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JEE MAIN - Chemistry (2019 - 10th April Evening Slot)

1
The increasing order of nucleophilicity of the following nucleophiles is :
(a) CH3CO2$$-$$           (b) H2O
(c) CH3SO3$$-$$           (d) $$\mathop O\limits^ - H$$
Answer
(A)
(b) < (c) < (a) < (d)
2
The major product 'Y' in the following reaction is :
Answer
(A)
3
Which one of the following graphs between molar conductivity ($${\Lambda _m}$$) versus $$\sqrt C $$ is correct ?
Answer
(A)
4
The crystal field stabilization energy (CFSE) of [Fe(H2O)6]Cl2 and K2[NiCl4] respectively, are :
Answer
(A)
– 0.4 $$\Delta $$0 and – 0.8 $$\Delta $$t
5
Which of these factors does not govern the stability of a conformation in acyclic compounds?
Answer
(A)
Angle strain
6
The pH of a 0.02 M NH4Cl solution will be :
[given Kb (NH4OH) = 10–5 and log 2 = 0.301]
Answer
(B)
5.35
7
The difference between $$\Delta $$H and $$\Delta $$U ($$\Delta $$H – $$\Delta $$U), when the combustion of one mole of heptane(l) is carried out at a temperature T, is equal to :
Answer
(A)
– 4 RT
8
1 g of a non-volatile non-electrolyte solute is dissolved in 100 g of two different solvents A and B whose ebullioscopic constants are in the ratio of 1 : 5. The ratio of the elevation in their boiling points, $${{\Delta {T_b}(A)} \over {\Delta {T_b}(B)}}$$, is :
Answer
(D)
1 : 5
9
The minimum amount of O2(g) consumed per gram of reactant is for the reaction :
(Given atomic mass : Fe = 56, O = 16, Mg = 24, P = 31, C = 12, H = 1)
Answer
(A)
4Fe(s) + 3O2(g) $$ \to $$ 2Fe2O3(s)
10
For the reaction,
2SO2(g) + O2(g) = 2SO3(g), $$\Delta $$H = –57.2 kJ mol–1 and KC = 1.7 × 1016
Which of the following statement is incorrect ?
Answer
(C)
The equilibrium constant is large suggestive of reaction going to completion and so no catalyst is required.
11
The correct order of the first ionization enthalpies is :
Answer
(D)
Ti < Mn < Ni < Zn
12
The ratio of the shortest wavelength of two spectral series of hydrogen spectrum is found to be about 9. The spectral series are :
Answer
(C)
Lyman and Paschen
13
Compound A(C9H10O) shows positive iodoform test. Oxidation of A with KMnO4/KOH given acid B(C8H6O4). Anhydride of B is used for the preparation of phenolphthalein. Compound A is:
Answer
(D)
14
The major product 'Y' in the following reactions is :
Answer
(C)
15
For the reaction of H2 with I2, the rate constant is 2.5 × 10–4 dm3 mol–1s–1 at 327°C and 1.0 dm3 mol–1 at 527°C. The activation energy for the reaction, in kJ mole–1 is : (R = 8.314 JK–1 mol–1 )
Answer
(B)
166
16
The INCORRECT statement is :
Answer
(B)
the gemstone, ruby, has Cr3+ ions occupying the octahedral sites of beryl.
17
In chromatography, which of the following statements is incorrect for Rf ?
Answer
(B)
Higher Rf value means higher adsorption.
18
Number of stereo centers present in linear and cyclic structures of glucose are respectively :
Answer
(B)
4 & 5
19
The highest possible oxidation states of uranium and plutonium, respectively are :
Answer
(D)
6 and 7
20
The noble gas that does not occur in the atmosphere is :
Answer
(D)
Ra
21
Which of the following is not a correct method of the preparation of benzylamine from cyanobenzene ?
Answer
(D)
(i) HCl/H2O                        (ii) NaBH4
22
The major product obtained in the given reaction is :
Answer
(C)