76 + Interview Questions in ACID IN GENERAL AWARENESS Page 2 InterviewSolution

51.	Fill in the blanks in the following sentences: (a). Acids have a ______taste and they turn_____litmus to _____ (b). Substnaces do not show their acidic properties without_____ (c). Acids produce______ions on dissolving in water. (d). Those substnaces whose smell (or odour) changes in acidic or basic solution are called _______indicators. (e). Onion and vanilla extract are_____Indicators.
Answer» (a). Sour, blue, red (b) water (c) hydrogen 9d) olfactor (e) olfactory

Discussion

52.	Fill in the following blanks with suitable words (a). Acids have a pH____than 7. (b). Allalis have a pH_____than 7. (c). Neutral substnaces have a pH of _____ (d) the more acidic a solution, the _____the pH. (e). The more alkaline a solution, the _______the pH.
Answer» (a). Lower (b). Higher (c) 7 (d) lower (e) higher

Discussion

53.	Hydrochloric acid reacts with a metal X to form a gas Y which burns with a pop sound. Sodium hydroxide solution also reacts with the same metal X (on heating) to form the same gas Y. (a) Name X and Y (b). Write the chemcial equation of the reaction of metal X with (i) hydrochloric acid, and (ii) sodium hydroxide solution.
Answer» (a) Metal X is zinc, gas Y is hydrogen

Discussion

54.	How is the concentration of hydroxide ions` (OH^(â€“))` affected when excess base is dissolved in a solution of sodium hydroxide?
Answer» On dissolving more sodium hydroxide base in the same solutiion, the concentration of hydroxide ions `(OH^(-))` increases.

Discussion

55.	Find the odd one out and justify:Acetic acid, carbonic acid, hydrochloric acid, nitric acid.
Answer» Acetic acid. (Others are mineral acids.)

Discussion

56.	Find the odd one out and justify:Hydrogen chloride, sodium hydroxide, calcium oxide, ammonia.
Answer» Hydrogen chloride. (Others are bases.)

Discussion

57.	Find the odd one out and justify:NaOH, Ca(OH)2 , NH4OH, Ba(OH)2
Answer» NaOH (Others are weak bases.)

Discussion

58.	Find the odd one out and justify:H2SO4 , H2CO3 , HCl, HNO3
Answer» H₂CO₃ (Others are strong acids.)

Discussion

59.	Find the odd one out and justify:HCl, CH3COOH, H2SO4 , HNO3
Answer» CH₃COOH. (Others are strong acids.)

Discussion

60.	Write the chemical names from given formulae:H2SO4 , Ca(OH)2 , HCl, NaOH, KOH, NH4 OH
Answer» 1. H₂SO₄– Sulphuric acid 2. Ca(OH)₂ – Calcium hydroxide 3. HCl – Hydrochloric acid 4. NaOH – Sodium hydroxide 5. KOH – Potassium hydroxide 6. NH₄OH – Ammonium hydroxide

60.

Write the chemical names from given formulae:H2SO4 , Ca(OH)2 , HCl, NaOH, KOH, NH4 OH

Answer»

1. H₂SO₄– Sulphuric acid

2. Ca(OH)₂ – Calcium hydroxide

3. HCl – Hydrochloric acid

4. NaOH – Sodium hydroxide

5. KOH – Potassium hydroxide

6. NH₄OH – Ammonium hydroxide

Discussion

61.	State names of any three alkalis.
Answer» 1. sodium hydroxide 2. potassium hydroxide 3. calcium hydroxide.

61.

State names of any three alkalis.

Answer»

1. sodium hydroxide

2. potassium hydroxide

3. calcium hydroxide.

Discussion

62.	State the names of three indicators.
Answer» 1. Litmus paper 2. Methyl orange 3. Phenolphthalein.

62.

State the names of three indicators.

Answer»

1. Litmus paper

2. Methyl orange

3. Phenolphthalein.

Discussion

63.	State three vegetables from which natural indicators can be prepared.
Answer» Natural indicators: Red cabbage, radish, tomato.

Discussion

64.	What are indicators?
Answer» Substances which change their colours in presence of acid or base are called indicators.

