids C) strong bases D) weak bases

Base reacts with…………….. to produce salt and A) base, water B) acid, water C) salt,water D) base, salt

When acid reacts with base it forms salt and water then the reaction is calledA) Hydrolysis B) Esterification C) Neutralization D) Dehydration

Family of chloride salts are A) NaCl B) KCl C) MgCl D) All of these

Name any three salts with their molecular formula.

Define concentrated solution.

Define the term dilute solution.

Define the term anions.

Define the term cations.

If the soil is acidic it is treated with…… A) Calcium hydroxide B) Calcium carbonate C) Acetic acid D) A or B

Which reaction will yield CH3CH2-D? (A) CH3CH3 + D2O (B) CH3CH2Li + D2O (C) CH3CH2OLi + D2O (D) CH3CH2OH + D2O (E) More than one of these

The correct sequence of the ions shown, in order of increasing basicity, is: (A) CH3CH2:- &lt; CH2=CH:- &lt; HC≡C:-(B) CH3CH2:- &lt; HC≡C:- &lt; CH2=CH:-(C) HC≡C:- &lt; CH3CH2:- &lt; CH2=CH:-(D) CH2≡CH:- &lt; HC≡C:- &lt; CH3CH2:-(E) HC≡C:- &lt; CH2=CH:- &lt; CH3CH2:-

The compounds ethane, ethene, and ethyne exhibit this order of increasing acidity: (A) Ethyne &lt; ethene &lt; ethane (B) Ethene &lt; ethyne &lt; ethane (C) Ethane &lt; ethyne &lt; ethene (D) Ethane &lt; ethene &lt; ethyne (E) Ethene &lt; ethane &lt; ethyne

……………. is used in soda – acid extinguishers i) Baking soda ii) NaHCO3iii) CaOCl2 iv) H2SO4A) only i B) Both i and ii C) only iii D) Both iii and iv

Baking powder is mixture of…………….and ……………. A) Baking soda, citric acid B) Baking soda, tartaric acid C) Washing soda, tartaric acid D) Washing soda, citric acid

A metal carbonate w on reacting with an acid gives a gas X which when passed through a solution Y gives the carbonate back. Solution Y reacts with gas Z to form a compound P used for decolourisation. ldentify W, X, Y, Z and P.

Name the acid present in (a) Lemon (b) Vinegar

Select the strongest base.(A) OH-(B) RC≡C-(C) NH2-(D) CH2=CH-(E) CH3C2-

Which of the following organic compounds is the strongest acid? (A) C6H12 pKa = 52 (B) CH3CH3 pKa = 50 (C) CH3CH2OH pKa = 18(D) CH3CO2H pKa = 5 (E) CF3CO2H pKa = 0

Which is the weakest acid? (A) CH3CH2CH2CH2CHFCO2H (B) CH3CHCH2CH2CH2CH2OH (C) CH3CH2CH2CH2CH2SO3H (D) CH3CH2CH2CH2CH=CH2 (E) CH3CH2CH2CH2NH2

While diluting an acid, why is it recommended that the acid should be added to water and not water to the acid?

Which pair of species are both bases in the following reaction? HCN and H2O H3O+ and CN(A) H2O and CN-(B) H3O+ and H2O (C) HCN and H3O+ (D) HCN and CN- (E) H3O+ and CN-

Match the following. a) acids — i) pH &lt; 7 b) bases — ii) pH = 7 c) neutral — iii) pH &gt; 7 A) a → i, b → iii, c →ii B) a → i, b →ii, c → iii C) a → iii, b → ii, c → i D) a → ii, b →i, c → iii

Which among the following is not a base?A. NaOHB. KOHC. `NH_(4)OH`D. `C_(2)H_(5)OH`

Washing soda is……………salt. A) Acidic B) Basic C) Neutral D) Amphoteric

Which one of the following types of medicines is used for treating irritation in stomach ? A) antibioticB) analgesic C) antacid D) antiseptic

Why do acids not show acidic behaviour in the absence of water?

Acids do not show their acidic properties in the absence of _____

Into which type will you classify the above compounds, acid, base or salt?

Salt formed from a weak acid and strong base pH value is ……………..A) < 7 B) > 7 C) 7 D) ≤ 7

The correct sequence of the ions shown, in order of increasing basicity, is: (A) CH3CH2:- < CH2=CH:- < HC≡C:-(B) CH3CH2:- < HC≡C:- < CH2=CH:-(C) HC≡C:- < CH3CH2:- < CH2=CH:-(D) CH2≡CH:- < HC≡C:- < CH3CH2:-(E) HC≡C:- < CH2=CH:- < CH3CH2:-

The compounds ethane, ethene, and ethyne exhibit this order of increasing acidity: (A) Ethyne < ethene < ethane (B) Ethene < ethyne < ethane (C) Ethane < ethyne < ethene (D) Ethane < ethene < ethyne (E) Ethene < ethane < ethyne

Match the following. a) acids — i) pH < 7 b) bases — ii) pH = 7 c) neutral — iii) pH > 7 A) a → i, b → iii, c →ii B) a → i, b →ii, c → iii C) a → iii, b → ii, c → i D) a → ii, b →i, c → iii