338 + Interview Questions in ACIDS IN GENERAL AWARENESS Page 1 InterviewSolution

1.	Choose base from the following compounds:(a) Salt(b) Acid of salt (c) Washing soda (d) Magic acid
Answer» (c) Washing soda

Discussion

2.	Acid present in tamarind:(a) Lactic acid(b) Citric acid (c) Tartaric acid(d) Acetic acid
Answer» (c) Tartaric acid

Discussion

3.	Natural indicators are prepared from….. i) plants ii) petrochemicals iii) living organisms iv) minerals A) only i B) both i and ii C) both i and iii D) both ii and iv
Answer» C) both i and iii

Discussion

4.	Why lime, orange juice, tamarind etc. sour in taste.
Answer» Because acid is present in these

Discussion

5.	What is the taste of baking soda?
Answer» Baking soda tastes bitter.

Discussion

6.

What are the colours of the following natural and synthetic indicators in acidic and basic solutions? Litmus, turmeric, jamun, methyl orange, phenolphthalein?

Answer»

Indicator	Colour in Acidic Solution	Colour in basic Solution
Litmus	Red	Blue
Turmeric	Yellow	Red
Jamun	Red	Blue-Green
Methyl orange	Red	Yellow
Phenolphthalein	Colourless	Pink

Discussion

7.	……………….. taste is a characteristic property of all acids in aqueous solutions A) Sour B) Bitter C) Salty D) Sweet
Answer» Correct option is A) Sour

Discussion

8.	Define ‘amphoteric oxides’ and give two examples.
Answer» Amphoteric oxides are those oxides which react with both adds as well as bases to form their respective salts and water. Amphoteric oxides show the properties of both acidic oxides as well as basic oxides. ZnO and Al₂O are amphoteric oxides.

Discussion

9.	As aqueous acid solutions conduct electricity, they are identified as A) electrolytes B) bad conductors C) good conductors D) Both A and C
Answer» D) Both A and C

Discussion

10.	Which of the following solutions convert red litmus paper to blue A) HCl B) HNO2 C) NaOH D) None
Answer» Correct option is C) NaOH

Discussion

11.	Write down the changes that will be seen in each instance and explain the reason behind it.A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred.
Answer» Blue litmus Paper: HCl is hydrochloric acid, so the blue litmus turns red. When equal amount of NaOH is added the colour again changes to blue and remains the same. Red litmus paper: Red litmus paper shows no colour change in hydrochloric acid. When some amount of NaOH is added the colour changes to blue initially but when the amount of NaOH is sufficient the blue colour dissappears. Equal amounts of HCl and NaOH results in the formation of NaCl, a salt, and the solvent water. This reaction is called the neutralization reaction.

11.

Write down the changes that will be seen in each instance and explain the reason behind it.A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred.

Answer»

Blue litmus Paper:

HCl is hydrochloric acid, so the blue litmus turns red.
When equal amount of NaOH is added the colour again changes to blue and remains the same.

Red litmus paper:

Red litmus paper shows no colour change in hydrochloric acid.
When some amount of NaOH is added the colour changes to blue initially but when the amount of NaOH is sufficient the blue colour dissappears.
Equal amounts of HCl and NaOH results in the formation of NaCl, a salt, and the solvent water. This reaction is called the neutralization reaction.

Discussion

12.	The example for salt having basic nature A) NaCB) KCl C) NH4Cl D) CH3COONA
Answer» Correct option is D) CH₃COONA

Discussion

13.	Non metal oxides are generally……. in nature A) Acidic B) Basic C) Amphoteric D) Neutral
Answer» Correct option is (A) Acidic Correct option is A) Acidic

Discussion

14.	Metal oxides are generally …………… in nature A) Acidic B) Basic C) Amphoteric D) Neutral
Answer» Correct option is B) Basic

Discussion

15.	Like acids, aqueous basic solutions conduct …………, and are identified as ………………A) heat, electrolytes B) electricity, electrolytes C) electricity, nonelectrolytes D) heat, partial electrolytes
Answer» B) electricity, electrolytes

Discussion

16.	The example for salt having acidic nature A) NaCl B) KCl C) NH4Cl D) CH3COONA
Answer» Correct option is C) NH₄Cl

Discussion

17.	Which of the following compound is used in glass, paper and soap industry? A) Washing soda B) Baking soda C) Calcium hydroxide D) Plaster of pads
Answer» Correct option is A) Washing soda The answer is option A

Discussion

18.	Which of the following salt solutions are basic in nature A) NaiCl B) NH4ClC) Na2CO3 D) KCl
Answer» Correct option is C) Na₂CO₃

18.

