#### 11th Standard Chemistry English Medium Free Online Test One Mark Questions with Answer Key 2020 - Part Eight

11th Standard

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Chemistry

Time : 00:25:00 Hrs
Total Marks : 25

25 x 1 = 25
1. Atoms are too small with a diameter of 10-10 m and weigh approximately

(a)

10-27 kg

(b)

10-27 g

(c)

10-31 kg

(d)

10-31

2. The fixed circular paths around the nucleus are caused _

(a)

orbits

(b)

Orbitals

(c)

nucleons

(d)

Mesons

3. Which of the following is Dobereiner's triad?

(a)

Ne,Ca,Na

(b)

H2, N2, O2

(c)

Li, Na, K

(d)

Na, Br, K

4. The atomic weight of Au is ______

(a)

195

(b)

197

(c)

198

(d)

196

5. The vertical columns in the periodic table are called as

(a)

family

(b)

group

(c)

period

(d)

both (a) and (c)

6. ______ is the lightest metal known.

(a)

Na

(b)

Li

(c)

Mg

(d)

Al

7. Which of the following does not have zero electron gain enthalpy?

(a)

Be

(b)

Cl

(c)

Mg

(d)

N

8. Which of the following statements related to the modern periodic table is incorrect?

(a)

The p-block has 6 columns, because a maximum of 6 electrons can occupy all the orbitals in a p-subshell.

(b)

The d-block has 8 columns, because a maximum of 8 electrons can occupy all the orbitals in a d-subshell.

(c)

Each block contairis a number of columns equal to the number of electrons that can occupy that subshell.

(d)

The block indicates value of azimuthal quantum number (1) for the last subshell that received electrons in building up the electronic configuration.

9. Among the following elements, which has the least electron affinity?

(a)

Phosphorous

(b)

Oxygen

(c)

Sulphur

(d)

Nitrogen

10. Which of the following mixture of gases is called water gas?

(a)

CO2(g)+ H2(g)

(b)

CO(g)+ N2(g)

(c)

CO(g)+ H2(g)

(d)

N2(g)+ H2(g)

11. In case of alkali metal halides, the ionic character increases in the order

(a)

MF < MCI < MBr < MI

(b)

MI < MBr < MCI < MF

(c)

MI < MBr<MF < MCI

(d)

none of these

12. Which of the following oxides is the most basic in nature?

(a)

Na2O

(b)

BeO

(c)

Li2O

(d)

H2O

13. Which hydroxide decomposes on heating?

(a)

NaOH

(b)

RbOH

(c)

KOH

(d)

LiOH.

14. The radioactive element of group 2 element is ______

(a)

Strontium

(b)

(c)

Beryllium

(d)

Francium

15. _______ is unstable in air and is kept in CO2 atmosphere to avoid decomposition.

(a)

BeCO3

(b)

MgCO3

(c)

CaCO3

(d)

BaCO3

16. Identify the correct statements about barium.
(i) It shows photoelectric effect
(ii) It is silvery white metal
(ill) It forms Ba(NO3)2 which is used in preparation of green tire

(a)

Both (i) and (iii)

(b)

(ii) and (iii)

(c)

Only (ii)

(d)

(i),(ii),(iii)

17. Gypsum is _________

(a)

CaSO4.H2O

(b)

CaSO4.1/2H2O

(c)

CaSO4.1/4H2O

(d)

CaSO4.2H2O

18. Celestite and strontianite are the ores of ______

(a)

cesium

(b)

strontium

(c)

magnesium

(d)

barium

19. Which metal is used in making electrochemical cells?

(a)

Caesium

(b)

Lithium

(c)

Calcium

(d)

Barium

20. Which one of the following is used for mercerising cotton fabrics?

(a)

KOH

(b)

NaOH

(c)

Na2CO3

(d)

NaHCO3

21. Absolute zero is,

(a)

-273oC

(b)

0 K

(c)

temperature at which no substance exists in gaseous state

(d)

all of these

22. Identify the correct mathematical expression of Graham's law of diffusion.

(a)

$\frac { { r }_{ 2 } }{ { r }_{ 1 } } =\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } }$

(b)

${ r }_{ 1 }r_{ 2 }=\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } }$

(c)

$\frac { { r }_{ 1 } }{ { r }_{ 2 } } =\sqrt { \frac { { M }_{ 2 } }{ { M }_{ 1 } } }$

(d)

$\frac { { r }_{ 1 } }{ { r }_{ 2 } } ={ \left[ \frac { { M }_{ 2 } }{ { M }_{ 1 } } \right] }^{ 2 }$

23. Equimolal aqueous solutions of NaCl and KCl are prepared. If the freezing point of NaCl is –2oC, the freezing point of KCl solution is expected to be

(a)

-2oC

(b)

-4oC

(c)

-1oC

(d)

0oC

24. Which one of the following is non aromatic?

(a)

(b)

(c)

(d)

25. Bhopal Gas Tragedy is a case of _____________

(a)

thermal pollution

(b)

air pollution

(c)

nuclear pollution

(d)

land pollution