Hydrogen Practice Questions - DPP for JEE

 Page 1


PART-I (Single Correct MCQs)
1. Which statement is correct for hydrogen ?
(a) It has a very high ionisation potential
(b) It is always collected at cathode
(c) It can exist both in +1 as well as –1 oxidation state
(d) It has same electronegativity as halogens
2. The adsorption of hydrogen by metals is called
(a) Dehydrogenation
(b) Hydrogenation
(c) Occlusion
(d) Adsorption
3. Which of the following terms is not correct for hydrogen ?
(a) Its molecule is diatomic
Page 2


PART-I (Single Correct MCQs)
1. Which statement is correct for hydrogen ?
(a) It has a very high ionisation potential
(b) It is always collected at cathode
(c) It can exist both in +1 as well as –1 oxidation state
(d) It has same electronegativity as halogens
2. The adsorption of hydrogen by metals is called
(a) Dehydrogenation
(b) Hydrogenation
(c) Occlusion
(d) Adsorption
3. Which of the following terms is not correct for hydrogen ?
(a) Its molecule is diatomic
(b) It exists both as H
+
 and H
–
 in different chemical compounds
(c) It is the only species which has no neutrons in the nucleus
(d) Heavy water is unstable because hydrogen is substituted by its isotope
deuterium
4. Hydrogen can be fused to form helium at
(a) High temperature and high pressure
(b) High temperature and low pressure
(c) Low temperature and high pressure
(d) Low temperature and low pressure
5. The hydride ion, H
–
, is a stronger base than the hydroxide ion, OH
–
.
Which one of the following reactions will occur if sodium hydride
(NaH) is dissolved in water?
(a)
(b)
(c)
(d)
6. Which of the following reactions is an example of use of water gas in
the synthesis of other compounds?
(a)
(b)
(c)
(d)
7. Elements of which of the following group(s) of periodic table do not
form hydrides?
(a) Groups 7, 8, 9
Page 3


PART-I (Single Correct MCQs)
1. Which statement is correct for hydrogen ?
(a) It has a very high ionisation potential
(b) It is always collected at cathode
(c) It can exist both in +1 as well as –1 oxidation state
(d) It has same electronegativity as halogens
2. The adsorption of hydrogen by metals is called
(a) Dehydrogenation
(b) Hydrogenation
(c) Occlusion
(d) Adsorption
3. Which of the following terms is not correct for hydrogen ?
(a) Its molecule is diatomic
(b) It exists both as H
+
 and H
–
 in different chemical compounds
(c) It is the only species which has no neutrons in the nucleus
(d) Heavy water is unstable because hydrogen is substituted by its isotope
deuterium
4. Hydrogen can be fused to form helium at
(a) High temperature and high pressure
(b) High temperature and low pressure
(c) Low temperature and high pressure
(d) Low temperature and low pressure
5. The hydride ion, H
–
, is a stronger base than the hydroxide ion, OH
–
.
Which one of the following reactions will occur if sodium hydride
(NaH) is dissolved in water?
(a)
(b)
(c)
(d)
6. Which of the following reactions is an example of use of water gas in
the synthesis of other compounds?
(a)
(b)
(c)
(d)
7. Elements of which of the following group(s) of periodic table do not
form hydrides?
(a) Groups 7, 8, 9
(b) Group 13
(c) Groups 15, 16, 17
(d) Group 14
8. Which one of the following pairs of substances will not produce
hydrogen when reacted together?
(a) Copper and conc. nitric acid
(b) Ethanol and metallic sodium
(c) Magnesium and steam
(d) Phenol and metallic sodium
9. Which of the following is not a use of dihydrogen ?
(a) It used in fuel cells for generating electrical energy.
(b) Atomic hydrogen and oxy-hydrogen torches are used for cutting and
welding purposes.
(c) It used in the synthesis of hydroquinone and tartaric acid.
(d) Both (b) and (c)
10. At its melting point ice is lighter than water because
(a) H
2
O molecules are more closely packed in solid state
(b) ice crystals have hollow hexagonal arrangement of H
2
O molecules.
(c) on melting of ice the H
2
O molecule shrinks in size
(d) ice froms mostly heavy water on first melting.
11. Identify x and y in following reaction:
 y + 2H
+
(aq) + H
2
O
2
(aq)
(a) x = H
2
SO
4 
(aq), y =
(b) x = HO
3
SOOSO
3
H(aq), y =
(c) x = HO
3
SOOSO
3
H (aq), y = H
2
SO
4
(aq)
(d) x = H
2
SO
4
(aq) ,  y = HO
3
SOOSO
3
H(aq)
12. Which of the following statements in relation to the hydrogen atom is
correct ?
Page 4


