12th Standard Syllabus & Materials
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Published on: 13/10/2020
12th Standard Chemistry English Medium Free Online Test Book Back One Mark Questions
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1.
For Freundlich isotherm a graph of log \(\frac{x}{m}\) is plotted against log P. The slope of the line and its y – axis intercept respectively corresponds to________.
\(\frac{1}{n}\), K
log\(\frac{1}{n}\), K
\(\frac{1}{n}\), log K
log \(\frac{1}{n}\), log K
2.
3.
Concentration of the Ag+ ions in a saturated solution of Ag2C2O4 is 2.24 ×10-4mol L-1 solubility product of Ag2C2O4 is_______.
2.42 × 10-8mol3L-3
2.66 × 10-12mol3L-3
4.5 × 10-11mol3L-3
5.619 × 10-12mol3L-3
4.
For a first order reaction A ⟶ B the rate constant is x min−1. If the initial concentration of A is 0.01M, the concentration of A after one hour is given by the expression.
001. e−x
1 x 10-2(1-e-60x)
(1 x 10-2)e-60x
none of these
5.
Graphite and diamond are ________.
Covalent and molecular crystals
ionic and covalent crystals
both covalent crystals
both molecular crystals
6.
The sum of primary valence and secondary valence of the metal M in the complex [M(en)2(Ox)]Cl is________.
3
6
-3
9
7.
Sc (Z = 21) is a transition element but Zinc (z = 30) is not because _______.
both Sc3+ and Zn2+ ions are colourless and form white compounds
In case of Sc, 3d orbital are partially filled but in Zn these are completely filled
last electron as assumed to be added to 4s level in case of zinc
both Sc and Zn do not exhibit variable oxidation states
8.
In which of the following, NH3 is not used?
Nessler's reagent
Reagent for the analysis of IV group basic radical
Reagent for the analysis of III group basic radical
Tollen's reagent
9.
An aqueous solution of borax is________.
neutral
acidic
basic
amphoteric
10.
Bauxite has the composition ______.
Al2O3
Al2O3.nH2O
Fe2O3.2H2O
None of these
1.
\(\frac{x}{m}\) = K.p1/n
log \((\frac{x}{m})\) = log K + \(\frac{1}{n}\), log p
y = c + mx
m = 1/n and c = log K
2.
(c)
3.
\(\mathrm{Ag}_{2} \mathrm{C_2O_4} \rightleftharpoons 2 \mathrm{Ag}_{}^{+}+\mathrm{C_2O}_{4{}}^{2-}\)
\(\left[\mathrm{Ag}^{+}\right]=2 .24 \) ×10-4mol L-1
\(\mathrm{C_2O}_{4{}}^{2-} = \frac {2.24 \times 10 ^{-4}}{2}\) mol L-1
= 1.12 ×10-4mol L-1
Ksp = [Ag]2 [C2O42-]
= (2.24 ×10-4mol L-1) (1.12 ×10-4mol L-1)
= 5.619 × 10-12mol3L-3
4.
\(k=\frac { 2.303 }{ t } log\frac { \left[ { A }_{ 0 } \right] }{ \left[ A \right] } \)
\(k=\frac { 1 }{ t } ln \frac { \left[ { A }_{ 0 } \right] }{ \left[ A \right] } \)
\(e^{kt}=\frac { \left[ { A }_{ 0 } \right] }{ \left[ A \right] }\)
[A] = [A0] ekt
In this case
k = x min-1 and [A0] = 0.01 M = 1 x 10-2M
t = 1 hour = 60 min
[A] = (1 x 10-2)e-60x
5.
(c)
both covalent crystals
6.
In the complex [M(en)2(Ox)]Cl For the central metal ion M3+
The primary valence is = +3
The secondary valence = 6
sum of primary valence and secondary valence = 3 + 6 = 9
7.
(b)
In case of Sc, 3d orbital are partially filled but in Zn these are completely filled
8.
(a)
Nessler's reagent
9.
(c)
basic
10.
(b)
Al2O3.nH2O
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