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Questions:

Multiple Choice Question

50 x 1 = 50

______ shaped polynuclear hydrocarbon are much more toxic & carcinogenic.

(a)

(b)

(c)

(d)

Benzene is in involved in _______ reaction.

(a)

Nucleophilic substitution

(b)

electrophilic substitution

(c)

Elimination

(d)

None

According to Huckel's rule presence of _______ electrons in the ring, which is explained by Aromaticity.

(a)

(4n+2)

(b)

(4n+3)\(\sigma\)

(c)

(4n+2)\(\pi\)

(d)

(2n+1)\(\pi\)

In alkynes the % of s - Character in sp hybrid orbital is ____.

(a)

50%

(b)

55%

(c)

33%

(d)

25%

Polystyrene is used in _____.

(a)

foam cups

(b)

toys

(c)

flexible items

(d)

yars

Propylene is treated with ozone to give _____.

(a)

HCHO + CH₃CHO

(b)

HCHO + CH₃COOH

(c)

CH₃COCH₃

(d)

CH₃COCH₃ + CH₃COOH

The colour of Br₂ / H₂O is _____.

(a)

orange

(b)

green

(c)

reddish yellow

(d)

reddish brown

C₆ - C₁₂ are used as _____.

(a)

lubricants

(b)

petrollium jelly

(c)

diesel fuels

(d)

gasoline

The type of substitution reaction that takes place when methane, is treated with Cl₂ in presence of light is _____.

(a)

ionic

(b)

electrophilic

(c)

nucleophilic

(d)

radical

10.

\(\mathrm{CH}_{3} \mathrm{CH}=\mathrm{CH}_{2}+\mathrm{H}_{2} \stackrel{\mathrm{Pt}}{\longrightarrow} ?\)

(a)

CH₃ - CH₂ - CH₂ - CH₃

(b)

CH₃ CH₂ CH₃

(c)

CH₃ CH = CH₂

(d)

\({ CH }_{ 3 }-\underset { \overset { | }{ { CH }_{ 3 } } }{ C } H-{ CH }_{ 2 }\)

11.

\(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{~N}_{2} \mathrm{Cl}+\stackrel{\mathrm{Warm}}{\longrightarrow} ?\)

(a)

C₆H₅I

(b)

C₆H₅Kl

(c)

C₆H₆

(d)

C₆H₅OH

12.

'DO' value of a water sample is 6 ppm. Calculate the weight of dissolved oxygen present in 100 kg of water sample?

(a)

0.9 g

(b)

0.6 g

(c)

0.1 g

(d)

0.5 g

13.

Beryllium is _________ in nature.

(a)

paramagnetic

(b)

diamagnetic

(c)

ferromagnetic

(d)

none

14.

Which one of the following react with gringnard reagent followed by hydrolysis will yield primary alcohol?

(a)

CH₃CHO

(b)

HCHO

(c)

CH₃COCH₃

(d)

CO₂

15.

Fine the odd one out:

(a)

Benzene

(b)

Ethane

(c)

Ethene

(d)

Propyne

16.

Consider the following statements.
(i) The process of reduction using sodium in liquid ammonia is called as Birch reduction.
(ii) Birch reduction is stereospecific in reaction.
(iii) Alkynes can be reduced to cis - alkenes using Birch reduction. Which of the above statement is/are correct?

(a)

(i) and (ii)

(b)

(ii) and (iii)

(c)

(iii) only

(d)

(ii) only

17.

Identify the component of photechemical smog which is not the common one.

(a)

Acrolein

(b)

Ozone

(c)

Peroxyacetyl nitrate

(d)

CFCs

18.

2-butene shows geometrical isomerism due to ________

(a)

Restricted rotation about double bond

(b)

Free rotation about double bond

(c)

Free rotation about single bond

(d)

Chiral carbon

19.

How many structural isomers are possible for the molecular formula C₄H₈ which can undergo ozonolysis?

(a)

(b)

(c)

(d)

20.

Which of the following is secondary alkyl halide?

(a)

Iso butyl chloride

(b)

Isopentyl chloride

(c)

Neopentyl chloride

(d)

Isopropyl chloride

21.

The best reagent for converting an alcohol into the corresponding chloride is

(a)

PCl₃

(b)

PCl₅

(c)

SOCl₂

(d)

HCl/ZnCl₂

22.

Which one of the following arrangements represent the correct order of least negative to most negative electron gain enthalpy _______________.

(a)

Al < O < C < Ca < F

(b)

Al < Ca < O < C < F

(c)

C < F < O < Al < Ca

(d)

Ca < Al < C < O < F

23.

