11th Standard Chemistry One Mark important Questions Book back and Creative - 2020

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Questions:

Multiple Choice Question

59 x 1 = 59

Which of the following is a secondary haloalkane?

(a)

Bromoethane

(b)

2-Chloropropane

(c)

2-Iodo-2-methylpropane

(d)

1-Chloropropane

Identify A and B.

(a)

(b)

(c)

(d)

Which one of the following is correct order of stability of alkyl free radicals ?

(a)

^·C(CH₃)₃> ^·CH(CH₃)₂ > ^·CH₂CH₃ >^·CH₃

(b)

^·CH₃ > ^·CH₂CH₃ > ^·CH(CH₃)₂ > ^·C(CH₃)₃

(c)

^·CH(CH₃)₂ > ^·CH₃ > ^·CH₂CH₃ > ^·C(CH₃)₃

(d)

^·CH₂CH₃> ^·CH(CH₃)₂> ^·C(CH₃)₃> ^·CH₃

Which of the following is used to decolourise the organic compounds?

(a)

Chlorine

(b)

Bleaching powder

(c)

Animal charcoal

(d)

Iodine

Which one of the following is called polar molecule?

(a)

H₂

(b)

O₂

(c)

F₂

(d)

Which one of the following has found to have abnormal molar mass?

(a)

NaCI

(b)

KCl

(c)

Acetic add

(d)

all the above

Hydrogen molecule (H₂) can be dissociated into hydrogen atoms (H). Which one of the following changes will not increase the number of atoms present at equilibrium?

(a)

adding H atoms

(b)

increasing the temperature

(c)

increasing the total pressure

(d)

increasing the volume of the container

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

(a)

Acrolein

(b)

Ozone

(c)

Peroxyacetyl nitrate

(d)

CFCs

Which among the following is a green house gas ?

(a)

H₂

(b)

CH₄

(c)

O₃

(d)

All of these

10.

The order of stability of the carbonium ion is__________.

(a)

1°> 2°>3°

(b)

2°> 3°>1°

(c)

2°> 1°>3°

(d)

3°>2°>1^o

11.

Which one is incorrect match of reactions ?

(a)

(b)

\(C{ H }_{ 3 }-C{ H }_{ 2 }-Br\overset { aq.\quad KOH }{ \longrightarrow } C{ H }_{ 3 }-C{ H }_{ 2 }OH\) ⟶ Nucleophilic substitution reaction

(c)

(d)

\(\left( C{ H }_{ 3 } \right) C-Cl\overset { \overset { + }{ H } }{ \longrightarrow } { \left( C{ H }_{ 3 } \right) }_{ 3 }C-C{ H }_{ 2 }+{ H }_{ 2 }O+{ Cl }^{ - }\) ⟶ Nucleophilic substitution reaction

12.

The oxidation of SO₂ and O₂ to SO₃ is an exothermic reaction. The yield of SO₃ will be maximum if ____________

(a)

Temperature and pressure both are increased

(b)

Temperature decreased, pressure increased

(c)

Temperature increased, pressure constant

(d)

Temperature and pressure both decreased

13.

In E1, reaction, the intermediate formed is ___________

(a)

Carbanion

(b)

Carbocation

(c)

Carbon free radical

(d)

Carbene

14.

The sharing of valence electrons between the atoms will lead to the formation of_____

(a)

Ionic bond

(b)

Covalent bond

(c)

Co-ordinate bond

(d)

Hydrogen bond

15.

The hybridisations of central and terminal carbon atoms in are respectively.

(a)

sp and sp

(b)

sp² and sp³

(c)

sp and sp²

(d)

sp² and sp

16.

The temperature at which the vapour pressure of a liquid equals external pressure is called __________

(a)

freezing point

(b)

boiling point

(c)

melting point

(d)

critical temperature

17.

Which one of the following is the least electronegative element?

(a)

Bromine

(b)

Chlorine

(c)

Iodine

(d)

Hydrogen

18.

Match the List I with List II and select the correct answer using the code given below the lists.

List I	List II
A. Depletion of ozone layer	1. CO₂
B. Acid rain	2. NO
C. Photochemical smog	3. SO₂
D. Green house effect	4. CFC

(a)

A	B	C	D
3	4	1	2

(b)

A	B	C	D
2	1	4	3

(c)

A	B	C	D
4	3	2	1

(d)

A	B	C	D
2	4	1	3

19.

Ethylidene chloride on treatment with aqueous KOH gives ___________

(a)

acetaldehyde

(b)

ehtyleneglycol

(c)

formaldehyde

(d)

glycoxal

20.

C -X bond is strongest in __________

(a)

Chloromethane

(b)

Iodomethane

(c)

Bromomethane

(d)

Fluoromethane

21.

Peroxide effect (Kharasch effect) can be studied in case of ___________

(a)

Oct – 4 – ene

(b)

hex – 3 – ene

(c)

pent – 1 – ene

(d)

but – 2 – ene

22.

Which one of the following is non aromatic?

(a)

(b)

(c)

(d)

23.

