NCERT Class X Science Class: Chapter –2. Acids, Bases and Salts – Part-6

Download PDF of This Page (Size: 170K)

Short Answer Questions

Question 31:

Match the acids given in Column (A) with their correct source given in Column (B)

Acids and Source (Q)
Acids and Source (Q)

Column (A)

Column (B)

A.

Lactic acid

i.

Tomato

B.

Acetic acid

ii.

Lemon

C.

Citric acid

iii.

Vinegar

D.

Oxalic acid

iv.

Curd

Answer:

Acids and Source (A)
Acids and Source (A)

Column (A)

Column (B)

A.

Lactic acid

iv.

Curd

B.

Acetic acid

iii.

Vinegar

C.

Citric acid

ii.

Lemon

D.

Oxalic acid

i.

Tomato

Question 32:

Match the important chemicals given in Column (A) with the chemical formulae given in Column (B)

Match the Column (A) and Column (B) (Q)
Match the Column (A) and Column (B) (Q)

Column (A)

Column (B)

A.

Plaster of Paris

i.

B.

Gypsum

ii.

C.

Bleaching Powder

iii.

D.

Slaked Lime

iv.

Answer:

Match the Column (A) and Column (B) (A)
Match the Column (A) and Column (B) (A)

Column (A)

Column (B)

A.

Plaster of Paris

ii.

B.

Gypsum

iii.

C.

Bleaching Powder

iv.

D.

Slaked Lime

i.

Question 33:

What will be the action of the following substances on litmus paper? Dry gas, Moistened gas, Lemon juice, carbonated soft drink, Curd, Soap solution.

Answer:

Action on Litmus Paper
Action on litmus paper

Substance

Action on litmus paper

Dry gas

No change

Moistened gas

Turns red to blue

Lemon juice

Turns blue to red

Carbonated soft drink

Turns blue to red

Curd

Turns blue to red

Soap solution

Turns red to blue

Question 34:

Name the acid present in ant sting and give its chemical formula. Also give the common method to get relief from the discomfort caused by the ant sting.

Answer:

The acid present in ant sting is Methanoic acid (formic acid). The chemical formula is . To get relief one should apply any available basic salt e.g., baking soda on it.

Image Structure of methanoic acid (formic acid).

Image Structure of Methanoic Acid (Formic Acid).

Image Structure of methanoic acid (formic acid).

Question 35:

What happens when nitric acid is added to egg shell?

Answer:

Egg shells contain calcium carbonate. When nitric acid is added to it, carbon dioxide gas is evolved. Same reaction happens when nitric acid is poured over egg shell. The reaction can be given as