Student Corner

1. The oxidation state of manganese (Mn) in KMnO₄ is:

A. +2

B. -2

C. +7

D. -7

Ans: C

2. The element whose oxidation state in its every compound is same:

A. Carbon

B. Fluorine

C. Hydrogen

D. Oxygen

Ans: B

3. The oxidation state of oxygen in OF₂ is:

A. +2

B. -2

C. +1

D. -1

Ans: A

4. The acid is a substance which:

A. Accepts (gains) electron

B. Donates electrons

C. Provides (donates) proton

D. Donates OH- ion

Ans: C

5. The alkali is a substance which:

A. Provides (donates) proton

B. Accepts proton

C. Donates electron

D. Accepts electron pair

Ans: B

GK descriptive Questions and Answers on Biotechnology

6. The substance which makes the blue litmus paper red is :

A. Acid

B. Base

C. Alkali

D. Salt

Ans: A

7. The substance which makes the red litmus paper blue is:

A. Acid

B. Alkali

C. Salt

D. None of these

Ans: B

8. The first time pH value measurement is done by:

A. Leviatiae

B. Pristley

C. Cauvendish

D. Sorensan

Ans: D

9. The average pH value of the human blood is:

A. 5.4

B. 6.2

C. 7.4

D. 8.7

Ans: C

10. The average pH value of the milk is:

A. 6.1

B. 6.6

C. 7.4

D. 8

Ans:  B