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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test 1 Mark Questions 2020 - Part Two
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.
Oil of mirbane is ________
nitrobenzene
benzaldehyde
methyl salicylate
aspirin
2.
Which of the following nitro-compounds behave as an acid in the presence of strong alkali?
Primary
Secondary
Tertiary
Primary and Secondary
3.
Which gives an yellow oil with nitrous acid?
1° amine
2° amine
3° amine
quarternary salt
4.
Which among the following exists as zwitter ion?
sulphanilic acid
salicylic acid
acetanilide
all the above
5.
The above structure represents
Vitamin B12
Vitamine B6
dopamine
Histamine
6.
The sugar unit present in nucleic acid is___________
a hexose
tetrose
pentose
glucose
7.
Amino acids are bifunctional containing ________ group.
CHO and COOH
OH and COOH
NH2 and COOH
NO2 and COOH
8.
The general formula of carbohydrates is_____
Cn(H2O)
Cn(H2O)
C(H2O)n
H(CO2)
9.
The disaccharide found in milk of mammals and referred as milk sugar is________
Lactose
Engthrose
Galactose
Erythrulose
10.
The ultimate product of hydrolysis of starch in the presence of dilute acid is
dextrin
maltose
maltase
glucose
11.
Fructose on reduction with HI/P gives
n-hexane
iso-hexane
10 alcohol
no reaction
12.
Two amino acids say A, B react to give
two dipeptides
three dipeptides
four dipeptides
only one
13.
The acid that cannot be prepared by Grignard reagent _______.
acetic acid
formic acid
butyric acid
benzoic acid
14.
Methyl ketones are usually characterised by _______.
the Fehling's solution
the iodoform test
the Schiff's test
the Tollen's reagent
15.
Which of the following reaction is not correct.
CH3 CH2 NH2 \(\overset { { HNO }_{ 2 } }{ \longrightarrow } \)CH3CH2 OH + N2
CH2 CONH2 \(\overset { { Br }_{ 2 }/NaOH }{ \longrightarrow } \)CH3 NH2
none of these
16.
While charging lead storage battery _______.
PbSO4 on cathode is reduced to Pb
PbSO4 on anode is oxidised to PbO2
PbSO4 on anode is reduced to Pb
PbSO4 on cathode is oxidised to Pb
17.
Cinnabar is the sulphide ore of _________ metal.
Zn
Pb
Hg
Ag
18.
For a first order reaction A ⟶ product with initial concentration x mol L-1, has a half life period of 2.5 hours. For the same reaction with initial concentration \(\left( \frac { x }{ 2 } \right) \) mol L-1 the half life is
(2.5 x 2) hours
\(\left( \frac { 2.5 }{ 2 } \right) \) hours
2.5 hours
Without knowing the rate constant, t1/2 cannot be determined from the given data
19.
The number of carbon atoms per unit cell of diamond is _______.
8
6
1
4
20.
A magnetic moment of 1.73BM will be shown by one among the following.
TiCl4
[CoCl6]4-
[Cu(NH3)4]2+
[Ni(CN)4]2-
21.
The magnetic moment of Mn2+ ion is _______.
5.92BM
2.80BM
8.95BM
3.90BM
22.
In the brown ring test, brown colour of the ring is due to _______.
a mixture of No and NO2
Nitroso ferrous sulphate
Ferrous nitrate
Ferric nitrate
23.
The element that does not show catenation among the following p-block elements is ________.
Carbon
silicon
Lead
germanium
24.
Electrochemical process is used to extract_______.
Iron
Lead
Sodium
silver
25.
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
\(\Delta { G }_{ f }^{ 0 }\) of sulphide is greater than those for CS2 and H2S
\(\Delta { G }_{ r }^{ 0 }\) is negative for roasting of sulphide ore to oxide
Roasting of the sulphide to its oxide is thermodynamically feasible
Carbon and hydrogen are suitable reducing agents for metal sulphides
1.
(a)
nitrobenzene
2.
(a)
Primary
3.
(b)
2° amine
4.
(a)
sulphanilic acid
5.
(b)
Vitamine B6
6.
(c)
pentose
7.
(c)
NH2 and COOH
8.
(b)
Cn(H2O)
9.
(a)
Lactose
10.
(d)
glucose
11.
(a)
n-hexane
12.
(d)
only one
13.
(b)
formic acid
14.
(b)
the iodoform test
15.
(b)
16.
Charging anode:
PbSO4(s) + 2e- ➝ Pb(s) + SO42-(aq)
Cathode:
PbSO4(s) + 2H2O(I) ➝ PbO2(s) + SO42-(aq) + 2e-
17.
(c)
Hg
18.
For a first order reaction
t1/2 = \(\frac { 0.693 }{ { k }}\)
t1/2 does not depend on the initial concentration and it remains constant (whatever may be the initial concentration)
t1/2 = 2.5 hrs
19.
(a)
8
20.
Ti4+ (d0 ⇒ 0BM)
Co2+ (d7 spain free ⇒ t2g5, e2g; n = 3; μ = 3.9BM)
Cu2+ (d9 Low spain ⇒ t2g6, e3g; n = 1; μ = 1.732BM)
Ni2+ (d8 Low spain ⇒ t2g6, e2g; n = 2; μ = 2.44 BM)
21.
Mn2+ ⇒ 3d5 contains 5 unpaired electrons
n = 5,
\( \sqrt{n(n+ 2)} \) BM
\(= \sqrt{5(5+ 2)} = \sqrt{35} = 5.92 BM\)
22.
(b)
Nitroso ferrous sulphate
23.
(c)
Lead
24.
(c)
Sodium
25.
(d)
Carbon and hydrogen are suitable reducing agents for metal sulphides
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