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

11th Standard

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Chemistry

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

25 x 1 = 25
1. Consider the following statements regarding Rutherford's $\alpha$-ray scattering experiment.
i. Most of the $\alpha$-particles were deflected through a small angle.
ii. Some of $\alpha$-particles passed through the foil.
iii. Very few $\alpha$-particles were reflected back by 180o.
Which of the above statements is/are not correct.

(a)

i and ii

(b)

ii and iii

(c)

i and iii

(d)

i, ii and iii

2. The element which does not contain a neutron is

(a)

hydrogen

(b)

helium

(c)

chlorine

(d)

none of the above

3. Which of the following is named as perhydrol and used as an antiseptic?

(a)

D2O

(b)

H2O2

(c)

NaH

(d)

B2H6

4. Which of the following is insoluble in water?

(a)

LiF

(b)

NaCI

(c)

KBr

(d)

NaBr

5. Which one of the following is more basic?

(a)

Ca(OH)2

(b)

Mg(OH)2

(c)

NaOH

(d)

AI(OH)3

6. Which of the following is used as a coolant in fast breeder nuclear reactor?

(a)

Liquid ammonia

(b)

Liquid helium

(c)

Liquid Na metal

(d)

Solid CO2

7. Which one of the following is used in fire extinguishers?

(a)

Washing soda

(b)

Soda ash

(c)

Baking soda

(d)

Caustic soda

8. The instrument used for measuring atmospheric pressure is ________________

(a)

Beckmann thermometer

(b)

Galvanometer

(c)

Barometer

(d)

all the above

9. The mathematical expression V$\infty$ n relates to _____________

(a)

Boyle's law

(b)

Charles law

(c)

(d)

Gay Lusassc's law

10. Temperature at which gas behave ideally over a wide range of pressure is called as

(a)

Inversion temperature

(b)

Boyle's temperature

(c)

Critical temperature

(d)

None of these

11. What is the dominant intermolecular force or bond that must be overcome in converting liquid methanol to a gas?

(a)

London dispersion force

(b)

Hydrogen bonding

(c)

Dipole-dipole interaction

(d)

Covalent bonds

12. Which mixture of gases at room temperature does not obey Dalton's law of partial pressure?

(a)

NO2 and O2

(b)

SO2 and SO3

(c)

CO and CO2

(d)

NH3 and HCI

13. Vanderwaal's constant a and b are related with  ______________ respectively

(a)

attractive force and volume of molecules.

(b)

repulsive force and volume of molecules

(c)

attractive force and bond energy of molecules.

(d)

shape and repulsive force of molecules

14. The liquefaction behaviour of temporary gases like CO2 approaches that of N2, O2 (permanent gases) as we go,

(a)

below critical temperature

(b)

above critical temperature

(c)

below absolute zero

(d)

above absolute zero

15. The density of neon will be highest at:

(a)

STP

(b)

0°C, 2 atm

(c)

273°C, 1 atm

(d)

273°C, 2 atm

16. At constant temperature, the pressure of the gas is reduced to one-third, the volume ________.

(a)

reduce to one-third

(b)

increases by three times

(c)

remaining the same

(d)

cannot be predicted

17. Which of the following is a diatomic gas in nature?

(a)

Oxygen

(b)

Ozone

(c)

Helium

(d)

18. The standard atmospheric pressure at sea level at 0oC is equal to _____________.

(a)

1 mm Hg

(b)

76 mm Hg

(c)

760 mm Hg

(d)

680 mm Hg

19. The value of critical temperature of carbon dioxide is _________.

(a)

273 K

(b)

303.98 K

(c)

373 K

(d)

-80o C

20. The molecules of a gas A travel four times faster than the molecules of gas B at same temperature. The ratio of molecular weight MA / MB is _________.

(a)

1/16

(b)

4

(c)

1/4

(d)

16

21. When solid melts there is:

(a)

an increase of entropy

(b)

a decrease in entropy

(c)

an increase in free energy

(d)

an increase of heat of fusion

22. Which of these represents the correct order of their increasing bond order

(a)

\(C_2

(b)

\(C_2^{2-}

(c)

\(O_2^{2-}

(d)

\(O_2^{2-}

23. Which one of the following names does not fit a real name?

(a)

3 – Methyl –3–hexanone

(b)

4–Methyl –3– hexanone

(c)

3– Methyl –3– hexanol

(d)

2– Methyl cyclo hexanone

24. Assertion:  is 3– carbethoxy -2- butenoicacid
Reason: The principal functional group gets lowest number followed by double bond (or) triple bond.

(a)

both the assertion and reason are true and the reason is the correct explanation of assertion

(b)

both assertion and reason are true and the reason is not the correct explanation of assertion

(c)

ssertion is true but reason is false

(d)

both the assertion and reason are false