Discussion

65.	When lemonuice falls on a marble kitchen counter, which is the gas that bubbled out?
Answer» Carbon dioxide.

Discussion

66.	From which plant is litmus obtained?
Answer» Litmus is obtained from plants called lichens.

Discussion

67.	How will you neutralize the excess of acid present in the soil?
Answer» Lime stone or lime water is mixed in the soil to neutralize the excess of acid.

Discussion

68.	Name the antacid which is used to control the hyper acidity
Answer» Milk of magnesia [Mg(OH)₂ ] is used to control the hyper acidity.

Discussion

69.	State the properties of acids.
Answer» 1. Acids are sour in taste. 2. Acid molecules contain hydrogen ion (H⁺) as a main constituent. 3. Acid reacts with metal to form hydrogen gas. 4. Acid reacts with carbonates and liberates CO₂ gas. 5. Blue litmus turns red in acid.

69.

State the properties of acids.

Answer»

1. Acids are sour in taste.

2. Acid molecules contain hydrogen ion (H⁺) as a main constituent.

3. Acid reacts with metal to form hydrogen gas.

4. Acid reacts with carbonates and liberates CO₂ gas.

5. Blue litmus turns red in acid.

Discussion

70.	Why toothpaste is used for brushing teeth?
Answer» 1. Toothpaste contains fluorides and alkali to neutralize the mouth acid. 2. Hence, the tooth paste, which is generally alkaline, is used for cleaning the teeth as it can neutralize the excess acid in i the mouth and prevent tooth decay.

70.

Why toothpaste is used for brushing teeth?

Answer»

1. Toothpaste contains fluorides and alkali to neutralize the mouth acid.

2. Hence, the tooth paste, which is generally alkaline, is used for cleaning the teeth as it can neutralize the excess acid in i the mouth and prevent tooth decay.

Discussion

71.	Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid `(CH_(3)COOH)` is added to test tube B. Amount and concentration taken for both the acids are same. In which test tube will the fizzing occur more vigorously and why?
Answer» Hydrochloric acid (HCl) is a strong acid whereas acetic acid `(CH_(3)COOH)` is a weak acid. Being a strong acid, the hydrochloric acid solution contains a much greater amount of hydrogen ions in it due to which the fizzing will occur more vigorously in test-tube A (containing hydrochloric acid). the fizzing is due to the evolution of hydrogen gas which is formed by the action of acid on the magnesium metal (of magnesium ribbon).

Discussion

72.	Why do HCl, `HNO_(3)`, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?
Answer» The acidic character of a substance is due to the presence of hydrogen ion [`H^(+)` (aq) ions ] in its aqueous solution (water solution) `HCl` and `HNO_(3)` show acidic properties because they produce hydrogen ions when dissolved in water. The solutions of compounds like alcohol and glucose do not show acidic character because they do not ionise (or dissociate) in water to produce hydrogen ions.

Discussion

73.	Which of the following elements would form oxides which would indicate pH values less than seven, using moist pH paper ? Magnesium, carbon, sulphur, Hydrogen, copper.
Answer» Carbon and Sulphur, they form acidic oxides

Discussion

74.	A first-aid manual suggests that vinergar should be used to treat wasp stings and baking soda for bee stings. What does this information tell you about the chemical nature of: (a). Wasp stings? (b). Bee stings?
Answer» (a) Wasp stings are alkaline (b) Bee stings are acidic

Discussion

75.	A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution containsA. `NaCl`B. `HCl` solutionC. `LiCl`D. `KCl`
Answer» Correct Answer - HCl

Discussion

76.	(a) What is baking powder? How does it make the cake soft and spongy? (b). In additio to sodium hydrogencarbonate, baking powders contain a substance X. Name the substance X what is the role of substance X in the baking powder?
Answer» (b) substance X is tartaric acid

Discussion

Explore topic-wise InterviewSolutions in .

Fill in the following blanks with suitable words (a). Acids have a pH__than 7. (b). Allalis have a pH_than 7. (c). Neutral substnaces have a pH of _ (d) the more acidic a solution, the _the pH. (e). The more alkaline a solution, the _____the pH.

How is the concentration of hydroxide ions` (OH^(â€“))` affected when excess base is dissolved in a solution of sodium hydroxide?

