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Published on: 29/08/2019
Hydrogen
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Questions + Answers key
Take MCQ Chemistry Test
1.
Name the phenomenon of adsorption of hydrogen on metal surface.
2.
Name a substance which can oxidise H2O2.
3.
Which compounds cause temporary hardness of water?
4.
Write the Lewis structure of hydrogen peroxide.
5.
Name the compound each in which hydrogen exists in positive oxidation state
6.
Name the compound each in which hydrogen exists in negative oxidation state
7.
Which isotope of hydrogen is radioactive?
8.
Name the isotope of hydrogen which contains equal number of protons and neutrons.
9.
Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions?
10.
Calgon, which is used as a water softener, has the formula
Na4 [Na2 (PO3)6]
Na2 [Na4(PO3)6]
Na2 [Na4(PO4)5]
Na2 [Na2 (PO4)6]
11.
On treatment of hard water with zeolite, sodium ions get exchanged with
Ca2+ ions
Mg2+ ions
H+ ions
OH-
12.
Water may be softened using
sodium aluminium silicate
Graham's salt
an ion exchange resin
trisodium phosphate
13.
Hydrogen peroxide is used as
an oxidizing agent
a reducing agent
a bleaching agent
all of the above
14.
Hydrogen gas is generally prepared by the
reaction of granulated zinc with dilute H2SO4
reaction of zinc with conc. H2SO4
reaction of pure zinc with dil. H2SO4
action of steam on red hot coke.
1.
( )
Occlusion.
2.
( )
Acified KMnO4.
3.
( )
Ca(HCO3)2 and Mg (HCO3)2
4.
( )
the Lewis structure of hydrogen peroxide is
5.
( )
HCl, here oxidation state of hydrogen is +1.
6.
( )
NaH, here oxidation state of hydrogen is -1.
7.
( )
Tritium \(\left({ }_{1}^{3} \mathrm{H}\right)\) is radioactive because neutron/proton ratio is more than 1.5.
8.
( )
Deuterium ( \(_{ 1 }^{ 2 }{ H }\))
Number of protons (p) = number of electrons
= atomic number = 1
Number of neutrons (n) = Mass number - atomic number
= 2 - 1 = 1
9.
( )
Hydrogen atom has only one electron in its 1s-orbital. So, to achieve stable inert gas configuration of helium, it exists as diatomic molecule and is called dihydrogen.
10.
(b)
Na2 [Na4(PO3)6]
11.
(a)
Ca2+ ions
12.
(c)
an ion exchange resin
13.
(d)
all of the above
14.
(a)
reaction of granulated zinc with dilute H2SO4
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