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

11th Standard

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Chemistry

Time : 00:20:00 Hrs
Total Marks : 20

25 x 1 = 25
1. Assertion: Two mole of glucose contains 12.044 x 1023 molecules of glucose
Reason: Total number of entities present in one mole of any substance is equal to 6.02 x 1022

(a)

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

(b)

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

(c)

an assertion is true but reason is false

(d)

both assertion and reason are false

2. The oxidation number of oxygen in O2 is _______________

(a)

0

(b)

+1

(c)

+2

(d)

-2

3. Identify the correct statements with reference to the given reaction
P4 + 3OH- + 3H2O $\longrightarrow$ PH3 + 3H2PO2-
(i) Phosphorous is undergoing reduction only
(ii) Phosphorous is undergoing oxidation only
(iii) Phosphorous is undergoing both oxidation and reduction.
(iv) Hydrogen is undergoing neither oxidation nor reduction.

(a)

only (iii)

(b)

both (iii) and (iv)

(c)

only (i)

(d)

None of these

4. Consider the following statements
i) Matter possesses mass.
ii) 22-carat gold is a mixture.
iii) Dry ice is a compound.
Which of the following statement(s) given above is/ are correct?

(a)

1 & 3

(b)

Only 1

(c)

1 & 2

(d)

1,2, & 3

5. The characteristic feature of orderly arrangement of molecules belongs to

(a)

Solids

(b)

Liquid

(c)

Gases

(d)

None of these

6. Atomicity of nitrogen is

(a)

1

(b)

2

(c)

3

(d)

Zero

7. Assertion: The ash produced by burning paper in air is lighter than the original mass of paper.
Reason: he residue left after combustion of a chemical entity is always lighter

(a)

Both assertion and reason are correct and reason is the correct explanation for assertion.

(b)

Both assertion and reason are correct but reason is not the correct explanation for assertion

(c)

Assertion is true but reason are false

(d)

Both assertion and reason are false

8. The oxidation number of carbon in CH3 - CH2OH is _______________.

(a)

+2

(b)

-2

(c)

0

(d)

+4

9. The maximum number of electrons in a sub shell is given by the expression

(a)

2n2

(b)

21+ I

(c)

41+ 2

(d)

none of these

10. If the energy of an electron in the second Bohr orbit of H-atom is -E, what is the energy of the electron in the Bohr's first orbit?

(a)

2E

(b)

-4E

(c)

-2E

(d)

4E

11. Which of the following set of quantum number is possible?

(a)

n=4 l=2 m=-2 s=-2

(b)

n = 4 l=4 m = 0 s=1/2

(c)

n=4 l=3 m= -3 s= 1/2

(d)

n=4 l=0 m=0 s=0

12. Assertion (A): The orbitals having equal energy are known as degenerate orbitals.
Reason (R): The three 2p orbitals are degenerate is the presence of external magnetic field.

(a)

Both A and R are true and R is the correct explanation of A

(b)

Both A and R are true but R is not the correct explanation of A

(c)

A is true but R is false

(d)

Both A and R are false

13. Which of the following statement (s) about the Modern Periodic Table is are incorrect
i. The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number.
ii. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.
iii. Isotopes are placed in adjoining group (s) in the Periodic Table.
iv. The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number.

(a)

(i) only

(b)

(i), (ii) and (iii)

(c)

(i), (ii) and (iv)

(d)

(iv) only

14. Law of triad was unable to explain for the element

(a)

Ca, Sr and Ba

(b)

Fe, Co, Ni

(c)

Li, Na, K

(d)

CI, Br, I

15. Which of the following factor decreases across the period?

(a)

Ionisation energy

(b)

electron affinity

(c)

(d)

electronegativity

16. Which of the following statement is incorrect?

(a)

The ionization potential of nitrogen is greater than that of oxygen

(b)

The electron affinity of F is greater than that of Cl.

(c)

The ionization potential of Mg is greater than aluminium.

(d)

The electronegativity of F is greater than that of Cl.

17. Consider the following statements.
(i) d-block elements show variable oxidate states.
(ii) Mostly d-block elements form colourless compounds.
(iii) Mostly d-block elements are diamagnetic due to paired electrons.
Which of the above statement is/are not correct?

(a)

(i) only

(b)

(ii) only

(c)

(i) and (ii)

(d)

(ii) and (iii)

18. Which of the following metal is not in liquid state?

(a)

Gallium

(b)

Aluminium

(c)

Mercury

(d)

Caesium

19. Which of the following possess almost same properties due to lanthanide contraction?

(a)

Zr,HF

(b)

Na,K

(c)

Zn,Cd

(d)

Ag,Au

20. The chemical that is added to water in order to remove temporary hardness is ____________

(a)

Ca(OH)2

(b)

CaCO3

(c)

HCl

(d)

CaSO4

21. The variation of volume V, with temperature T, keeping pressure constant is called the coefficient of thermal expansion ie $\alpha =\frac { 1 }{ V } { \left( \frac { \partial V }{ \partial T } \right) }_{ P }$ . For an ideal gas a is equal to

(a)

T

(b)

1/T

(c)

P

(d)

none of these

22. The equilibrium constants of the following reactions are:

 N2 + 3H2 ⇌ 2NH3   : K1 N2 + O2 ⇌ 2NO      : K2 H2 + ½O2 ⇌ H2O   : K3

The equilibrium constant (K) for the reaction ;
${ 2NH }_{ 3 }+5/2{ O }_{ 2 }\overset { K }{ \rightleftharpoons } 2NO+{ 3H }_{ 2 }{ O },$ will be

(a)

$K_2^3{K_3\over K_1}$

(b)

$K_1{K_3^3\over K_2}$

(c)

$K_2{K_3^3\over K_1}$

(d)

$K_2{K_3\over K_1}$

23. The IUPAC name of  is

(a)

2 – Bromo -3 – methyl butanoic acid

(b)

2 - methyl - 3- bromobutanoic acid

(c)

3 - Bromo - 2 - methylbutanoic acid

(d)

3 - Bromo - 2, 3 - dimethyl propanoic acid

24. What is the hybridisation state of benzyl carbonium ion?

(a)

sp2

(b)

spd2

(c)

sp3

(d)

sp2d

25. Which of the following is aliphatic saturated hydrocarbon

(a)

C8 H18

(b)

C9 H18

(c)

C8 H14

(d)

All of these