#### 11th Standard Chemistry English Medium Free Online Test Volume 1 One Mark Questions with Answer Key 2020

11th Standard

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Chemistry

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

25 x 1 = 25
1. Which of the following compound(s) has /have a percentage of carbon same as that in ethylene (C2H4)

(a)

propene

(b)

ethyne

(c)

benzene

(d)

ethane

2. Atomicity of nitrogen is

(a)

1

(b)

2

(c)

3

(d)

Zero

3. The empirical formula of Alkene is _______________

(a)

CH

(b)

CH2

(c)

CH3

(d)

CH2O

4. Which of the following does not represent the mathematical expression for the Heisenberg uncertainty principle?

(a)

$\triangle x.\triangle p\ge \frac { h }{ 4\pi }$

(b)

$\triangle x.\triangle v\ge \frac { h }{ 4\pi m }$

(c)

$\triangle E.\triangle t\ge \frac { h }{ 4\pi }$

(d)

$\triangle E.\triangle x\ge \frac { h }{ 4\pi }$

5. ${ \Psi }^{ 2 }$ = 0 represents:

(a)

a node

(b)

an orbital

(c)

angular wave function

(d)

wave function

6. Characteristic of transition elements is incomplete

(a)

d-orbitals

(b)

f-orbitals

(c)

p-orbitals

(d)

s-orbitals

7. Statement-I: Ionization enthalpy of Be is greater than that of B.
Statement-:II: The nuclear charge of B is greater than that of Be.

(a)

Statement-I and II are correct and statement-II is the correct explanation of statement-I.

(b)

Statement-I and statement-II are correct but statement-II is not the correct explanation of statement-I.

(c)

Statement-I is correct but statement-II is wrong.

(d)

Statement-I is wrong but statement-II is correct.

8. Which one of the following is true about metallic character when we move from left to right in a period and top to bottom in a group?

(a)

Decreases in a period and increases along the group

(b)

Increases in a period and decreases in a group

(c)

Increases both in the period and the group

(d)

Decreases both in the period and in the group

9. When hydrogen peroxide is shaken with an acidified solution of potassium dichromate in presence of ether, the ethereal layer turns blue due to the formation of

(a)

Cr2O3

(b)

${ CrO }_{ 4 }^{ 2- }$

(c)

CrO(O2)2

(d)

none of these

10. When sodium peroxide is treated with dilute sulphuric acid.the products are

(a)

sodium sulphate and water

(b)

sodium sulphate and oxygen

(c)

sodium sulphate, hydrogen and oxygen

(d)

sodium sulphate and hydrogen peroxide

11. Which one of the following does not have intramolecular hydrogen bonding?

(a)

water

(b)

o-nitrophenol

(c)

Salicylaldehyde

(d)

Salicylic acid

12. Which of the following has highest hydration energy

(a)

MgCl2

(b)

CaCl2

(c)

BaCl2

(d)

SrCI2

13. Alkaline earth metals belong to _____ group of the periodic table

(a)

1

(b)

2

(c)

17

(d)

18

14. Which of the following is insoluble in water?

(a)

LiF

(b)

NaCI

(c)

KBr

(d)

NaBr

15. When caesium salt is subjected to flame test, the colour produced is

(a)

lilac

(b)

yellow

(c)

blue

(d)

crimson red

16. The absolute zero is _____________

(a)

-273oC

(b)

273oC

(c)

OK

(d)

both a and c

17. Match the list I with list II and select the correct answer using the code given below.

 List-I List-II A. Permanent Gas 1. 2a/Rb B. Temporary Gas 2. N2 C. Ti 3. low Tc D. Joule Thomson Effect 4. NH3
(a)
 A B C D 2 3 4 1
(b)
 A B C D 4 1 2 3
(c)
 A B C D 1 2 3 4
(d)
 A B C D 3 4 1 2
18. If 'Z' is a compressibility factor, Vander waals equation at low pressures can be written as:

(a)

$Z=1+\frac{Pb}{RT}$

(b)

$Z=1+\frac{RT}{Pb}$

(c)

$Z=1-\frac{a}{VRT}$

(d)

$Z=1-\frac{Pb}{RT}$

19. The scope of the plot between PV and P at constant temperature is

(a)

zero

(b)

1

(c)

$\frac{1}{2}$

(d)

$\frac{1}{\sqrt2}$

20. Which of the following pairs of gases will diffuse at the same time through a porus plug?

(a)

CO, NO2

(b)

NO, C2H6

(c)

NO2, CO2

(d)

NH3,PH3

21. The process in which no heat can flow into or out of the system are called ----- process.

(a)

isothermal

(b)

isobasic

(c)

isochoric

(d)

22. For the reaction H2+I2 $\leftrightharpoons$2HI, $\Delta$H = 12.40 Kcal the heat of formation of HI is:

(a)

12.4 Kcal mol-1

(b)

-12.4 Kcal mol-1

(c)

-6.20 Kcal mol-1

(d)

6.20 Kcal mol-1

23. Which one of the following is an example for closed system?

(a)

Hot water contained in a thermos flask

(b)

A gas contained in a cylinder fitted with a piston

(c)

All living things

(d)

Hot water contained in a open beaker

24. Consider the following statements.
(i) Work is a state function.
(ii) Work brings a temporary effect in the surroundings.
(iii) Work appears only at the boundary of the system.
Which of the above statements is/are not correct?

(a)

(iii) only

(b)

(i) and (ii)

(c)

(i) and (iii)

(d)

(ii) and (iii)

25. In which of the following entropy decreases?

(a)

melting of ice

(b)

evaporation of water

(c)

crystallization of sugar

(d)

dissolution of salt