EASY
UPSC CAPF AC Paper - I
IMPORTANT
Earn 100

When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is:

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Important Questions on Chemistry

EASY
UPSC CAPF AC Paper - I
IMPORTANT
The pH of fresh milk is 6. When it turns sour, the pH:
MEDIUM
UPSC CAPF AC Paper - I
IMPORTANT
The acid in gastric juice is _____.
EASY
UPSC CAPF AC Paper - I
IMPORTANT

Which of the following solutions will not change the colour of blue litmus paper to red?

I. Acid solution

II. Base solution

III. Common salt solution

Select the correct answer using the codes given below.

MEDIUM
UPSC CAPF AC Paper - I
IMPORTANT

Match the following Columns.

Column I (organic acids) Column II (natural sources)
A. Acetic acid 1. Curd
B. Lactic acid 2. Tamarind
C. Tartaric acid 3. Vinegar
D. Oxalic acid 4. Tomato

Codes:

MEDIUM
UPSC CAPF AC Paper - I
IMPORTANT

Statement I: Mixing concentrated acids or bases with water is a highly exothermic process.

Statement II: Water of crystallisation is the fixed number of water molecules chemically attached to each formula unit of a salt in its crystalline form.

HARD
UPSC CAPF AC Paper - I
IMPORTANT

Match the following Columns.

Column I Column II
A. Sodium hydroxide 1. For disinfecting water
B. Bleaching powder 2. For removing permanent hardness of water
C. Sodium hydrogen carbonate 3. In setting fractured bones
D. Washing soda 4. Soaps and detergents, paper making
E. Plaster of Paris 5. Soda-acid fire extinguisher

Codes:

EASY
UPSC CAPF AC Paper - I
IMPORTANT
Which one among the following is not a property of salt?
EASY
UPSC CAPF AC Paper - I
IMPORTANT
Vitamin- C is also known as: