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

11th Standard

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Chemistry

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

25 x 1 = 25
1. Two electrons occupying the same orbital are distinguished by

(a)

azimuthal quantum number

(b)

spin quantum number

(c)

magnetic quantum number

(d)

orbital quantum number

2. Halogens belong to the

(a)

s-block

(b)

p-block

(c)

d-block

(d)

Zero group of the periodic table

3. In the modern periodic table, the period indicates the value of____

(a)

atomic number

(b)

mass number

(c)

principal quantum number

(d)

azimuthal quantum number

4. Various successive ionisation enthalpies (in kJ mol-1) of an element are given below.

 IE1 IE2 IE3 IE4 IE5 577.5 1,810 2,750 11,580 14,820

The element is

(a)

phosphorus

(b)

Sodium

(c)

Aluminium

(d)

Silicon

5. In which.of the following reactions H2O2 act as a reducing agent?
(i)H2O2 + 2H+ + 2e $\rightarrow$ 2H2O
(ii) H2O2 - 2e $\rightarrow$ O2 + 2H+
(iii) H2O2 + 2e $\rightarrow$ 2OH-
(iv) H2O2 + 2OH- - 2e $\rightarrow$ O2 + 2H2O

(a)

(ii) and (iv)

(b)

(i) and (ii)

(c)

(iii) and (iv)

(d)

(i) and (iii)

6. 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

7. __________ is a group 2 element which shows diagonal relationship with aluminium

(a)

Be

(b)

Mg

(c)

Ca

(d)

Ba

8. The colour produced by potassium when burnt in Bunsen flame is ________

(a)

red

(b)

blue

(c)

green

(d)

lilac

9. Four gases P, Q, R and S have almost same values of 'b' but their 'a' values (a, b are Vander Waals Constants) are in the order Q < R < S < P. At a particular temperature, among the four gases the most easily liquefiable one is

(a)

P

(b)

Q

(c)

R

(d)

S

10. The unit of pressure is _____________

(a)

Pascal

(b)

Torr

(c)

Bar

(d)

all the above

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

(a)

Oxygen

(b)

Ozone

(c)

Helium

(d)

12. ΔG0 of reversible reaction at its equilibrium is

(a)

Positive

(b)

Negative

(c)

Always zero

(d)

Both (a) & (b)

13. When a liquid boils, there is:

(a)

increase in entropy

(b)

a decrease in entropy

(c)

increase in heat of vaporization

(d)

an increase in free energy

14. Which of the following is a state function?

(a)

q

(b)

$\Delta$q

(c)

w

(d)

$\Delta$S

15. Which one of the following is equal to 1 Joule?

(a)

Nm-1

(b)

Nm-2

(c)

Nm

(d)

kg ms-2

16. Match the List-I and List-II using the correct code given below the list.

 List-I List-II A. Cyclic process 1. ΔU=q-PΔV B. Adiabatic process 2. ΔU=qv C. Isobaric process 3. q=-w D. Isochoric process 4. ΔU=w
(a)
 A B C D 4 2 3 1
(b)
 A B C D 3 4 1 2
(c)
 A B C D 2 1 4 3
(d)
 A B C D 1 3 2 4
17. The heat of neutralization of a strong acid and strong base is around _____

(a)

+57.32 kJ

(b)

-57.32 kJ

(c)

-3227 kJ mol-1

(d)

+3227 kJ mol-1

18. Mathematically, the third law of thermodynamics is expressed as _______

(a)

$\overset{\lim}{T\rightarrow 0}{ S=0 }$

(b)

$\overset{\lim}{T\rightarrow \infty} {S=1 }$.

(c)

ΔU = q + w

(d)

G = H - TS

19. Hydrogen (a moles) and iodine (b moles) .react to give 2x moles of the HI at equilibrium. The total number of moles at equilibrium is

(a)

a+b+2x

(b)

(a-b)+(6-2x)

(c)

(a+b)

(d)

a+b-x

20. Two moles of N2 and two moles of H2 are taken in a closed vessel of 5 litre capacity and suitable conditions are provided for the reaction. When the equilibrium is reached, it is found that a half mole of N2 is used up. The equilibrium concentration of NH3 is

(a)

0.2

(b)

0.4

(c)

0.3.

(d)

0.1

21. If Kl is the equilibrium constant at temperature T1 and ~ is the equilibrium constant at temperature T2' and if'T2> T1and reaction is endothermic then

(a)

K2>K1

(b)

K2<K1

(c)

K2=K1

(d)

All of these

22. Equilibrium constant Kp for following reaction
$MgCO_{ 3\left( s \right) }\rightleftharpoons Mg{ O }_{ \left( s \right) }+{ CO }_{ 2\left( g \right) }$

(a)

Kp = Pco2

(b)

${ K }_{ p }=\cfrac { { p }_{ { CO }_{ 2 } }\times { p }_{ CO_{ 2 } }\times { p }_{ Mgo } }{ { P }_{ MrCO } }$

(c)

${ K }_{ p }=\cfrac { { P }_{ MG }{ CO }_{ 3 } }{ { P }_{ CO\bullet }p_{ mgO } }$

(d)

${ K }_{ p }=\cfrac { { P }_{ MG }{ CO }_{ 3 } }{ { P }_{ CO\bullet }p_{ mgO } }$

23. Which of the following is an example of homogeneous equilibrium?

(a)

H2O(l) ⇌ H2O(g)

(b)

CaCO3(s) ⇌ CaO(s) + CO(g)

(c)

H2(g) + I2(g) ⇌ 2HI(g)

(d)

2CO(g) ⇌ CO2(g) + C(s)

24. Consider the following equilibrium reaction and relate their equilibrium constants ________.
(i) N2 + O2 ⇌ 2NO; K1
(ii) 2NO + O2 ⇌ 2NO2; K2
(iii) N2 + 2O2 ⇌ 2NO2; K3

(a)

K3xK2=K1

(b)

K1xK3=K2

(c)

K1xK2=K3

(d)

$\frac{K_1}{K_2}=K_3$

25. Statement I. In Haber's process, NH3 is liquefied and removed.
Statement II. In manufacture of NH3, liquefied and removal of NH3, keeps the reaction moving in forward direction.

(a)

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

(b)

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

(c)

Statement I is wrong but statement II is correct.

(d)

Statement I is correct but statement II is wrong.