The correct order of acid strength of the following carboxylic acids is
Answer
(B)
I > II > III > IV
2
The green colour produced in the borax bead test of a chromium (III) salt is due to
Answer
(C)
Cr(BO2)3
3
Calamine, malachite, magnetic and cryolite, respectively, are
Answer
(D)
ZnCO3, CuCO3.Cu(OH)2, Fe3O4, Na3AlF6
4
Molar conductivity ($$\Lambda $$m) of aqueous solution of sodium stearate, which behaves as a strong electrolyte, is recorded at varying concentrations (C) of sodium stearate. Which one of the following plots provides the correct representation of micelle formation in the solution?
(critical micelle concentration (CMC) is marked with an arrow in the figures)
Answer
(C)
5
Choose the reaction(s) from the following options, for which the standard enthalpy of reaction of equal to the standard enthalpy of formation.
Answer
C
D
6
A tin chloride Q undergoes the following reactions (not balanced)
$$Q + C{l^ - } \to X$$
$$Q + M{e_3}N \to Y$$
$$Q + CuC{l_2} \to Z + CuCl$$
X is a monoanion having pyramidal geometry. Both Y and Z are neutral compounds.
Choose the correct option(s).
Answer
A
D
7
In the decay sequence.
x1, x2, x3 and x4 are particles/radiation emitted by the respective isotopes. The correct option(s) is(are)
Answer
A
B
C
8
Which of the following statement(s) is(are) correct regarding the root mean square speed (Urms) and average translational kinetic energy (Eav) of a molecule in a gas at equilibrium?
Answer
A
B
D
9
Choose the correct option(s) for the following set of reactions.
Answer
C
D
10
Which of the following statement(s) is(are) true?
Answer
A
C
D
11
Fusion of MnO2 with KOH in presence of O2 produces a salt W. Alkaline solution of W upon electrolytic oxidation yields another salt X. The manganese containing ions present in W and X, respectively, are Y and Z. Correct statement(s) is (are)
Answer
A
C
D
12
Each of the following options contains a set of four molecules. Identify the option(s) where all four molecules posses permanent dipole moment at room temperature.
Answer
A
C
13
Among B2H6, B3N3H6, N2O, N2O4, H2S2O3 and H2S2O8, the total number of molecules containing covalent bond between two atoms of the same kind is ...................
Answer
4
14
On dissolving 0.5 g of a non-volatile non-ionic solute to 39 g of benzene, its vapor pressure decreases from 650 mmHg to 640 mmHg. The depression of freezing point of benzene (in K) upon addition of the solute is .............
(Given data: Molar mass and the molal freezing point depression constant of benzene are 78 g mol-1 and 5.12 K kg mol-1, respectively).
Answer
1.02
15
Consider the kinetic data given in the following table for the reaction A + B + C $$ \to $$ Product.
The rate of the reaction for [A] = 0.15 mol dm-3, [B] = 0.25 mol dm-3 and [C] = 0.15 mol dm-3 is found to be Y $$ \times $$ 10-5 mol dm-3s-1. The value of Y is .................
Answer
6.75
16
For the following reaction, the equilibrium constant Kc at 298 K is 1.6 $$ \times $$ 1017.
Fe2+(aq) + S2-(aq) ⇌ FeS(s)
When equal volumes of
0.06 M Fe2+(aq) and 0.2 M S2$$ - $$(aq)
solutions are mixed, the equilibrium concentration of Fe2+(aq) is found by Y $$ \times $$ 10$$ - $$17 M. The value of Y is .................
Answer
8.9
17
At 143 K, the reaction of XeF4 with O2F2 produces a xenon compound Y. The total number of lone pair(s) of electrons present on the whole molecule of Y is .................
Answer
19
18
Schemes 1 and 2 describe the conversion of P to Q and R to S, respectively. Scheme 3 describes the synthesis of T from Q and S. The total number of Br atoms in a molecule of T is .................