Find the odd one out and justify:Acetic acid, carbonic acid, hydrochloric acid, nitric acid.

Find the odd one out and justify:Hydrogen chloride, sodium hydroxide, calcium oxide, ammonia.

Find the odd one out and justify:NaOH, Ca(OH)2 , NH4OH, Ba(OH)2

Find the odd one out and justify:H2SO4 , H2CO3 , HCl, HNO3

Find the odd one out and justify:HCl, CH3COOH, H2SO4 , HNO3

Write the chemical names from given formulae:H2SO4 , Ca(OH)2 , HCl, NaOH, KOH, NH4 OH

State names of any three alkalis.

State the names of three indicators.

State three vegetables from which natural indicators can be prepared.

What are indicators?

When lemonuice falls on a marble kitchen counter, which is the gas that bubbled out?

From which plant is litmus obtained?

How will you neutralize the excess of acid present in the soil?

Name the antacid which is used to control the hyper acidity

State the properties of acids.

Why toothpaste is used for brushing teeth?

Why do HCl, `HNO_(3)`, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Which of the following elements would form oxides which would indicate pH values less than seven, using moist pH paper ? Magnesium, carbon, sulphur, Hydrogen, copper.

A first-aid manual suggests that vinergar should be used to treat wasp stings and baking soda for bee stings. What does this information tell you about the chemical nature of: (a). Wasp stings? (b). Bee stings?

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution containsA. `NaCl`B. `HCl` solutionC. `LiCl`D. `KCl`

(a) What is baking powder? How does it make the cake soft and spongy? (b). In additio to sodium hydrogencarbonate, baking powders contain a substance X. Name the substance X what is the role of substance X in the baking powder?

Explore topic-wise InterviewSolutions in .

Fill in the following blanks with suitable words (a). Acids have a pH____than 7. (b). Allalis have a pH_____than 7. (c). Neutral substnaces have a pH of _____ (d) the more acidic a solution, the _____the pH. (e). The more alkaline a solution, the _______the pH.

How is the concentration of hydroxide ions` (OH^(â€“))` affected when excess base is dissolved in a solution of sodium hydroxide?

Find the odd one out and justify:Acetic acid, carbonic acid, hydrochloric acid, nitric acid.

Find the odd one out and justify:Hydrogen chloride, sodium hydroxide, calcium oxide, ammonia.

Find the odd one out and justify:NaOH, Ca(OH)2 , NH4OH, Ba(OH)2

Find the odd one out and justify:H2SO4 , H2CO3 , HCl, HNO3

Find the odd one out and justify:HCl, CH3COOH, H2SO4 , HNO3

Write the chemical names from given formulae:H2SO4 , Ca(OH)2 , HCl, NaOH, KOH, NH4 OH

State names of any three alkalis.

State the names of three indicators.

State three vegetables from which natural indicators can be prepared.

What are indicators?

When lemonuice falls on a marble kitchen counter, which is the gas that bubbled out?

From which plant is litmus obtained?

How will you neutralize the excess of acid present in the soil?

Name the antacid which is used to control the hyper acidity

State the properties of acids.

Why toothpaste is used for brushing teeth?

Why do HCl, `HNO_(3)`, etc., show acidic characters in aqueous solutions while solutions of compounds like alcohol and glucose do not show acidic character?

Which of the following elements would form oxides which would indicate pH values less than seven, using moist pH paper ? Magnesium, carbon, sulphur, Hydrogen, copper.

A first-aid manual suggests that vinergar should be used to treat wasp stings and baking soda for bee stings. What does this information tell you about the chemical nature of: (a). Wasp stings? (b). Bee stings?

A solution reacts with crushed egg-shells to give a gas that turns lime-water milky. The solution containsA. `NaCl`B. `HCl` solutionC. `LiCl`D. `KCl`

(a) What is baking powder? How does it make the cake soft and spongy? (b). In additio to sodium hydrogencarbonate, baking powders contain a substance X. Name the substance X what is the role of substance X in the baking powder?

Fill in the following blanks with suitable words (a). Acids have a pH__than 7. (b). Allalis have a pH_than 7. (c). Neutral substnaces have a pH of _ (d) the more acidic a solution, the _the pH. (e). The more alkaline a solution, the _____the pH.