Which of the following salt solutions are basic in nature A) NaiCl B) NH4ClC) Na2CO3 D) KCl

Answer»

Correct option is C) Na₂CO₃

Discussion

19.	Which of the following is an antisepticA) Na2CO3B) NaHCO3 C) NaCl D) Na2SO4
Answer» Correct option is B) NaHCO₃

Discussion

20.	The chemical formula of plaster of pans is A) CuSO4 .5H2O B) CuSO4 .H2O C) CUSO4 .\(\frac{1}{2}\)H2O D) CaSO4 .\(\frac{1}{2}\)H2O
Answer» D) CaSO_{4 .}\(\frac{1}{2}\)H₂O

Discussion

21.	The formula of gypsum is A) CaSO4 .2H2O B) CaSO4 ,3H2O C) CaOCl2 D) CaSO4.\(\frac{1}{2}\)H2O
Answer» D) CaSO_4.\(\frac{1}{2 }\)H₂O

Discussion

22.	Match the following. i) Milk of magnesia — CaOCl2 ii) Gypsum — Mg(OH)2 iii) Bleaching powder — Na2CO3 iv) Washing soda — CaSO4 .2H2 O A) i → a, ii → c, iii → d, iv → b B) i → d, ii → b, iii → a,iv → c C) i → b, ii → a, iii → d, iv → c D) i → b, ii → d, iii → a, iv → c
Answer» D) i → b, ii → a, iii → d, iv → c

Discussion

23.	The hydrated salt of copper sulphate has ……… colour (a) Red (b) White (c) Blue
Answer» The hydrated salt of copper sulphate has Blue

Discussion

24.	Match the following.a) Gypsum — i) CuSO4 . 5H2O b) Plaster of pans — ii) CaSO4 . 2H2O c) Hydrous copper sulphate — iii) CaSO4 \(\frac{1}{2}\)H2O d) Anhydrous copper sulphate — iv) CuSO4 A) a → i, b →ii, c → iii, d → iv B) a → iv, b → iii, c → ii, d → i C) a → ii, b → iii, c → i, d → iv D) a → i, b → iii, c → ii, d → iv
Answer» C) a → ii, b → iii, c → i, d → iv

Discussion

25.	The colour of anhydrous copper sulphate is. ………….. A) white B) blueC) green D) orange
Answer» Correct option is A) white

Discussion

26.	The water of crystallisation of hydrous copper sulphate is A) 2 B) 5 C) 7 D) 9
Answer» Correct option is B) 5

Discussion

27.	Adding water to acid is an …………………. reaction. (a) endothermic (b) exothermic (c) neutralisation (d) crystallisation
Answer» Correct option is: (b) Exothermic

Discussion

28.	The colourless solution formed when excess of CO2 is passed through slaked lime is A) CaO B) Ca(OH)2 C) CaCO3 D) Ca(HCO3)2
Answer» D) Ca(HCO₃)₂

Discussion

29.	Adding sodium hydride,NaH,to water produces: (A) H2 and NaOH(aq) (B) H- (aq) + Na+ (aq) (C) H3O+ (aq) + Na+ (aq) (D) H3O- (aq) + Na+ (aq) (E) Na2O + H2
Answer» (A) H₂ and NaOH(aq)

Discussion

30.	What are the names of the following compounds? NH3, Na2O, CaO.
Answer» NH₃ : Ammonia Na₂O : Sodium oxide CaO : Calcium oxide

30.

What are the names of the following compounds? NH3, Na2O, CaO.

