Important Chemical Reactions and Processes CDS Questions

CDS Chemistry

Important Chemical Reactions and Processes MCQ Questions


1.
The oxidation number of sulfur in H2SO4 is ________
A.
4
B.
-4
C.
6
D.
-6
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ANSWER :
C. 6
2.

How many milliliters of 0.5 M H2SO4 are needed to dissolve 0.5 g of copper(II)carbonate?

A.

5.2

B.

5.6

C.

8.1

D.

6.6

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ANSWER :

C. 8.1

3.

In the reaction 2MnO4- + 5H2C2O4 + 6H+ → 2Mn2+ + 10CO2 + 8H2O, which species is reduced?

A.

CO

B.

CO2

C.

HNO3

D.

H2C2O4

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ANSWER :

D. H2C2O4

4.
One mole of N2H4 loses ten moles of electrons to form a new compound A. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in A? (There is no change in the oxidation state of hydrogen.)
A.
-3
B.
3
C.
2
D.
-1
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ANSWER :
B. 3
5.

Which of the following is a reducing agent?

A.

Al-

B.

Cl2

C.

CO2

D.

HNO

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ANSWER :

B. Cl2

6.

In the reaction Al + HCl → AlCl3 + H2, which species is oxidized?

A.

Al

B.

HCl

C.

H2

D.

AlCl3

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ANSWER :

A. Al