#### 11th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Nine

11th Standard

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Chemistry

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

25 x 1 = 25
1. When 6.3g of sodium bicarbonate is added to 30g of the acetic acid solution, the residual solution is found to weigh 33g. The number of moles of carbon dioxide released in the reaction is

(a)

3

(b)

0.75

(c)

0.075

(d)

0.3

2. Which of the following is/are true with respect to carbon -12

(a)

relative atomic mass is 12 u

(b)

the oxidation number of carbon is +4 in all its compounds.

(c)

1 mole ofcarbon-12 contain 6.022 x 1022 carbon atoms.

(d)

All of these

3. If a beaker holds 576g of water, what will be the gram molecules of water in that beaker?

(a)

23 gram molecule

(b)

23%

(c)

32%

(d)

32 gram molecule

4. In redox reaction which of the following Is true?

(a)

Number of electrons lost is more than number of electrons gained

(b)

Number of electrons lost is less than number of electrons gained

(c)

Number of electrons lost is equal number of electrons gained

(d)

No transfer and gain of electrons during the reaction.

5. Consider the following statements
1.$\lambda$ .= h / mv is valid only when the particle travels at speed much less than the speed of light.
2. Einstein's mass-energy relationship is E=mc2
3. The angular momentum (mvr) ofthe electron must be equal to an integral multiple of h/4$\pi$ . Which of the following statementts) given above is/ are correct?

(a)

1&3

(b)

Only 1

(c)

1 & 2

(d)

1, 2 & 3

6. What would be the formula of the compound formed by A and B, where A has the valence 3 and B has the valence 3?

(a)

AB

(b)

AB3

(c)

A3B

(d)

3AB3

7. The first ionisation potential ofNa is 5.1 eY. The value of electron gain enthalpy is

(a)

+2.55 eV

(b)

-2.55 eV

(c)

-5.1 eV

(d)

-10.2 eV

8. The half life period of Tritium is ___________

(a)

12.33 secs

(b)

12.33 mins

(c)

12.33 hrs

(d)

12.33 years

9. Which one of the following is used to study the movements of ground water?

(a)

Deuterium

(b)

Protium

(c)

Tritium

(d)

HD

10. Which of the following does not have any effect with water?

(a)

Sodium

(b)

Iron

(c)

(d)

Mercury

11. The hydration enthalpies of alkali metal ions decreases in ______ order.

(a)

Li+ > Na+ > K+ > Rb+ > Cs+

(b)

Cs+ > Rb+ > K+ > Na+ > Li+​​​​​​​

(c)

Li+ > Rb+ > K+ > Na+ > Cs+​​​​​​​

(d)

Rb+ > Cs+ > K+ > Na+ > Li+

12. Which of the following halides has the highest melting point?

(a)

NaF

(b)

NaCI

(c)

NaBr

(d)

NaI

13. Compounds of alkaline earth metals are less soluble in water than the corresponding alkali metals salts due to :

(a)

their increased covalent character

(b)

high lattice energy

(c)

their high ionization energy

(d)

none of the above

14. Consider the following statements.
(i) Superoxides of alkali metals are diamagnetic.
(ii) Superoxides of alkali metals are blue in colour.
(iii) Superoxides of alkali metals are paramagnetic.
Which of the above statements is/are not correct?

(a)

(i) only

(b)

(ii) only

(c)

(iii) only

(d)

(i) and (ii)

15. In fire works, red colour flash is produced by ________

(a)

Ba

(b)

Ra

(c)

Sr

(d)

Rb

16. Which of the following is not a peroxide?

(a)

KO2

(b)

CrO5

(c)

Na2O2

(d)

BaO2

17. Which of the following is used in making armour plates?

(a)

Lithium + magnesium

(b)

Lithium + aluminium

(c)

(d)

Sodium + lithium

18. The measure of attractive forces of molecules is called ________________

(a)

internal pressure

(b)

cohesion pressure

(c)

both (a) and (b)

(d)

neither (a) nor (b)

19. Among the following groups which contains monoatomic gases?

(a)

Group 17

(b)

Group 18

(c)

Group 1

(d)

Group 15

20. The temperature below which a gas obey Joule Thomson effect is called __________.

(a)

critical temperature

(b)

standard temperature

(c)

inversion temperature

(d)

normal temperature

21. A fundamental goal of thermodynamics is the prediction of ------ of the process.

(a)

reversibility

(b)

rate

(c)

spontaneity

(d)

none of these

22. The formation of ammonia from N2(g) and H2(g) is a reversible reaction
N2(g) + 3H2(g) ⇌ 2NH3(g) + Heat
What is the effect of increase of temperature on this equilibrium reaction

(a)

equilibrium is unaltered

(b)

formation of ammonia is favoured

(c)

equilibrium is shifted to the left

(d)

reaction rate does not change

23. The blocking of capillaires due to sudden release of bubbles of N2 gas in blood is known as

(a)

bends

(b)

blends

(c)

mends

(d)

all of these

24. Which one of the following is a homogeneous mixture?

(a)

Sea water

(b)

Air

(c)

Alloys

(d)

All the above

25. Ethylidene chloride on treatment with aqueous KOH gives

(a)

acetaldehyde

(b)

ehtyleneglycol

(c)

formaldehyde

(d)

glycoxal