PART-I (Single Correct MCQs)
1. Which statement is correct for hydrogen ?
(a) It has a very high ionisation potential
(b) It is always collected at cathode
(c) It can exist both in +1 as well as –1 oxidation state
(d) It has same electronegativity as halogens
2. The adsorption of hydrogen by metals is called
(a) Dehydrogenation
(b) Hydrogenation
(c) Occlusion
(d) Adsorption
3. Which of the following terms is not correct for hydrogen ?
(a) Its molecule is diatomic
(b) It exists both as H
+
 and H
–
 in different chemical compounds
(c) It is the only species which has no neutrons in the nucleus
(d) Heavy water is unstable because hydrogen is substituted by its isotope
deuterium
4. Hydrogen can be fused to form helium at
(a) High temperature and high pressure
(b) High temperature and low pressure
(c) Low temperature and high pressure
(d) Low temperature and low pressure
5. The hydride ion, H
–
, is a stronger base than the hydroxide ion, OH
–
.
Which one of the following reactions will occur if sodium hydride
(NaH) is dissolved in water?
(a)
(b)
(c)
(d)
6. Which of the following reactions is an example of use of water gas in
the synthesis of other compounds?
(a)
(b)
(c)
(d)
7. Elements of which of the following group(s) of periodic table do not
form hydrides?
(a) Groups 7, 8, 9
(b) Group 13
(c) Groups 15, 16, 17
(d) Group 14
8. Which one of the following pairs of substances will not produce
hydrogen when reacted together?
(a) Copper and conc. nitric acid
(b) Ethanol and metallic sodium
(c) Magnesium and steam
(d) Phenol and metallic sodium
9. Which of the following is not a use of dihydrogen ?
(a) It used in fuel cells for generating electrical energy.
(b) Atomic hydrogen and oxy-hydrogen torches are used for cutting and
welding purposes.
(c) It used in the synthesis of hydroquinone and tartaric acid.
(d) Both (b) and (c)
10. At its melting point ice is lighter than water because
(a) H
2
O molecules are more closely packed in solid state
(b) ice crystals have hollow hexagonal arrangement of H
2
O molecules.
(c) on melting of ice the H
2
O molecule shrinks in size
(d) ice froms mostly heavy water on first melting.
11. Identify x and y in following reaction:
 y + 2H
+
(aq) + H
2
O
2
(aq)
(a) x = H
2
SO
4 
(aq), y =
(b) x = HO
3
SOOSO
3
H(aq), y =
(c) x = HO
3
SOOSO
3
H (aq), y = H
2
SO
4
(aq)
(d) x = H
2
SO
4
(aq) ,  y = HO
3
SOOSO
3
H(aq)
12. Which of the following statements in relation to the hydrogen atom is
correct ?
(a) 3s, 3p and 3d orbitals all have the same energy
(b) 3s and 3p orbitals are of lower energy than 3d orbital
(c) 3p orbital is lower in energy than 3d orbital
(d) 3s orbital is lower in energy than 3p orbital
13. Hydrogen molecules differs from chlorine molecule in the following
respect
(a) Hydrogen molecule is non-polar but chlorine molecule is polar
(b) Hydrogen molecule is polar while chlorine molecule is non-polar
(c) Hydrogen molecule can form intermolecular hydrogen bonds but
chlorine molecule does not
(d) Hydrogen molecule cannot participate in coordination bond formation
but chlorine molecule can
14. Which of the following chemicals is not present in clear hard water?
(a) MgCO
3
(b) MgSO
4
(c) Mg(HCO
3
)
2
(d) CaCl
2
15. Very pure hydrogen (99.9) can be made by which of the following
processes ?
(a) Reaction of methane with steam
(b) Mixing natural hydrocarbons of high molecular weight
(c) Electrolysis of water
(d) Reaction of salts like hydrides with water
16. Hydrogen peroxide acts both as an oxidising and as a reducing agent
depending upon the nature of the reacting species. In which of the
following cases H
2
O
2
 acts as a reducing agent in acid medium?
(a)
(b)
(c)
(d) KI
Page 5


