#### 11th All Chapter 1 mark Impatant Question

11th Standard

Reg.No. :
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Chemistry

Time : 01:00:00 Hrs
Total Marks : 60
60 x 1 = 60
1. 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

2. 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 inA 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

3. In the reaction to NH3 + H2$\longrightarrow$ ${ NH }_{ 4 }^{ + }+O\overline { H }$, 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

4. 7.5g of a gas occupy 5.6 litres of volume at STP. The gas:

(a)

NO

(b)

N2O

(c)

CO

(d)

CO2

5. 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

6. 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

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

(a)

0.529 $\mathring{A}$

(b)

0.0753$\mathring{A}$

(c)

0.7053$\mathring{A}$

(d)

0.0529$\mathring{A}$

8. 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)

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

9. 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

10. Which of the following property has no unit?

(a)

ionisation energy

(b)

electronegativity

(c)

electron affinity

(d)

11. 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

12. Which one of the following is the least electronegative element?

(a)

Bromine

(b)

Chlorine

(c)

Iodine

(d)

Hydrogen

13. Non-stoichiometric hydrides are formed by

(a)

(b)

carbon, nickel

(c)

manganese, lithium

(d)

nitrogen, chlorine

14. Water is a

(a)

basic oxide

(b)

acidic oxide

(c)

amphoteric oxide

(d)

none of these

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

(a)

Ca(OH)2

(b)

CaCO3

(c)

HCl

(d)

CaSO4

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

(a)

D2O

(b)

H2O2

(c)

NaH

(d)

B2H6

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

(a)

Na

(b)

Li

(c)

Rb

(d)

K

18. 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

19. Rock salt is major source of ________

(a)

lithium

(b)

potassium

(c)

francium

(d)

sodium

20. Which of the following salt is more soluble?

(a)

NaCIO4

(b)

LiCIO4

(c)

CsBr

(d)

Kl

21. 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

22. 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

23. 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

24. Mathematical expression of Boyle's law is ____________.

(a)

P1V1 = P2V2

(b)

$\frac{P}{V}=Constant$

(c)

$\frac{V}{T}=Constant$

(d)

$\frac{P}{T}=Constant$

25. An ideal gas expands from the volume of 1 x 10-3 m3 to 1 x 10-2 m3 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

26. ΔS is expected to be maximum for the reaction

(a)

Ca(S)+ 1/2O2(g) ⟶ CaO(S)

(b)

C(S)+ O2(g) ⟶ CO2(g)

(c)

N2(g) + O2(g) ⟶ 2NO(g)

(d)

CaCO3(S) ⟶ CaO(S) + CO2(g)

27. 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

28. Which one of the following is a state function?

(a)

Internal energy

(b)

Enthalpy

(c)

Free energy

(d)

All the above

29. 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

30. In a chemical equilibrium, the rate constant for the forward reaction is 2.5 × 102 and the equilibrium constant is 50. The rate constant for the reverse reaction is,

(a)

11.5

(b)

5

(c)

2 x 102

(d)

2 x 10-3

31. The oxidation of S02 and 02 to S03 is an exothermic reaction. The yield of S03 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

32. 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)

(b)

increasing the temperature

(c)

increasing the total pressure

(d)

increasing the volume of the container

33. 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

34. For a solution, the plot of osmotic pressure (p) 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)

310oC

(c)

37oC

(d)

${310\over 0.082}K$

35. 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

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

(a)

NaCI

(b)

KCl

(c)

(d)

all the above

37. 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-} 38. 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 39. 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 40. Which one of the following is called polar molecule? (a) H2 (b) O2 (c) F2 (d) NO 41. 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

42. 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)

${ CH }_{ 3 }-\underset { | }{ CH } -{ CH }_{ 2 }-{ CH }_{ 3 }$

43. 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

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

(a)

Chlorine

(b)

Bleaching powder

(c)

Animal charcoal

(d)

Iodine

45. For the following reactions
(A) CH3CH2CH2Br + KOH → CH2 = 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

46. The geometrical shape of carbocation is

(a)

Linear

(b)

tetrahedral

(c)

Planar

(d)

Pyramidal

47. 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

48. 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

49. Which one of the following is non aromatic?

(a)

(b)

(c)

(d)

50. 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

51. In E1,reaction, the intermediate formed is

(a)

Carbanion

(b)

Carbocation

(c)

(d)

Carbene

52. Identify A and B.

(a)

(b)

(c)

(d)

53. C -X bond is strongest in

(a)

Chloromethane

(b)

Iodomethane

(c)

Bromomethane

(d)

Fluoromethane

54. Ethylidene chloride on treatment with aqueous KOH gives

(a)

acetaldehyde

(b)

ehtyleneglycol

(c)

formaldehyde

(d)

glycoxal

55. The order of stability of the carbonium ion is__________.

(a)

1°> 2°>3°

(b)

2°> 3°>1°

(c)

2°> 1°>3°

(d)

3°>2°>1o

56. Which of the following is a secondary haloalkane?

(a)

Bromoethane

(b)

2-Chloropropane

(c)

2-Iodo-2-methylpropane

(d)

1-Chloropropane

57. 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
58. Assertion (A): Oxygen plays a key role in the troposphere
Reason (R): Troposphere is not responsible for all biological activities

(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

59. Which among the following is a green house gas?

(a)

H2

(b)

CH4

(c)

O3

(d)

All of these

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

(a)

Acrolein

(b)

Ozone

(c)

Peroxyacetyl nitrate

(d)

CFCs