The atomic masses of He and Ne are 4 and 20 a.m.u., respectively. The value of the de Broglie wavelength
of He gas at –73oC is “M” times that of the de Broglie wavelength of Ne at 727oC. M is
Answer
5
2
The total number of lone-pairs of electrons in melamine is
Answer
6
3
The standard enthalpies of formation of CO2(g), H2O(l) and glucose(s) at 25oC are –400 kJ/mol,
–300 kJ/mol and –1300 kJ/mol, respectively. The standard enthalpy of combustion per gram of glucose at
25oC is
Answer
(C)
–16.11 kJ
4
The initial rate of hydrolysis of methyl acetate (1M) by a weak acid (HA, 1M) is 1/100th of that of a strong acid (HX, 1M), at 25oC. The Ka of HA is
Answer
(A)
1 $$\times$$ 10-4
5
The hyperconjugative stabilities of tert-butyl cation and 2-butene, respectively, are due to
Answer
(A)
$$\sigma \to p$$ (empty) and $$\sigma \to \pi^*$$ electron delocalisations
6
Methylene blue, from its aqueous solution, is adsorbed on activated charcoal at 25oC. For this process, the
correct statement is
Answer
(B)
The adsorption is accompanied by a decrease in enthalpy
7
Benzene and naphthalene form an ideal solution at room temperature. For this process, the true statement(s)
is(are)
Answer
B
C
D
8
Sulphide ores are common for the metals
Answer
(A)
Ag, Cu and Pb
9
KI in acetone, undergoes SN2 reaction with each of P, Q, R and S. The rates of the reaction vary as
Answer
(B)
S > P > R > Q
10
The compound that does NOT liberate CO2, on treatment with aqueous sodium bicarbonate solution, is
The correct order of the complex ions, according to their spin-only magnetic moment values (in B.M.) is
Answer
(B)
Q < R < P
12
In the reaction, P + Q $$\to$$ R + S, the time taken for 75% reaction of P is twice the time taken for 50% reaction of P. The concentration of Q varies with reaction time as shown in the figure. The overall order of the reaction is
Answer
(D)
1
13
Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of
Answer
(B)
NO2
14
The arrangement of X$$-$$ ions around A+ ion in solid AX is given in the figure (not drawn to scale). If the radius of X$$-$$ is 250 pm, the radius of A+ is
Answer
(A)
104 pm
15
Upon treatment with ammoniacal H2S, the metal ion that precipitates as a sulphide is
Answer
(D)
Zn(II)
16
The pair(s) of coordination complexes/ions exhibiting the same kind of isomerism is(are)
Answer
B
D
17
Among P, Q, R and S, the aromatic compound(s) is(are)
Answer
A
B
C
D
18
The total number of carboxylic acid groups is the product P is _________.
Answer
2
19
EDTA4$$-$$ is ethylenediaminetetraacetate ion. The total number of N$$-$$Co$$-$$O bond angles in [Co(EDTA)]1$$-$$ complex ion is ________.
Answer
8
20
A tetrapeptide has $$-$$COOH group on alanine. This produces glycine (Gly), valine (Val), phenyl alanine (Phe) and alanine (Ala), on complete hydrolysis. For this tetrapeptide, the number of possible sequences (primary structures) with $$-$$NH2 group attached to a chiral center is _______.
