A piston filled with 0.04 mol of an ideal gas expands reversibly from 50.0 mL to 375 mL at a constant
temperature of 37.0oC. As it does so, it absorbs 208J of heat. The values of q and w for the process will be :
(R = 8.314 J/mol K) ( l n 7.5 = 2.01)
答え
(D)
q = + 208 J, w = – 208 J
2
How many litres of water must be added to 1 litre of an aqueous solution of HCl with a pH of 1 to create an
aqueous solution with pH of 2?
答え
(D)
9.0 L
3
A compound with molecular mass 180 is acylated with CH3COCl to get a compound with molecular mass
390. The number of amino groups present per molecule of the former compound is:
答え
(B)
5
4
An organic compound A upon reacting with $$N{H_3}$$ gives $$B.$$ On heating $$B$$ gives $$C.$$ $$C$$ in presence of $$KOH$$ reacts with $$B{r_2}$$ to given $$C{H_3}C{H_2}N{H_2}2.$$ $$A$$ is :
答え
(D)
$$C{H_3}C{H_2}COOH$$
5
Arrange the following compounds in order of decreasing acidity :
Compound $$\left( A \right),\,{C_8}{H_9}Br,\,\,\,$$ gives a white precipitate when warmed with alcoholic $$AgN{O_3}.$$ Oxidation of $$(A)$$ gives an acid $$\left( B \right),$$ $${C_8}{H_6}{O_4}.\,\,\left( B \right)$$ easily forms anhydride on heating. Identify the compound $$(A).$$
答え
(D)
7
The order of stability of the following carbocations :
Synthesis of each molecule of glucose in photosynthesis involves:
答え
(D)
18 molecules of ATP
9
The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was:
答え
(D)
Methyl isocyanate
10
An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary,
secondary or tertiary. Which alcohol reacts fastest and by what mechanism:
答え
(A)
tertiary alcohol by SN1
11
Which of the following complex species is not expected to exhibit optical isomerism?
答え
(B)
[Co (NH3)3 Cl3]
12
Four successive members of the first row transition elements are listed below with atomic numbers. Which
one of them is expected to have the highest $$E_{{M^{3 + }}/{M^{2 + }}}^0$$ value?
答え
(C)
Co (Z = 27)
13
Which of the following arrangements does not represent the correct order of the property stated against it?
答え
(D)
V2+ < Cr2+ < Mn2+ < Fe2+ : paramagnetic behaviour
14
The rate of a reaction doubles when its temperature changes from 300K to 310K. Activation energy of such
a reaction will be:(R = 8.314 JK–1 mol–1 and log 2 = 0.301)
Based on the data given above, strongest oxidising agent will be :
答え
(C)
$$MnO_4^ - $$
16
The molarity of a solution obtained by mixing 750 mL of 0.5 (M) HCl with 250 mL of 2(M) HCl will be:
答え
(D)
0.875 M
17
A solution of (–$$l$$) – chloro –1 – phenylethane in toluene racemises slowly in the presence of a small
amount of SbCl5, due to the formation of :
答え
(B)
carbocation
18
Stability of the species Li2, $$Li_2^−$$ and $$Li_2^+$$ increases in the order of:
答え
(C)
$$Li_2^-$$ <$$Li_2^+$$ < Li2
19
In which of the following pairs of molecules/ions, both the species are not likely to exist?
答え
(C)
$$H_2^{2+}$$ , $$He_2$$
20
Which one of the following molecules is expected to exhibit diamagnetic behaviour?
答え
A
D
21
The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+
will be:
答え
(A)
– 5.1 eV
22
Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se
and Ar?
答え
(B)
Ba < Ca < Se < S < Ar
23
Energy of an electron is given by $$E = - 2.178 \times {10^{ - 18}}J\left( {{{{Z^2}} \over {{n^2}}}} \right)$$. Wavelength of light required to excite an
electron in an hydrogen atom from level n = 1 to n = 2 will be
(h = 6.62 × 10−34 Js and c = 3.0 × 108 ms−1)
答え
(D)
1.214 × 10−7 m
24
Experimentally it was found that a metal oxide has formula M0.98O. Metal M, present as M2+ and M3+ in its oxide. Fraction of the metal which exists as M3+ would be
答え
(B)
4.08%
25
A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO2. The empirical formula of the hydrocarbon is
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