IUPAC name of \({ CH }_{ 3 }-\overset { \underset { | }{ H } }{ \underset { \overset { | }{ { C }_{ 2 }{ H }_{ 5 } } }{ C } } -\overset { \underset { | }{ { C }_{ 4 }{ H }_{ 9 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -{ CH }_{ 3 }\) is ________

(a)

3, 4, 4 – Trimethylheptane

(b)

2 – Ethyl –3, 3– dimethyl heptane

(c)

3, 4, 4 – Trimethyloctane

(d)

2 – Butyl -2 –methyl – 3 – ethyl-butane

24.

Which one of the following is diamagnetic ?

(a)

O₂

(b)

\(O_2^{2-}\)

(c)

\(O_2^+\)

(d)

None of these

25.

The correct equation for the degree of an associating solute, 'n' molecules of which undergoes association in solution, is _____________

(a)

\(\alpha=\frac{n(i-1)}{n-1}\)

(b)

\(\alpha^2=\frac{n(1-i)}{(n-1)}\)

(c)

\(\alpha=\frac{n(i-1)}{1-\mathrm{n}}\)

(d)

\(\alpha=\frac{n(1-i)}{n(1-i)}\)

26.

Osometic pressure (p) of a solution is given by the relation ____________

(a)

= nRT

(b)

V = nRT

(c)

\(\pi\)RT = n

(d)

none of these

27.

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)

\(K_2{K_3\over K_1}\)

28.

In the equilibrium,
2A(g) ⇌ 2B(g) + C₂(g)
the equilibrium concentrations of A, B and C₂ at 400 K are 1\(\times\)10^–4 M, 2.0 \(\times\)10^–3 M, 1.5 \(\times\)10^–4 M respectively. The value of K_C for the equilibrium at 400 K is ________

(a)

0.06

(b)

0.09

(c)

0.62

(d)

3 x 10^-2

29.

At a given temperature and pressure, the equilibrium constant values for the equilibria
\({ 3A }_{ 2 }+{ B }_{ 2 }+2C\overset { { K }_{ 1 } }{ \rightleftharpoons } { 2A }_{ 3 }BC\) and
\({ A }_{ 3 }BC\overset { { K }_{ 2 } }{ \rightleftharpoons } 3/2\left[ { A }_{ 2 } \right] +\frac { 1 }{ 2 } { B }_{ 2 }+C\)
The relation between K₁ and K₂ is ___________

(a)

\(K_1={1\over \sqrt{K_2}}\)

(b)

\(K_2=K_1^{-1/2}\)

(c)

\(K_1^2=2K_2\)

(d)

\({K_1\over 2}=K_2\)

30.

The rate of diffusion of a gas is ____________.

(a)

directly proportional to its density

(b)

directly proportional to its molecular mass

(c)

directly proportional to its square root of its molecular mass

(d)

inversely proportional to its square root of its molecular mass

31.

The compressibility factor for an ideal gas is ______________.

(a)

1.5

(b)

(c)

(d)

\(\propto \)

32.

Considering the elements F, CI, O and N, the correct order of their chemical reactivity in terms of oxidizing property is_____

(a)

F > CI > O > N

(b)

F > O > CI > N

(c)

CI > F > O > N

(d)

0 > F > N > CI

33.

The size of isoelectronic species- F^-, Ne and Na⁺ is affected by _____________

(a)

nuclear charge (Z)

(b)

valence principal quantum number (n)

(c)

electron-electron interaction in the outer orbitals

(d)

none of the factors becausetheir size is the same

34.

Which one of the following is used to build the beam pipe in accelerators?

(a)

(b)

(c)

(d)

35.

Assertion: Number of radial and angular nodes for 3p orbital are 1, 1 respectively.
Reason: Number of radial and angular nodes depends only on principal quantum number.

(a)

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

(b)

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

(c)

assertion is true but reason is false

(d)

both assertion and reason are false

36.

The bond dissociation energy of methane and ethane are 360 kJ mol^-1 and 620 kJ mol^-1 respectively. Then, the bond dissociation energy of C-C bond is ______________.

(a)

170 kJ mol^-1

(b)

50 kJ mol^-1

(c)

80 kJ mol^-1

(d)

220 kJ mol^-1

37.

In an adiabatic process, which of the following is true ?

(a)

q = w

(b)

q = 0

(c)

ΔE = q

(d)

PΔV= 0

38.

Which is the correct sequence of solubility of carbonates of alkaline earth metals ?

(a)

BaCO₃ > SrCO₃ > CaCO₃ > MgCO₃

(b)

MgCO₃ > CaCO₃ > SrCO₃ > BaCO₃

(c)

CaCO₃ > BaCO₃ > SrCO₃ > BaCO₃

(d)

BaCO₃ > CaCO₃ > SrCO₃ > MgCO₃

39.

Which of the following compounds will not evolve H₂ gas on reaction with alkali metals ?

(a)

ethanoic acid

(b)

ethanol

(c)

phenol

(d)

none of these

40.

The table indicates the value of van der Waals constant 'a' in (dm³)² atm. mol^-2.

Gas	O₂	N₂	NH₃	CH₄
a	1.360	1.390	4.170	2.253

The gas which can be most easily liquefied is ______________

(a)

O₂

(b)

N₂

(c)

NH₃

(d)

CH₄

41.

Electron density in the yz plane of 3d_xy orbital is ___________

(a)

zero

(b)

0.50

(c)

0.75

(d)

0.90

42.

Which of the following is the correct expression for the equation of state of van der Waals gas?

(a)

\(\left( P+\frac { a }{ { n }^{ 2 }{ V }^{ 2 } } \right) (V-nb)=nRT\)

(b)

\(\left( P+\frac { na }{ { n }^{ 2 }{ V }^{ 2 } } \right) (V-nb)=nRT\)

(c)

\(\left( P+\frac { { an }^{ 2 } }{ { V }^{ 2 } } \right) (V-nb)=nRT\)

(d)

\(\left( \frac { P+{ n }^{ 2 }{ a }^{ 2 } }{ { V }^{ 2 } } \right) (V-ab)=nRT\)

43.

Total number of electrons present in 1.7 g of ammonia is _____.

(a)

6.022\(\times\)10²³

(b)

\(\frac { 6.022\times { 10 }^{ 22 } }{ 1.7 } \quad \)

(c)

\(\frac { 6.022\times { 10 }^{ 24 } }{ 1.7 } \)

(d)

\(\frac { 6.022\times { 10 }^{ 23 } }{ 1.7 } \)

44.

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

45.

Zeolite used to soften hardness of water is hydrated _____________

(a)

Sodium aluminium silicate

(b)

Calcium aluminium silicate

(c)

Zinc aluminium borate

(d)

Lithium aluminium hydride

46.

Which of the following statements about hydrogen is incorrect?

(a)

Hydrogen ion, H₃O⁺ exists freely in solution.

(b)

Dihydrogen acts as a reducing agent.

(c)

Hydrogen has three isotopes of which tritium is the most common.

(d)

Hydrogen never acts as cation in ionic salts.

47.

The electronic configuration of the elements A and B are 1s², 2s ²,2p⁶,3s² and 1s², 2s²,2p⁵ respectively. The formula of the ionic compound that can be formed between these elements is ___________

(a)

(b)

AB₂

(c)

A₂B

(d)

none of the above

48.

1 g of an impure sample of magnesium carbonate (containing no thermally decomposable impurities) on complete thermal decomposition gave 0.44 g of carbon dioxide gas. The percentage of impurity in the sample is ______________.

(a)

(b)

4.4%

(c)

16%

(d)

8.4%

49.

40 ml of methane is completely burnt using 80 ml of oxygen at room temperature The volume of gas left after cooling to room temperature is _______.

(a)

40 ml CO₂ gas

(b)

40 ml CO₂ gas and 80 ml H₂O gas

(c)

60 ml CO₂ gas and 60 ml H₂O gas

(d)

120 ml CO₂ gas

50.

The energy of light of wavelength 45 nm is _____________.

(a)

6.67 x 10¹⁵J

(b)

6.67 x 10¹¹J

(c)

4.42 x 10^-18J

(d)

4.42 x 10^-15J

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Answers Key:

Multiple Choice Question

50 x 1 = 50

(d)
L

(b)
electrophilic substitution

(a)
50%

(a)
foam cups

(a)
HCHO + CH₃CHO

(d)
reddish brown

(d)
gasoline

(d)
radical

10.

(b)
CH₃ CH₂ CH₃

11.

(a)
C₆H₅I

12.

(b)
0.6 g

13.

(b)
diamagnetic

14.

(b)
HCHO

15.

(a)
Benzene

16.

(a)
(i) and (ii)

17.

(d)
CFCs

18.

(a)
Restricted rotation about double bond

19.

20.

(d)
Isopropyl chloride

21.

22.

(d)
Ca < Al < C < O < F

23.

24.

(b)
\(O_2^{2-}\)

25.

26.

(b)
V = nRT

27.

28.

(a)
0.06

29.

(b)
\(K_2=K_1^{-1/2}\)

30.

(d)
inversely proportional to its square root of its molecular mass

31.

32.

(b)
F > O > CI > N

33.

(a)
nuclear charge (Z)

34.

(a)
Be

35.

36.

37.

(b)
q = 0

38.

(b)
MgCO₃ > CaCO₃ > SrCO₃ > BaCO₃

39.

(d)
none of these

40.

41.

(a)
zero

42.

43.

(a)
6.022\(\times\)10²³

44.

(b)
spin quantum number

45.

(a)
Sodium aluminium silicate

46.

47.

(b)
AB₂

48.

49.

(a)
40 ml CO₂ gas

50.

11th Standard Chemistry English Medium - Important 1 Mark MCQ's Question Paper and Answer Key 2022 - 2023

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