JEE MAIN - Chemistry (2013 (Offline))

1
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 37.0^oC. 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)
پاسخ دهید
(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?
پاسخ دهید
(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:
پاسخ دهید
(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 :
پاسخ دهید
(D)
$$C{H_3}C{H_2}COOH$$
5
Arrange the following compounds in order of decreasing acidity :

پاسخ دهید
(C)
$${\rm I}{\rm I}{\rm I} > {\rm I} > {\rm I}{\rm I} > {\rm I}V$$
6
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 $$(A).$$
پاسخ دهید
(D)
7
The order of stability of the following carbocations :

پاسخ دهید
(D)
$${\rm I}{\rm I}{\rm I} > {\rm I} > {\rm I}{\rm I}$$
8
Synthesis of each molecule of glucose in photosynthesis involves:
پاسخ دهید
(D)
18 molecules of ATP
9
The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was:
پاسخ دهید
(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:
پاسخ دهید
(A)
tertiary alcohol by S_N1
11
Which of the following complex species is not expected to exhibit optical isomerism?
پاسخ دهید
(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?
پاسخ دهید
(C)
Co (Z = 27)
13
Which of the following arrangements does not represent the correct order of the property stated against it?
پاسخ دهید
(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)
پاسخ دهید
(D)
53.6 kJ mol^–1
15
Given

$$E_{C{r^{2 + }}/Cr}^o$$ = -0.74 V; $$E_{MnO_4^ - /M{n^{2 + }}}^o$$ = 1.51 V

$$E_{C{r_2}O_7^{2 - }/C{r^{3 + }}}^o$$ = 1.33 V; $$E_{Cl/C{l^ - }}^o$$ = 1.36 V

Based on the data given above, strongest oxidising agent will be :
پاسخ دهید
(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:
پاسخ دهید
(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 :
پاسخ دهید
(B)
carbocation
18
Stability of the species Li₂, $$Li_2^−$$ and $$Li_2^+$$ increases in the order of:
پاسخ دهید
(C)
$$Li_2^-$$ <$$Li_2^+$$ < Li₂
19
In which of the following pairs of molecules/ions, both the species are not likely to exist?
پاسخ دهید
(C)
$$H_2^{2+}$$ , $$He_2$$
20
Which one of the following molecules is expected to exhibit diamagnetic behaviour?
پاسخ دهید
A
D
21
The first ionization potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be:
پاسخ دهید
(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?
پاسخ دهید
(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)
پاسخ دهید
(D)
1.214 × 10⁻⁷ m
24
Experimentally it was found that a metal oxide has formula M_0.98O. Metal M, present as M²⁺ and M³⁺ in its oxide. Fraction of the metal which exists as M³⁺ would be
پاسخ دهید
(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
پاسخ دهید
(D)
C₇H₈
26
Consider the following reaction:

$$xMnO_4^- + yC_2O_4^{2-}$$ + zH⁺ $$\to$$ xMn²⁺ + 2yCO₂ + $${z \over 2}{H_2}O$$

The value's of x, y and z in the reaction are, respectively :
پاسخ دهید
(C)
2, 5 and 16