#### Basic Concepts of Chemistry and Chemical Calculations One Mark Questions

11th Standard

Reg.No. :
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Chemistry

Time : 01:00:00 Hrs
Total Marks : 20

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20 x 1 = 20
1. 40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left after cooling to room temperature is _______.

(a)

40 ml CO2 gas

(b)

40 ml CO2 gas and 80 ml H2O gas

(c)

60 ml CO2 gas and 60 ml H2O gas

(d)

120 ml CO2 gas

2. The number of water molecules in a drop of water weighing 0.018 g is _____.

(a)

6.022$\times$1026

(b)

6.022$\times$1023

(c)

6.022$\times$1020

(d)

9.9$\times$1022

3. Fe2 + $\longrightarrow$ Fe3+ + e- is a ________ reaction.

(a)

redox

(b)

reduction

(c)

oxidation

(d)

decomposition

4. The oxidation number of hydrogen in LiH is _________

(a)

+1

(b)

-1

(c)

+2

(d)

-2

5. Which one of the following represents 180g of water?

(a)

5 Moles of water

(b)

90 moles of water

(c)

$\frac { 6.022\times { 10 }^{ 23 } }{ 180 }$ molecules of water

(d)

6.022$\times$1024molecules of water

6. Rusting of iron articles is an example of ___________ reaction

(a)

Combustion

(b)

decomposition

(c)

redox

(d)

hydrolysis

7. Two 22.4 litre containers A and B contains 8 g of O2 and 8 g of SO2 respectively at 273 K and 1 atm pressure, then ______.

(a)

Number of molecules inA and B are same

(b)

Number of molecules in B is more than that in A.

(c)

The ratio between the number of molecules in A= to number of molecules in B is 2:1

(d)

Number of molecules in B is three times greater than the number of molecules in A

8. Which one of the following is used as a standard for atomic mass?

(a)

6C12

(b)

7C12

(c)

6C13

(d)

6C14

9. Maximum oxidation state is present in the central metal atom of which compound

(a)

CrO2Cl2

(b)

MnO2

(c)

[Fe(CN)6]3-

(d)

MnO

10. In which of the following reactions, hydrogen peroxide acts as an oxidising agent?

(a)

I2+ H2O2 + 20H- $\longrightarrow$ 21- + 2H2O + O2

(b)

PbS + 4H2O2 $\longrightarrow$ PbSO4 + 4H2O

(c)

2MnO4-+ 3H2O2 $\longrightarrow$ 2MnO2 + 3O2 + 2H2O + 2OH-

(d)

HOCI + H2O2 $\longrightarrow$ H2O+ + Cl- + O2

11. The solid state of matter is converted into gas by

(a)

sublimation

(b)

deposition

(c)

freezing

(d)

condensation

12. Which form of based on physical characteristics possess neither definite volume nor definite shape?

(a)

Solids

(b)

Liquids

(c)

Gases

(d)

Both (a) and (b)

13. Atomicity of nitrogen is __________.

(a)

1

(b)

2

(c)

3

(d)

Zero

14. Calculate the percentage of N in ammonia molecule.

(a)

121.42%

(b)

28.35%

(c)

82.35%

(d)

28.53%

15. The equivalent mass of potassium permanganate in alkaline medium is:
MnO4- + 2H2O + 3e-$\rightarrow$ MnO2 + 4OH-

(a)

31.6

(b)

52.7

(c)

79

(d)

None of these

16. Which of the following has the highest mass?

(a)

1 g atom of C

(b)

1/2 mole of CH4

(c)

10 ml of water

(d)

3.011 x 1023 atoms of oxygen

17. The mass of an atom of nitrogen is _______________.

(a)

$\frac { 14 }{ 6.023\times { 10 }^{ 23 } }$

(b)

$\frac { 28 }{ 6.023\times { 10 }^{ 23 } }$

(c)

$\frac { 1 }{ 6.023\times { 10 }^{ 23 } }$

(d)

14 amu

18. Which of the following halogens do not exhibit positive oxidation number in its compounds?

(a)

Fluorine

(b)

Chlorine

(c)

Iodine

(d)

Bromine

19. Which of the following is the most powerful oxidising agent?

(a)

KMnO4

(b)

K2Cr2O7

(c)

O3

(d)

H2O2

20. On the reaction 2Ag + H2SO4 $\rightarrow$ Ag2SO4 + 2H2O + SO2.Sulphuric acid acts as ____________.

(a)

oxidising agent

(b)

reducing agent

(c)

a catalyst

(d)

an acid as well as an oxidant

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