The geometrical shape of carbocation is ______________.

(a)

Linear

(b)

tetrahedral

(c)

Planar

(d)

Pyramidal

24.

For the following reactions
(A) CH₃CH₂CH₂Br + KOH → CH₃ - CH = CH₂ +KBr + H₂O
(B) (CH₃)₃CBr + KOH → (CH₃)₃ COH + KBr
(C)
Which of the following statement is correct ?

(a)

(A) is elimination, (B) and (C) are substitution

(b)

(A) is substitution, (B) and (C) are elimination

(c)

(A) and (B) are elimination and (C) is addition reaction

(d)

(A) is elimination, B is substitution and (C) is addition reaction

25.

The structure of isobutyl group in an organic compound is_______________________

(a)

CH₃ - CH₂ - CH₂ - CH₂ -

(b)

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

(c)

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

(d)

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

26.

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

27.

Bond order of a species is 2.5 and the number of electons in its bonding molecular orbital is formd to be 8 The no. of electons in its antibonding molecular orbital __________

(a)

three

(b)

four

(c)

Zero

(d)

cannot be calculated form the given unformation

28.

Which of these represents the correct order of their increasing bond order _________

(a)

C₂ < C₂ ^2- < O₂ ^2-< O₂

(b)

C₂ ^2- < C₂ ⁺ < O₂< O₂ ^2-

(c)

O₂ ^2- < O₂< C₂ ^2- < C ²⁺

(d)

O₂ ^2- < C₂ ⁺< O₂< C₂ ^2-

29.

For a solution, the plot of osmotic pressure (\(\pi\)) verses the concentration (c in mol L^–1) gives a straight line with slope 310R where 'R' is the gas constant. The temperature at which osmotic pressure measured is ____________

(a)

310 x 0.082 K

(b)

310^oC

(c)

37^oC

(d)

\({310\over 0.082}K\)

30.

The mass of a non-voltaile solute (molar mass 80 g mol^–1) which should be dissolved in 92g of toluene to reduce its vapour pressure to 90% ______________

(a)

10g

(b)

20g

(c)

9.2g

(d)

8.89g

31.

In a chemical equilibrium, the rate constant for the forward reaction is 2.5 \(\times\)10² and the equilibrium constant is 50. The rate constant for the reverse reaction is ____________

(a)

11.5

(b)

(c)

2 x 10²

(d)

2 x 10^-3

32.

If x is the fraction of PCl₅ dissociated at equilibrium in the reaction
PCl₅ ⇌ PCl₃ + Cl₂
then starting with 0.5 mole of PCl₅, the total number of moles of reactants and products at equilibrium is ___________

(a)

0.5 - x

(b)

x + 0.5

(c)

2x + 0.5

(d)

x + 1

33.

Which one of the following is a state function?

(a)

Internal energy

(b)

Enthalpy

(c)

Free energy

(d)

All the above

34.

Mathematical expression of Boyle's law is ____________.

(a)

P₁V₁ = P₂V₂

(b)

\(\frac{P}{V}=Constant\)

(c)

\(\frac{V}{T}=Constant\)

(d)

\(\frac{P}{T}=Constant\)

35.

Which of the following salt is more soluble?

(a)

NaCIO₄

(b)

LiCIO₄

(c)

CsBr

(d)

36.

Rock salt is major source of ________

(a)

lithium

(b)

potassium

(c)

francium

(d)

sodium

37.

Which one of the following is the time independent Schrodinger wave equation?

(a)

\(\triangle x.\triangle p\ge {h\over 4\pi}\)

(b)

\({\partial^2\psi\over \partial x^2}+{\partial^2\psi\over \partial y^2}+{\partial^2\psi\over \partial z^2}+{8\pi^2m\over h^2}=0\)

(c)

\({\partial^2\psi\over \partial x^2}+{\partial^2\psi\over \partial y^2}+{\partial^2\psi\over \partial z^2}+{8\pi^2m\over h^2}(E-V)\psi=0\)

(d)

\(\hat{H}\psi-E\psi=-{8\pi^2m\over h^2}\)

38.

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

(a)

D₂O

(b)

H₂O₂

(c)

NaH

(d)

B₂H₆

39.

The Bohr's radius of Li²⁺ of 2^nd orbit is ________________

(a)

0.529 \(\mathring{A}\)

(b)

0.0753\(\mathring{A}\)

(c)

0.7053\(\mathring{A}\)

(d)

0.0529\(\mathring{A}\)

40.

7.5g of a gas occupy 5.6 litres of volume at STP. The gas ____________

(a)

(b)

N₂O

(c)

(d)

CO₂

41.

Heat of neutralization of a strong acid by a strong base is a constant value because:

(a)

only H⁺ and OH^- ions react in every case

(b)

the strong base and strong acid react completely

(c)

the strong base and strong acid react in aqueous solution

(d)

salt formed does not hydrolyse

42.

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

43.

