General Science MCQ – 150 (Chemistry)

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1. The total of the oxidation number in an element is?
(A) Charge
(B) Volatility
(C) Reduction
(D) Oxidation

2. The reduction is a gain of?
(A) Electrons
(B) Protons
(C) Neutros
(D) Oxygen

3. Which of the following is not a reduction agent?
(A) CO2
(B) SO2
(C) NO2
(D) ClO2

4. A number that is assigned to each atom or ion in a compound that explains its degree of oxidation is called?
(A) Oxidation state only
(B) Oxidation number
(C) Oxidation degree only
(D) Oxidation state and number

5. The gain of oxygen is known as?
(A) Oxidation
(B) Reduction
(C) Halogenation
(D) Chlorination

6. Which of the following undergoes a maximum change in its oxidation number, when a mixture of oxalic acid, potassium chlorate and sulphuric acid is heated?
(A) S
(B) Cl
(C) H
(D) C

7. The oxidation number for oxygen will always be?
(A) 2
(B) -2
(C) 1
(D) -1

8. The reduction is the decrease in?
(A) Oxidation number
(B) Charge
(C) Solubility
(D) None of the above

9. The reaction in which oxidation and reduction take place at the same time is called?
(A) Redox reaction
(B) Oxidation reaction
(C) Reduction reaction
(D) None of the above

10. Hydrogen is used for making?
(A) Margarine only
(B) Ammonia only
(C) Salts
(D) Margarine and ammonia both

General Science MCQ – 149 (Biology)