Answer»

NH₃ : Ammonia

Na₂O : Sodium oxide

CaO : Calcium oxide

Discussion

31.	The gaseous products that are formed when gun powder is subjectd to heating are dissolved in water. Indentify the products formed on dissolution.A. `H_(2)CO_(3), HNO_(3)`B. `H_(2)SO_(3), H_(2)SO_(4)`C. `H_(2)SO_(4), HNO_(2)`D. `H_(2)SO_(3), H_(2)CO_(3)`
Answer» Correct Answer - D The components present in gun powder are `KNO_(3)`, C and `S. KNO_(3)` on heating gives `KNO_(2) "and" O_(2)`. The liberated `O_(2)` is the source for the combustion of carbon and sulphur. The products formed are `CO_(2) "and" SO_(2)` which dissolve in water to form `H_(2)CO_(3) "and" H_(2)SO_(3)` respectively.

Discussion

32.	Gaseous products formed when gun powder is subjected to heating are dissolved in water. Identify the products formed on dissolution.A. `H_(2)CO_(3), HNO_(3)`B. `H_(2)SO_(3), H_(2)SO_(4)`C. `H_(2)SO_(4), HNO_(2)`D. `H_(2)SO_(3), H_(2)CO_(3)`
Answer» Correct Answer - D The components present in gun powder are `KNO_(3)`, C and `S. KNO_(3)` on heating gives `KNO_(2) "and" O_(2)`. The liberated `O_(2)` is the source for the combustion of carbon and sulphur. The products formed are `CO_(2) "and" SO_(2)` which dissolve in water to form `H_(2)CO_(3) "and" H_(2)SO_(3)`.

Discussion

33.	Name the substances formed by the dissolution of following oxides in water. (a) `CO_(2)` (b) MgO
Answer» (i) `CO_(2) + H_(2)O rarr underset("Carbonic acid")(H_(2)CO_(3))` (ii) `Mgo + H_(2)O rarr underset("Magnesium hydroxide")(Mg(OH)_(2))`

Discussion

34.	Name any two bases with their acidity 1 (monoacidic)
Answer» Sodium hydroxide – NaOH Potassium hydroxide – KOH

Discussion

35.	Define acidity of bases.
Answer» The number of OH ions obtainable by the dissociation of one molecule of a base is called its acidity.

Discussion

36.	Define Basicity of acids.
Answer» The number of H⁺ ions obtainable by the dissociation of one molecule of an acid is called its basicity.

Discussion

37.	Name any two acids with their basicity 1 (monobasic)
Answer» Hydrochloric acid – HCl Nitric acid – HNO₃

Discussion

38.	A student added dil. HCZ to a test tube containing zinc granules and made the following observations. i) The zinc surface becomes dull and black ii) The gas evolved is burnt with a pop sound iii) The solution remains colourless The correct observations are A) i and ii B) i and iii C) ii and iii D) i, ii and iii
Answer» D) i, ii and iii

Discussion

39.	Identify the odd one out and justify.Calcium oxide, magnesium oxide, zinc oxide, sodium oxide.
Answer» Zinc oxide is the odd one out, as it is an amphoteric oxide, and rest all are basic oxides.

Discussion

40.	Give examples of monobasic, dibasic and tribasic acids.
Answer» Monobasic acid examples: HNO₃ , HCl, CH₃COOH Dibasic acid examples: H₂SO₄ , H₂CO₃ Tribasic acid examples: H₃BO₃ , H₃PO₄

40.

Give examples of monobasic, dibasic and tribasic acids.

Answer»

Monobasic acid examples: HNO₃ , HCl, CH₃COOH

Dibasic acid examples: H₂SO₄ , H₂CO₃

Tribasic acid examples: H₃BO₃ , H₃PO₄

Discussion

41.	Write down the changes that will be seen in each instance and explain the reason behind it.50ml water is added to 50ml solution of copper sulphate.
Answer» Copper sulphate solution is blue. It is a concentrated solution. When 50 ml of water is added to this concentrated solution, it becomes a diluted solution. The intensity of the blue colour is now different in this homogenous mixture.

Discussion

42.	Identify the odd one out and justify.Sodium nitrate, sodium carbonate, sodium sulphate, sodium chloride
Answer» Sodium carbonate is the odd one out, as it is made up of a weak acid and strong base, and rest all are formed from strong acid and strong base.

