JEE MAIN - Chemistry (2018 - 15th April Evening Slot)
1
The increasing order of diazotisation of the following compounds is :
Answer
(B)
(a) < (d) < (b) < (c)
2
The major product formed in the following reaction is :
Answer
(A)
3
The total number of optically active compounds formed in the following reactio is :
Answer
(B)
Four
4
The dipeptide, Gln-Gly, on treatment with CH3COCl followed y aqueous work up gives :
Answer
(C)
5
When 2-butyne is treate with H2/Lindlar's catalyst, compound X is produced as the major product and when treated with Na/liq. NH3 it produces Y as the major product Which of the following statements is correct ?
Answer
(A)
X will have higher dipole moment and higher boiling point than Y.
6
Which of the following best describes the diagram below of a molecular orbital ?
Answer
(D)
An antibonding $$\pi $$ orbital
7
The increasing order of the acidity of the following carboxylic acids is :
Answer
(D)
III < II < IV < I
8
On treatment of the following compound with a strong acid, the most susceptible site for bond cleavage is :
Answer
(D)
O5 $$-$$ C6
9
The major product formed in the following reaction is :
Answer
(D)
10
Two compounds I and II are eluted by column chromatography (adsorption of I > II). Which one of following is a correct statement ?
Answer
(B)
II movesfaster and has higher Rf value than I
11
The total number of possible isomers for square-planar [Pt(Cl)(NO2)(NO3)(SCN)]2- is :
Answer
(B)
12
12
Two 5 molal solutions are prepared by dissolving a non-electrolyte non-volatile solute separately in the solvents X and Y. The molecular weights of the solvents are Mx and My, respectively where Mx = $${3 \over 4}$$ My. The relative lowering of vapor pressure of the solution in X is ''m'' times that of the solution in Y. Given that the number of moles of solute is very small in comparison to that of the solvent, the value of ''m'' is :
Answer
(B)
$${3 \over 4}$$
13
$$\Delta $$fGo at 500 K for substance 'S' in liquid state and gaseous state are +100.7 kcl mol-1 and +103 kcal mol-1, respectively. Vapour pressure of liquid 'S' at 500 K is approximately equal to : ( R = 2 cal K-1 mol-1 )
Answer
(A)
0.1 atm
14
For a first order reaction, A $$ \to $$ P, t1/2 (half-life) is 10 days The time required for $${1 \over 4}$$th conversion of A (in days) is : (ln 2 = 0.693, ln 3 = 1.1)
Answer
(C)
4.1
15
The correct order of spin-only magnetic moments among the following is :
(Atomic number : Mn = 25, Co = 27, Ni = 28, Zn = 30)
Answer
(D)
[MnCl4]2- > [CoCl4]2- > [NiCl4]2- > [ZnCl4]2-
16
The correct order of electron affinity is :
Answer
(C)
Cl > F > O
17
In KO2, the nature of oxygen species and the oxydation state of oxygen atom are, respectively :
Answer
(B)
Superoxide and $$-$$ 1/2
18
At a certain temperature in a $$5$$ $$L$$ vessel, 2 moles of carbon monoxide and 3 moles of chlorine were allowed to reach equilibrium according to the reaction,
CO + Cl2 $$\rightleftharpoons$$ COCl2 At equilibrium, if one mole of CO is present then equilibrium constant (Kc) for the reaction is :
Answer
(B)
2.5
19
Following four solutions are prepared by mixing different volumes of NaOH and HCl of different concentrations, pH of which one of them will be equal to 1 ?
Answer
(B)
75 mL $${M \over {5}}$$ HCl + 25 mL $${M \over {5}}$$ NaOH
20
Given
(i) 2Fe2O3(s) $$ \to $$ 4Fe(s) + 3O2(g);
$$\Delta $$rGo = + 1487.0 kJ mol-1
(ii) 2CO(g) + O2(g) $$ \to $$ 2CO2(g);
$$\Delta $$rGo = $$-$$ 514.4 kJ mol-1
Free energy change, $$\Delta $$rGo for the reaction
2Fe2O3(s) + 6CO(g) $$ \to $$ 4Fe(s) + 6CO2(g) will be :
Answer
(B)
$$-$$ 56.2 kJ mol-1
21
The de-Broglie's wavelength of electron present in first Bohr orbit of 'H' atom is :
For per gram of reactant, the maximum quantity of N2 gas is produced in which of the following thermal decomposition reactions ?
(Given : Atomic wt. - Cr = 52 u, Ba = 137 u)
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