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Published on: 13/10/2020
12th Standard Chemistry p Block Elements II English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Chemistry Test
1.
Helium is used in balloons in the place of hydrogen because it is________.
incombustible
radioactive and detected easily
lighter than hydrogen
both (a) and (c)
2.
Oxidation states of P in H4P2O5, H4P2O6, H4P2O7 are respectively _______.
+3, +4, +5
+3, +5, +4
+5, +3, +4
+5, +4, +3
3.
Repeated use of which one of the following fertilizers would increase the activity of the soil_______.
Ammonium sulphate
Superphosphate of lime
Urea
Potassium nitrate
4.
Maximum covalent character is shown by________.
PCl3
NCl3
AsCl3
SbCl3
5.
The incorrect statement among the following is _________.
Reducing character of hydrides of group 15 increases down the group
Basicity of hydrides of group 15 increases down the group
NCl5 does not exist
Phosphorus and arsenic can form P\(\pi \)-d\(\pi \) bond but not nitrogen
6.
Which among the following ion is not formed?
F3-
C13-
Br3-
I3-
7.
Oxalic acid on heating with cone H2SO4 gives ______.
CO only
CO2 only
CO2 + H2O
CO + CO2 + H2O
8.
When Copper is heated with cone HNO3 it produces
Cu (NO3)2 and N2O
Cu (NO3)2 and NO2
Cu (NO3)2 and NO
Cu (NO3)2 NO and N2O
9.
Pick the wrong one among the following
F2 - Yellow
Br2 - Red
Cl2 - Colourless
I2- Violet
10.
Allotrope of sulphur which shows paramagnetic behaviour _______.
S8- Rhombic
S8- Monoclinic
S2- In vapour phase
Not possible
11.
Which is dibasic?
Orthophosphoric acid
Pyrophosphoric acid
Orthophosphorus acid
Hypophosphorous acid
12.
Catenation property of group 15 elements, follow the order _______.
N < P < As < Sb < Bi
P >> N > As > Sb > Bi
P < N < As < Sb < Bi
N>> P > As > Sb > Bi
13.
When copper is heated with conc HNO3 it produces ________.
Cu(NO3)2, NO and NO2
Cu(NO3)2 and N2O
Cu(NO3)2 and NO2
Cu(NO3)2 and NO
14.
Which one of the following orders is correct for the bond dissociation enthalpy of halogen molecules?
Br2 > I2 > F2 > Cl2
F2 > Cl2 > Br2 > l2
I2 > Br2 > Cl2 > F2
Cl2 > Br2 > F2 > I2
15.
Most easily liquefiable gas is _______.
Ar
Ne
He
Kr
16.
The basicity of pyrophosphorous acid ( H4P2O5) is _______.
4
2
3
5
17.
On hydrolysis, PCl3 gives________.
H3PO3
PH3
H3PO4
POCl3
18.
Solid (A) reacts with strong aqueous NaOH liberating a foul smelling gas(B) which spontaneously burn in air giving smoky rings. A and B are respectively_________.
P4(red) & PH3
P4(white) & PH3
S8 & H2S
P4(white) & H2S
19.
Which is true regarding nitrogen?
least electronegative element
has low ionisation enthalpy than oxygen
d- orbitals available
ability to form pπ-pπ bonds with itself
20.
1.
(d)
both (a) and (c)
2.
(a)
+3, +4, +5
3.
(a)
Ammonium sulphate
4.
(b)
NCl3
5.
(d)
Phosphorus and arsenic can form P\(\pi \)-d\(\pi \) bond but not nitrogen
6.
(a)
F3-
7.
(d)
CO + CO2 + H2O
8.
(b)
Cu (NO3)2 and NO2
9.
(c)
Cl2 - Colourless
10.
(c)
S2- In vapour phase
11.
(c)
Orthophosphorus acid
12.
(b)
P >> N > As > Sb > Bi
13.
(c)
Cu(NO3)2 and NO2
14.
(d)
Cl2 > Br2 > F2 > I2
15.
(d)
Kr
16.
(b)
2
17.
(a)
H3PO3
18.
(b)
P4(white) & PH3
19.
(d)
ability to form pπ-pπ bonds with itself
20.
(d)
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