Equal volumes of He, O₂ and SO₂ are taken in a closed container. The ratio of the partial pressures of gases He, O₂ and SO₂ would be __________

(a)

1 : 2 : 8

(b)

8 : 16 : 1

(c)

1 : 4 : 16

(d)

16 : 2 :1

44.

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

45.

Which of the following property has no unit?

(a)

ionisation energy

(b)

electronegativity

(c)

electron affinity

(d)

atomic radius

46.

In the reaction to NH₃ + H₂O \(\longrightarrow \) \({ NH }_{ 4 }^{ + }+O\overline { H } \), NH₃ is acidic in. the reason for its acidic is_____

(a)

Acceptance of one ^H+from water

(b)

A release of one OH^-ion

(c)

Due to the nitrogen atom

(d)

All the above

47.

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

(a)

Ca(OH)₂

(b)

CaCO₃

(c)

HCl

(d)

CaSO₄

48.

ΔS is expected to be maximum for the reaction ____________

(a)

Ca_(S)+ 1/2O_2(g)⟶ CaO_(S)

(b)

C_(S)+O_2(g) ⟶ CO_2(g)

(c)

N_2(g)+ O_2(g)⟶ 2NO_(g)

(d)

CaCO_3(S)⟶ CaO_(S)+ CO_2(g)

49.

An ideal gas expands from the volume of 1 x 10^-3 m³to 1 x 10^-2m³ at 300 K against a constant pressure at 1 x 10⁵ Nm^-2. The work done is ______________

(a)

- 900 J

(b)

900 kJ

(c)

270 kJ

(d)

-900 kJ

50.

When CaC₂ is heated in atmospheric nitrogen in an electric furnace the compound formed is ___________

(a)

Ca(CN)₂

(b)

CaNCN

(c)

CaC₂N₂

(d)

CaNC₂

51.

The energy of an electron in the 3rd orbit of hydrogen atom is -E. The energy of an electron in the first orbit will be ___________

(a)

-3E

(b)

\(\frac{-E}{3}\)

(c)

\(\frac{-E}{9}\)

(d)

-9E

52.

Which of the following has the highest tendency to give the reaction \(M_{g}^{+}\xrightarrow[Medium]{Aqueous}M_{aq}^{+}\)

(a)

(b)

(c)

(d)

53.

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)

(b)

(c)

(d)

54.

Two 22.4 litre containers A and B contains 8 g of O₂ and 8 g of SO₂ respectively at 273 K and 1 atm pressure, then ______.

(a)

Number of molecules in A and B are same

(b)

Number of molecules in B is more than that in A.

(c)

The ratio between the number of molecules in A= to number of molecules in B is 2:1

(d)

Number of molecules in B is three times greater than the number of molecules in A

55.

Gases deviate from ideal behavior at high pressure. Which of the following statement(s) is correct for non-ideality?

(a)

at high pressure the collision between the gas molecule become enormous

(b)

at high pressure the gas molecules move only in one direction

(c)

at high pressure, the volume of gas become insignificant

(d)

at high pressure the intermolecular interactions become significant

56.

Water is a ___________

(a)

basic oxide

(b)

acidic oxide

(c)

amphoteric oxide

(d)

none of these

57.

Non-stoichiometric hydrides are formed by _____________

(a)

palladium, vanadium

(b)

carbon, nickel

(c)

manganese, lithium

(d)

nitrogen, chlorine

58.

The group of elements in which the differentiating electron enters the anti penultimate shell of atoms are called ___________

(a)

p-block elements

(b)

d-block elements

(c)

s-block elements

(d)

f-block elements

59.

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant ?

(a)

Carbon

(b)

Oxygen

(c)

Both carbon and oxygen

(d)

Neither carbon nor oxygen

Assertion and reason

1 x 2 = 2

60.

Assertion (A) : Oxygen plays a key role in the troposphere
Reason (R) : Troposphere is not responsible for all biological activities
i) Both (A) and R are correct and (R) is the correct explanation of (A)
ii) Both (A) and R are correct and (R) is not the correct explanation of (A)
iii) Both (A) and R are not correct
iv) (A) is correct but( R) is not correct

(a)

Both (A) and R are correct and (R) is the correct explanation of (A)

(b)

Both (A) and R are correct and (R) is not the correct explanation of (A)

(c)

Both (A) and R are not correct

(d)

(A) is correct but( R) is not correct

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Answers Key:

Multiple Choice Question

59 x 1 = 59

(b)
2-Chloropropane

(a)
^·C(CH₃)₃> ^·CH(CH₃)₂ > ^·CH₂CH₃ >^·CH₃

(d)
NO

(d)
all the above

(d)
CFCs

(b)
CH₄

10.

(d)
3°>2°>1^o

11.

(d)
\(\left( C{ H }_{ 3 } \right) C-Cl\overset { \overset { + }{ H } }{ \longrightarrow } { \left( C{ H }_{ 3 } \right) }_{ 3 }C-C{ H }_{ 2 }+{ H }_{ 2 }O+{ Cl }^{ - }\) ⟶ Nucleophilic substitution reaction

12.