Chapter: 11
Hydrogen and Water
MCQs:
Q.1: Select all those things which result when sodium metal is placed in a beaker of water:
Water becomes acidic
Sodium disappears after sometime
H2 and NaOH
No action
Q.2: Hydrogen is a diatomic molecule with bond energy:
100 K.J / MOL
104 K.Cal / MOL
150 K.Cal / MOL
200 KJ / MOL
Q.3: Deuterium is present in natural hydrogen in the ratio:
10050000
115000
1.0
11200
Q.4: A human being consumes water about --------- every day.
2 Liter
10 Liter
1 Liter
5 Liter
Q.5: Polluted water is -------- for drinking purposes.
Unfit
Used
Useful
Fit
Q.6: MOL.Mass of heavy water is:
18 a.m.u
20 a.m.u
16 a.m.u
22 a.m.u
Q.7: The maximum density of water at 4oC is:
1.0g/cm3
1.2g/dm3
0.998g/cm3
0.918g/cm3
Q.8: The freezing point of heavy water is:
4oC
1oC
0oC
3.81oC
Q.9: Cavendish in 1766 discovered.
Hydrogen
Helium
Oxygen
Nitrogen
Q.10: Sun and other stars are largely composed of:
Nitrogen
Oxygen
Hydrogen
Helium
Q.11: In the earth crust, hydrogen is the ---------- most abundant element:
9th
8th
7th
10th
Q.12: Water gas is a mixture of hydrogen H2 and
SO2
Cl2
CO2
CO
Q.13: During the reaction of natural gas and steam, the catalyst used is:
Cr
Zn
Fe
Ni
Q.14: Hydrogen has ---------- isotopes.
4
2
3
5
Q.15: The number of electron hydrogen contains in its K shell is:
4
2
1
3
Q.16: Smallest element by size is?
Nitrogen
Oxygen
Helium
Hydrogen
Q.17: Gas filled in weather balloon is?
Hydrogen
Ammonia
Nitrogen
Oxygen
Q.18: Carbon black and H2 are formed when ---------- is decomposed thermally above 700oC.
OC
CH2 = CH2
CO2
CH4
Q.19: In sodium hydride NaH oxidation sate of hydrogen is?
2
1
-2
-1
Q.20: Atomic hydrogen is called?
Tritium
Deuterium
Protium
Nascent hydrogen
Q.21: The most common substance known and remarkable is
Hydrogen
Water
Oxygen
Nitrogen
Q.22: Water shows anomalous behavior between
0 to 4oC
0 to 5oC
0 to -4oC
4 to 0oC
Q.23: The density of ice at 0oC is:
0.99 8g/cm3
0.998 g/cm3
0.918 g/cm3
0.981 g/cm3
Q.24: The density of liquid water at 0oC is:
0.99 8g/cm3
0.998 g/cm3
0.918 g/cm3
0.981 g/cm3
Q.25: When mater reacts with more electro-positive metals, it gives of metals
Oxides
Hydroids
Peroxides
Hydroxide
Q.26: Water containing dissolved impurities of hydrogen carbonates, chloride and sulfates of calcium and magnesium is called
Heavy water
Soft water
Natural water
Hard Water
Q.27: Temporary hardness of water is due to the presence of dissolve hydrogen carbonates of
Ca and Mg
Ba and strontium
Na and K
Zn and Ni
Q.28: Permanent hardness of water is due to the presence of dissolved and sulfates of Ca and Mg.
Carbonate
Chlorides
Nitrates
Bromides
Q.29: Permanent hardness of water can be removed by
Heating
Clark’s Method
Ion exchange method
None of these
Q.30: Permutit is:
Potassium zeolite
Sodium zeolite
Calcium zeolite
Magnesium zeolite
Q.31: Molecular formula of heavy water is:
D2O
A2O
H2O
C2O
Q.32: The salt containing water molecules as water of crystallization are called
Oxides
Hydrides
Hygroscopic
Hydrates
Q.33: Disease caused by contaminated water containing microbes is
Malaria
Myopia
Cholera
None of these
Q.34: The water fit for drinking purpose is
Natural
Treated water
Distilled water
Potable water
Q.35: Which treatment is used to destroy bacteria and pathogenic organism in water.
Hydrogenation
Filtration
Chlorination
Coagulation
Q.36: Nascent hydrogen is more reactive than molecular hydrogen because:
It is in atomic state
It has less amount of energy
It is lighter in mass
It is stable
Q.37: Hydrogen burns with a:
Golden yellow flame
Blue flame
Crimson flame
Green flame
Q.38: Water has the maximum density at:
0oC
100oC
4.5oC
4oC
Q.39: Hydrogen’s electro-negativity (E.N) is:
0.8
2.1
1.2
3.5
Q.40: Natural hydrogen contains …………. Percent deuterium.
0.156
0.0156
0.146
0.0146
Q.41: Ice floats over water because ice is ………..than water.
No density
more density
less density
None of these
Q.42: ………..gave the name hydrogen to this gas.
Cavendish
Lavoiser
Clark’s
None of these
Q.43: ………..is the nuclear fuel consumed by the sun and stars.
Nitrogen
Oxygen
Water
Hydrogen
Q.44: Water which forms scum with soap is called
Hard water
Soft water
Distilled water
Un-distilled water
Q.45: Property due to which water acts as a universal solvent is
Polarity
It's ability to make hydrogen bond
Both A and B
Strong dipole-dipole interaction
Q.46: The ratio of hydrogen (H) and oxygen (O) in water molecule by volume is
2: 1
1: 2
3: 1
4: 1
Q.47: Natural water is
Pure
Impure
Acts as solute
Distilled
Q.48: Temporary hardness can be removed by adding
Lime
Carbon
Oxygen
Slaked lime
Q.49: Water exist in only
One state
Two state
Three states
Four states
Q.50: How to create water for chemistry
D2O
H2O
HH2O
H₄C
Q.51: It exists as ..............molecular gas (H2).
Mono-atomic
Di-atomic
Tri-atomic
None of these
Q.52: Hydrogen is the …………….element known.
Heaviest
No mass
Lightest
None of these
Q.53: The addition of hydrogen into molecular compounds is called……… reaction.
Hydrogenation
Filtration
Chlorination
Coagulation
Q.54: hydrogen is a …………..,
Colourful
Multi-colour
Colourless
None of these
Q.55: In water …………by mass is hydrogen.
11.11%
11.12%
11.13%
11.14%
Q.56: Molecular mass of hydrogen is:
2.013 a.m.u
2.014 a.m.u
2.015 a.m.u
2.016 a.m.u
Q.57: Hydrogen is highly …………and burns with blue flame.
Flammable
In-Flammable
Soluble
In-soluble
Q.58: Water is called as a……….
Universal solute
Universal solvent
Solute
solvent
Q.59: Atomic number of hydrogen is:
4
3
2
1
Q.60: Tritium is an isotope of hydrogen and its mass number is:
1
2
3
4
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