Discussion

43.	Identify the odd one out and justify.(a) Chloride, nitrate, hydride, ammonium
Answer» Ammonium is the odd one out as it is a basic radical and rest all are acidic radicals. Generally, basic radicals are formed by the removal of electrons from the atom of metals such as Na⁺, Cu²⁺. But there are some exceptions, such as NH₄⁺.

Discussion

44.	H2CO3 is …………………. acid. (a) monobasic (b) dibasic (c) tribasic(d) tetrabasic
Answer» Correct option is: (b) dibasic

Discussion

45.	Identify the odd one out and justify.Sodium chloride, potassium hydroxide, acetic acid, sodium acetate.
Answer» Acetic acid is the odd one out. It is an acid, the rest are all salts.

Discussion

46.	Identify the odd one out and justify.Ammonium chloride, sodium chloride, potassium nitrate, sodium sulphate
Answer» Ammonium chloride is the odd one out, as it is made up of a strong acid and weak base and rest all are formed from strong acid and strong base.

Discussion

47.	Identify the odd one out and justifyHydrogen chloride, sodium hydroxide, calcium oxide, ammonia
Answer» Hydrogen chloride is the odd one out. It is acidic and rest all are basic.

Discussion

48.	H3PO4 is a …………………. acid. (a) monobasic (b) tribasic (c) tetrabasic (d) dibasic
Answer» Correct option is: (b) tribasic

Discussion

49.	Match the columns:Column ‘A’Column’B’(1) Urine(a) Butyric acid(2) Apples(b) Uric acid(3) Orange(c) Malic acid(4) Butter(d) Citric acid
Answer» (1) Urine - (b) Uric acid (2) Apples - (c) Malic acid (3) Orange - (d) Citric acid (4) Butter - (a) Butyric acid

49.

Match the columns:Column ‘A’Column’B’(1) Urine(a) Butyric acid(2) Apples(b) Uric acid(3) Orange(c) Malic acid(4) Butter(d) Citric acid

Answer»

(1) Urine - (b) Uric acid

(2) Apples - (c) Malic acid

(3) Orange - (d) Citric acid

(4) Butter - (a) Butyric acid

Discussion

50.

How are the following substances classified into three groups with the help of litmus?Lemon, tamarind, baking soda, buttermilk, vinegar, orange, milk, lime, tomato, milk of magnesia, water, alum.

Answer»

Basic Substance: Turns Red Litmus Blue	Acidic Substance: Turns Blue Litmus Red	Neutral Substance: No change in the colour of litmus
Baking Soda	Lemon	water
Lime	Tamarind
Milk of Magnesia	Buttermilk
	Vinegar
	Orange
	Milk
	Tomato
	Alum

Discussion

Explore topic-wise InterviewSolutions in .

Choose base from the following compounds:(a) Salt(b) Acid of salt (c) Washing soda (d) Magic acid

Acid present in tamarind:(a) Lactic acid(b) Citric acid (c) Tartaric acid(d) Acetic acid

Natural indicators are prepared from….. i) plants ii) petrochemicals iii) living organisms iv) minerals A) only i B) both i and ii C) both i and iii D) both ii and iv

Why lime, orange juice, tamarind etc. sour in taste.

What is the taste of baking soda?

What are the colours of the following natural and synthetic indicators in acidic and basic solutions? Litmus, turmeric, jamun, methyl orange, phenolphthalein?

……………….. taste is a characteristic property of all acids in aqueous solutions A) Sour B) Bitter C) Salty D) Sweet

Define ‘amphoteric oxides’ and give two examples.

As aqueous acid solutions conduct electricity, they are identified as A) electrolytes B) bad conductors C) good conductors D) Both A and C

Which of the following solutions convert red litmus paper to blue A) HCl B) HNO2 C) NaOH D) None

Write down the changes that will be seen in each instance and explain the reason behind it.A litmus paper was dropped into 2ml dilute HCl. Then 2ml concentrated NaOH was added to it and stirred.

