This document contains 19 multiple choice questions related to chemistry topics including hydrogen, water, and hydrides. It also lists the names of 5 students as "homework superstars". The questions cover topics such as properties of water, hydrogen bonding, isotopes of hydrogen, hydride formations, and water hardness. Sample answer options are also provided for each question.

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6. Ques1) During a reaction of oxalic acid, potassium
chlorate and sulphuric acid, the oxidation number
of which of the element undergoes a maximum
change
A
B
C
D
H
S
C
Cl

7. HOMEWORK
SUPERSTARS
Kamlesh Singh

8. HOMEWORK
SUPERSTARS
Bhoomi Sharma

9. HOMEWORK
SUPERSTARS
Ayush Kashyap

10. HOMEWORK
SUPERSTARS
Dakshin Kumar

11. HOMEWORK
SUPERSTARS
Parv bhavsar

13. Ques 1) Hydrogen resembles halogens in many
respects for which several factors are responsible. Of
the following factors which one is most important in
this respects ?
A
B
C
D
Its tendency to lose an electron to form a cation
Its tendency to gain a single electron in its
valence shell to attain stable
Its low negative electron gain enthalpy value
Its small size

14. Ques 1) Hydrogen resembles halogens in many
respects for which several factors are responsible. Of
the following factors which one is most important in
this respects ?
A
B
C
D
Its tendency to lose an electron to form a cation
Its tendency to gain a single electron in its
valence shell to attain stable
Its low negative electron gain enthalpy value
Its small size

15. Ques 1) Hydrogen resembles halogens in many
respects for which several factors are responsible. Of
the following factors which one is most important in
this respects ?

16. Ques 2) Element of which of the following group (s) of
periodic table do not form hydrides.
A
B
C
D
Groups 7, 8, 9
Group 13
Groups 15, 16, 17
Group 14

17. Ques 2) Element of which of the following group (s) of
periodic table do not form hydrides.
A
B
C
D
Groups 7, 8, 9
Group 13
Groups 15, 16, 17
Group 14

18. Ques 2) Element of which of the following group (s) of
periodic table do not form hydrides.

19. Ques 3) Which of the following statement is correct in
the case of heavy water ?
A
B
C
D
Heavy water is used as a moderator in nuclear
reactor.
Heavy water is more effective as solvent than
ordinary water.
Heavy water has lower boiling point than
ordinary water.
All of the above

20. Ques 3) Which of the following statement is correct in
the case of heavy water ?
A
B
C
D
Heavy water is used as a moderator in nuclear
reactor.
Heavy water is more effective as solvent than
ordinary water.
Heavy water has lower boiling point than
ordinary water.
All of the above

21. Ques 3) Which of the following statement is correct in
the case of heavy water ?

22. Ques 4) Which of the following statement is not correct
?
A
B
C
D
Elements of group-13 form electron deficient
hydrides.
Metallic hydrides conduct heart and electricity
Ionic hydrides do not conduct electricity in solid
state
Electrolysis of saline hydrides give H2 at cathode.

23. Ques 4) Which of the following statement is not correct
?
A
B
C
D
Elements of group-13 form electron deficient
hydrides.
Metallic hydrides conduct heart and electricity
Ionic hydrides do not conduct electricity in solid
state
Electrolysis of saline hydrides give H2 at cathode.

24. Ques 4) Which of the following statement is not correct
?

25. Ques 5) Match the following and identify the correct
option.
A
B
C
D
A(iii), B(i), C(ii), D(iv)
A(iii), B(ii), C(i), D(iv)
(A) CO(g) + H2(g) (i) Mg(HCO3)2 + Ca(HCO3)2
(B) Temporary hardness of water (ii) An electron deficient hydride
(C) B2H6 (iii) Synthesis gas
(D) H2O2 (iv) Non-Planar Structure
A(iii), B(iv), C(ii), D(i)
A(i), B(iii), C(ii), D(iv)

26. Ques 5) Match the following and identify the correct
option.
A
B
C
D
A(iii), B(i), C(ii), D(iv)
A(iii), B(ii), C(i), D(iv)
(A) CO(g) + H2(g) (i) Mg(HCO3)2 + Ca(HCO3)2
(B) Temporary hardness of water (ii) An electron deficient hydride
(C) B2H6 (iii) Synthesis gas
(D) H2O2 (iv) Non-Planar Structure
A(iii), B(iv), C(ii), D(i)
A(i), B(iii), C(ii), D(iv)

27. (A) CO(g) + H2(g) (i) Mg(HCO3)2 + Ca(HCO3)2
(B) Temporary hardness of water (ii) An electron deficient hydride
(C) B2H6 (iii) Synthesis gas
(D) H2O2 (iv) Non-Planar Structure

28. Ques 6) Which of the following statements about
hydrogen is incorrect?
A
B
C
D
Hydrogen has three isotopes of which tritium is
the most common
Hydrogen never acts as cation in ionic salts.
Hydronium ion, H3O+ exists freely in solution.
None of these