PART-I (Single Correct MCQs)
1. Which statement is correct for hydrogen ?
(a) It has a very high ionisation potential
(b) It is always collected at cathode
(c) It can exist both in +1 as well as –1 oxidation state
(d) It has same electronegativity as halogens
2. The adsorption of hydrogen by metals is called
(a) Dehydrogenation
(b) Hydrogenation
(c) Occlusion
(d) Adsorption
3. Which of the following terms is not correct for hydrogen ?
(a) Its molecule is diatomic
(b) It exists both as H
+
 and H
–
 in different chemical compounds
(c) It is the only species which has no neutrons in the nucleus
(d) Heavy water is unstable because hydrogen is substituted by its isotope
deuterium
4. Hydrogen can be fused to form helium at
(a) High temperature and high pressure
(b) High temperature and low pressure
(c) Low temperature and high pressure
(d) Low temperature and low pressure
5. The hydride ion, H
–
, is a stronger base than the hydroxide ion, OH
–
.
Which one of the following reactions will occur if sodium hydride
(NaH) is dissolved in water?
(a)
(b)
(c)
(d)
6. Which of the following reactions is an example of use of water gas in
the synthesis of other compounds?
(a)
(b)
(c)
(d)
7. Elements of which of the following group(s) of periodic table do not
form hydrides?
(a) Groups 7, 8, 9
(b) Group 13
(c) Groups 15, 16, 17
(d) Group 14
8. Which one of the following pairs of substances will not produce
hydrogen when reacted together?
(a) Copper and conc. nitric acid
(b) Ethanol and metallic sodium
(c) Magnesium and steam
(d) Phenol and metallic sodium
9. Which of the following is not a use of dihydrogen ?
(a) It used in fuel cells for generating electrical energy.
(b) Atomic hydrogen and oxy-hydrogen torches are used for cutting and
welding purposes.
(c) It used in the synthesis of hydroquinone and tartaric acid.
(d) Both (b) and (c)
10. At its melting point ice is lighter than water because
(a) H
2
O molecules are more closely packed in solid state
(b) ice crystals have hollow hexagonal arrangement of H
2
O molecules.
(c) on melting of ice the H
2
O molecule shrinks in size
(d) ice froms mostly heavy water on first melting.
11. Identify x and y in following reaction:
 y + 2H
+
(aq) + H
2
O
2
(aq)
(a) x = H
2
SO
4 
(aq), y =
(b) x = HO
3
SOOSO
3
H(aq), y =
(c) x = HO
3
SOOSO
3
H (aq), y = H
2
SO
4
(aq)
(d) x = H
2
SO
4
(aq) ,  y = HO
3
SOOSO
3
H(aq)
12. Which of the following statements in relation to the hydrogen atom is
correct ?
(a) 3s, 3p and 3d orbitals all have the same energy
(b) 3s and 3p orbitals are of lower energy than 3d orbital
(c) 3p orbital is lower in energy than 3d orbital
(d) 3s orbital is lower in energy than 3p orbital
13. Hydrogen molecules differs from chlorine molecule in the following
respect
(a) Hydrogen molecule is non-polar but chlorine molecule is polar
(b) Hydrogen molecule is polar while chlorine molecule is non-polar
(c) Hydrogen molecule can form intermolecular hydrogen bonds but
chlorine molecule does not
(d) Hydrogen molecule cannot participate in coordination bond formation
but chlorine molecule can
14. Which of the following chemicals is not present in clear hard water?
(a) MgCO
3
(b) MgSO
4
(c) Mg(HCO
3
)
2
(d) CaCl
2
15. Very pure hydrogen (99.9) can be made by which of the following
processes ?
(a) Reaction of methane with steam
(b) Mixing natural hydrocarbons of high molecular weight
(c) Electrolysis of water
(d) Reaction of salts like hydrides with water
16. Hydrogen peroxide acts both as an oxidising and as a reducing agent
depending upon the nature of the reacting species. In which of the
following cases H
2
O
2
 acts as a reducing agent in acid medium?
(a)
(b)
(c)
(d) KI
17. Choose the correct statement :
The reason for use of polyphosphates as water softening agents is, that
(a) they form soluble complexes with anionic species
(b) they precipitate out cationic species
(c) they precipitate out anionic species
(d) they form soluble complexes with cationic species
18. Which statement is wrong?
(a) Ordinary hydrogen is an equilibrium mixture of ortho and para hydrogen
(b) In ortho hydrogen spin of two nuclei is in same direction
(c) Ortho and para forms do not resemble in their chemical properties
(d) In para hydrogen spin of two nuclei is in opposite direction.
19. From the following statements regarding H
2
O
2
, choose the incorrect
statement :
(a) It has to be stored in plastic or wax lined glass bottles in dark
(b) It has to be kept away from dust
(c) It can act only as an oxidizing agent
(d) It decomposes on exposure to light
20. Identify x and y in following reaction. What is the mixture of x and y
called?
CH
4
(g) + H
2
O(g) x + y
(a) x = CO
2
, y = H
2
O, water gas
(b) x = CO, y = H
2
O, syn gas
(c) x = CO, y = H
2
, water gas
(d) x = CO
2
, y = H
2
, syn gas
PART-II (Numeric / Integer Type Questions)