The example for salt having basic nature A) NaCB) KCl C) NH4Cl D) CH3COONA

Non metal oxides are generally……. in nature A) Acidic B) Basic C) Amphoteric D) Neutral

Metal oxides are generally …………… in nature A) Acidic B) Basic C) Amphoteric D) Neutral

Like acids, aqueous basic solutions conduct …………, and are identified as ………………A) heat, electrolytes B) electricity, electrolytes C) electricity, nonelectrolytes D) heat, partial electrolytes

The example for salt having acidic nature A) NaCl B) KCl C) NH4Cl D) CH3COONA

Which of the following compound is used in glass, paper and soap industry? A) Washing soda B) Baking soda C) Calcium hydroxide D) Plaster of pads

Which of the following salt solutions are basic in nature A) NaiCl B) NH4ClC) Na2CO3 D) KCl

Which of the following is an antisepticA) Na2CO3B) NaHCO3 C) NaCl D) Na2SO4

The chemical formula of plaster of pans is A) CuSO4 .5H2O B) CuSO4 .H2O C) CUSO4 .\(\frac{1}{2}\)H2O D) CaSO4 .\(\frac{1}{2}\)H2O

The formula of gypsum is A) CaSO4 .2H2O B) CaSO4 ,3H2O C) CaOCl2 D) CaSO4.\(\frac{1}{2}\)H2O

The hydrated salt of copper sulphate has ……… colour (a) Red (b) White (c) Blue

The colour of anhydrous copper sulphate is. ………….. A) white B) blueC) green D) orange

The water of crystallisation of hydrous copper sulphate is A) 2 B) 5 C) 7 D) 9

Adding water to acid is an …………………. reaction. (a) endothermic (b) exothermic (c) neutralisation (d) crystallisation

The colourless solution formed when excess of CO2 is passed through slaked lime is A) CaO B) Ca(OH)2 C) CaCO3 D) Ca(HCO3)2

Adding sodium hydride,NaH,to water produces: (A) H2 and NaOH(aq) (B) H- (aq) + Na+ (aq) (C) H3O+ (aq) + Na+ (aq) (D) H3O- (aq) + Na+ (aq) (E) Na2O + H2

What are the names of the following compounds? NH3, Na2O, CaO.

The gaseous products that are formed when gun powder is subjectd to heating are dissolved in water. Indentify the products formed on dissolution.A. `H_(2)CO_(3), HNO_(3)`B. `H_(2)SO_(3), H_(2)SO_(4)`C. `H_(2)SO_(4), HNO_(2)`D. `H_(2)SO_(3), H_(2)CO_(3)`

Gaseous products formed when gun powder is subjected to heating are dissolved in water. Identify the products formed on dissolution.A. `H_(2)CO_(3), HNO_(3)`B. `H_(2)SO_(3), H_(2)SO_(4)`C. `H_(2)SO_(4), HNO_(2)`D. `H_(2)SO_(3), H_(2)CO_(3)`

Name the substances formed by the dissolution of following oxides in water. (a) `CO_(2)` (b) MgO

Name any two bases with their acidity 1 (monoacidic)

Define acidity of bases.

Define Basicity of acids.

Name any two acids with their basicity 1 (monobasic)

Identify the odd one out and justify.Calcium oxide, magnesium oxide, zinc oxide, sodium oxide.

Give examples of monobasic, dibasic and tribasic acids.

Write down the changes that will be seen in each instance and explain the reason behind it.50ml water is added to 50ml solution of copper sulphate.

Identify the odd one out and justify.Sodium nitrate, sodium carbonate, sodium sulphate, sodium chloride

Identify the odd one out and justify.(a) Chloride, nitrate, hydride, ammonium

H2CO3 is …………………. acid. (a) monobasic (b) dibasic (c) tribasic(d) tetrabasic

Identify the odd one out and justify.Sodium chloride, potassium hydroxide, acetic acid, sodium acetate.

Identify the odd one out and justify.Ammonium chloride, sodium chloride, potassium nitrate, sodium sulphate

Identify the odd one out and justifyHydrogen chloride, sodium hydroxide, calcium oxide, ammonia

H3PO4 is a …………………. acid. (a) monobasic (b) tribasic (c) tetrabasic (d) dibasic

Match the columns:Column ‘A’Column’B’(1) Urine(a) Butyric acid(2) Apples(b) Uric acid(3) Orange(c) Malic acid(4) Butter(d) Citric acid

How are the following substances classified into three groups with the help of litmus?Lemon, tamarind, baking soda, buttermilk, vinegar, orange, milk, lime, tomato, milk of magnesia, water, alum.