29. Ques 6) Which of the following statements about
hydrogen is incorrect?
A
B
C
D
Hydrogen has three isotopes of which tritium is
the most common
Hydrogen never acts as cation in ionic salts.
Hydronium ion, H3O+ exists freely in solution.
None of these

30. Ques 6) Which of the following statements about
hydrogen is incorrect?

31. Ques 7) Which one of the following pairs of substances
on reaction will not evolve H2gas ?
A
B
C
D
Copper and HCl (aqueous )
Iron and steam
Iron and H2SO4 (aqueous)
Sodium and ethyl alcohol

32. Ques 7) Which one of the following pairs of substances
on reaction will not evolve H2gas ?
A
B
C
D
Copper and HCl (aqueous )
Iron and steam
Iron and H2SO4 (aqueous)
Sodium and ethyl alcohol

33. Ques 7) Which one of the following pairs of substances
on reaction will not evolve H2gas ?

34. Ques 8) Metal hydrides are ionic, covalent or
molecular in nature. Among LiH, NaH KH, RbH, CsH, the
correct order of increasing ionic character is
A
B
C
D
LiH > NaH > CsH > KH > RbH
LiH < NaH < KH < RbH < CsH
RbH > CsH > NaH > KH > LiH
NaH > CsH > RbH > LiH > KH

35. Ques 8) Metal hydrides are ionic, covalent or
molecular in nature. Among LiH, NaH KH, RbH, CsH, the
correct order of increasing ionic character is
A
B
C
D
LiH > NaH > CsH > KH > RbH
LiH < NaH < KH < RbH < CsH
RbH > CsH > NaH > KH > LiH
NaH > CsH > RbH > LiH > KH

36. Ques 8) Metal hydrides are ionic, covalent or
molecular in nature. Among LiH, NaH KH, RbH, CsH, the
correct order of increasing ionic character is

37. Ques 9) (A) : Permanent hardness of water is removed
by treatment with washing soda
(R) : Washing soda reacts with soluble magnesium
and calcium sulphate to form insoluble carbonates .
A
B
C
D
Statements A and R both are correct and R is
the correct explanation of A
A is correct but R is not correct
A and R both are correct but R is not the correct
explanation of A
A and R both are false

38. Ques 9) (A) : Permanent hardness of water is removed
by treatment with washing soda
(R) : Washing soda reacts with soluble magnesium
and calcium sulphate to form insoluble carbonates .
A
B
C
D
Statements A and R both are correct and R is
the correct explanation of A
A is correct but R is not correct
A and R both are correct but R is not the correct
explanation of A
A and R both are false

39. Ques 9) (A) : Permanent hardness of water is removed
by treatment with washing soda
(R) : Washing soda reacts with soluble magnesium
and calcium sulphate to form insoluble carbonates .

40. Ques 10) Some of the properties of water are described
below. Which of them is not correct ?
A
B
C
D
Water is known to be a universal solvent
Hydrogen bonding is present to a large extent in
liquid water
There is no hydrogen bonding in the frozen state
of water
All of the above

41. A
B
C
D
Water is known to be a universal solvent
Hydrogen bonding is present to a large extent in
liquid water
There is no hydrogen bonding in the frozen state
of water
All of the above
Ques 10) Some of the properties of water are described
below. Which of them is not correct ?

42. Ques 10) Some of the properties of water are described
below. Which of them is not correct ?

44. Ques 11) Hydrogen is evolved by the action of cold
dilute HNO3 on :
A
B
C
D
Fe
Mg or Mn
Cu
Al

45. Ques 11) Hydrogen is evolved by the action of cold
dilute HNO3 on :
A
B
C
D
Fe
Mg or Mn
Cu
Al

46. Ques 11) Hydrogen is evolved by the action of cold
dilute HNO3 on :

47. Ques 12) Which of the following hydrides is electron -
precise hydride ?
A
B
C
D
B2H6
NH3
H2O
CH4

48. Ques 12) Which of the following hydrides is electron -
precise hydride ?
A
B
C
D
B2H6
NH3
H2O
CH4

49. Ques 12) Which of the following hydrides is electron -
precise hydride ?
A
B
C
D
B2H6
NH3
H2O
CH4

50. Ques 13) Hardness of water may be temporary or
permanent hardness is due to the presence of
A
B
C
D
Chlorides of Ca and Mg in water
Oxides of Ca and Mn in water
Carbonates of Ca and Mg in water
Carbonates of alkali metals in water

51. Ques 13) Hardness of water may be temporary or
permanent hardness is due to the presence of
A
B
C
D
Chlorides of Ca and Mg in water
Oxides of Ca and Mn in water
Carbonates of Ca and Mg in water
Carbonates of alkali metals in water

52. Ques 13) Hardness of water may be temporary or
permanent hardness is due to the presence of

53. Ques 14) During hydrate formation from aqueous
solution, water can be associated in different forms.
Indicate the wrong combination.
A
B
C
D
(i)
(ii)
(iii)
None of these
(i) Coordinated water - [Cr(H2O)6]3+ 3Cl-
(ii) Interstitial water - BaCl2.2H2O
(iii)Hydrogen bonded water - [Cu(H2O)4]2+SO4
2-.H2O

54. Ques 14) During hydrate formation from aqueous
solution, water can be associated in different forms.
Indicate the wrong combination.
A
B
C
D
(i)
(ii)
(iii)
None of these
(i) Coordinated water - [Cr(H2O)6]3+ 3Cl-
(ii) Interstitial water - BaCl2.2H2O
(iii)Hydrogen bonded water - [Cu(H2O)4]2+SO4
2-.H2O

55. Ques 14) During hydrate formation from aqueous
solution, water can be associated in different forms.
Indicate the wrong combination.
(i) Coordinated water - [Cr(H2O)6]3+ 3Cl-
(ii) Interstitial water - BaCl2.2H2O
(iii)Hydrogen bonded water - [Cu(H2O)4]2+SO4
2-.H2O

56. Ques 15) Radioactive elements emit 𝛼, ꞵ and 𝛾 rays
and are characterised by their half-lives. The
radioactive isotope of hydrogen is
A
B
C
D
Protium
Deuterium
Tritium
Hydronium

57. Ques 15) Radioactive elements emit 𝛼, ꞵ and 𝛾 rays
and are characterised by their half-lives. The
radioactive isotope of hydrogen is
A
B
C
D
Protium
Deuterium
Tritium
Hydronium

58. Ques 15) Radioactive elements emit 𝛼, ꞵ and 𝛾 rays
and are characterised by their half-lives. The
radioactive isotope of hydrogen is

59. Ques 16) Which of the statements given below are true
for the water molecule structure?
A
B
C
D
(i) and (ii)
(ii) and (iii)
(i) and (iii)
Only (ii)
(i) Oxygen undergoes sp3 hybridisation.
(ii) Due to presence of two lone pairs of electrons on
oxygen the H-O-H bonds angle is 118.40.
(iii) Due to angular geometry the net dipole moment of
water is not zero, 𝜇 = 1.84 D.

60. Ques 16) Which of the statements given below are true
for the water molecule structure?
A
B
C
D
(i) and (ii)
(ii) and (iii)
(i) and (iii)
Only (ii)
(i) Oxygen undergoes sp3 hybridisation.
(ii) Due to presence of two lone pairs of electrons on
oxygen the H-O-H bonds angle is 118.40.
(iii) Due to angular geometry the net dipole moment of
water is not zero, 𝜇 = 1.84 D.

61. Ques 16) Which of the statements given below are true
for the water molecule structure?
(i) Oxygen undergoes sp3 hybridisation.
(ii) Due to presence of two lone pairs of electrons on
oxygen the H-O-H bonds angle is 118.40.
(iii) Due to angular geometry the net dipole moment of
water is not zero, 𝜇 = 1.84 D.

62. Ques 17) The maximum number of hydrogen bonds
formed by a water molecule in ice is
A
B
C
D
4
1
2
3

63. Ques 17) The maximum number of hydrogen bonds
formed by a water molecule in ice is
A
B
C
D
4
1
2
3

64. Ques 17) The maximum number of hydrogen bonds
formed by a water molecule in ice is

65. Ques 18) Chemical A is used for water softening to
remove temporary hardness. A reacts with sodium
carbonate to generate caustic soda. When CO2 is
bubbled through A, it turns cloudy. What is A?
A
B
C
D
CaCO3
CaO
Ca(OH)2
Ca(HCO3)2

66. Ques 18) Chemical A is used for water softening to
remove temporary hardness. A reacts with sodium
carbonate to generate caustic soda. When CO2 is
bubbled through A, it turns cloudy. What is A?
A
B
C
D
CaCO3
CaO
Ca(OH)2
Ca(HCO3)2

67. Ques 18) Chemical A is used for water softening to
remove temporary hardness. A reacts with sodium
carbonate to generate caustic soda. When CO2 is
bubbled through A, it turns cloudy. What is A?

68. Ques 19) On moving from left to right in a period what
is the order of acidic character of hydrides ?
A
B
C
D
NH3 < H2O < HF
HF < H2O < NH3
H2O < HF < NH3
H2O < NH3 < HF

69. Ques 19) On moving from left to right in a period what
is the order of acidic character of hydrides ?
A
B
C
D
NH3 < H2O < HF
HF < H2O < NH3
H2O < HF < NH3
H2O < NH3 < HF

70. Ques 19) On moving from left to right in a period what
is the order of acidic character of hydrides ?
A NH3 < H2O < HF

71. Ques 20) Which of the following compounds is used
for water softening ?
A
B
C
D
Ca3 (PO4)2
Na3 PO4
Na6 P6 O18
Na2 HPO4

72. Ques 20) Which of the following compounds is used
for water softening ?
A
B
C
D
Ca3 (PO4)2
Na3 PO4
Na6 P6 O18
Na2 HPO4

73. Ques 20) Which of the following compounds is used
for water softening ?

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82. Ques ) Non - stoichiometric hydrides are produced by
A
B
C
D
Palladium , vanadium
Manganese , lithium
Nitrogen , fluorine
Carbon, nickel
Question Of
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