JEE MAIN - Chemistry (2019 - 10th January Morning Slot)
1
The major product of the following reaction is :
Answer
(A)
2
The total number of isomers for a square planar complex [M(F)(Cl)(SCN)(NO2)] is
Answer
(C)
12
3
The decreasing order of ease of alkaline hydrolysis for the following esters in
Answer
(C)
III > II > I > IV
4
The correct structure of product 'P' in the following reactions is :
Answer
(B)
5
The major product 'X' formed in the following reaction is :
Answer
(C)
6
The major product of the following reaction is
Answer
(A)
7
Which dicarboxylic acid in presence of a dehydrating agent is least reactive to give an anhydride?
Answer
(A)
8
Consider the given plots for a reaction obeying Arrhenius equation (0oC < T < 300oC) : (K and Ea are rate constant and activation energy, respectively)
Choose the correct option :
Answer
(B)
Both I and II are correct
9
Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface ?
Answer
(B)
10
The increasing order of the pKa values of the following compounds is :
Answer
(B)
B < C < A < D
11
Which hydrogen in compound (E) is easily replaceable during bromination reaction in presence of light ?
Answer
(C)
$$\gamma $$ $$-$$ hydrogen
12
The type of hybridisation and number of lone pair (s) of electrons of Xe in XeOF4, respectively, are:
Answer
(D)
sp3d2 and 1
13
Consider the following reduction processes :
Zn2+ + 2e– $$ \to $$ Zn(s) ; Eo = – 0.76 V
Ca2+ + 2e– $$ \to $$ Ca(s); Eo = –2.87 V
Mg2+ + 2e– $$ \to $$ Mg(s) ; Eo = – 2.36 V
Ni2 + 2e– $$ \to $$ Ni(s) ; Eo = – 0.25
The reducing power of the metals increases in the order :
Answer
(B)
Ni < Zn < Mg < Ca
14
The major product formed in the reaction given below will be :
Answer
(C)
15
Liquids A and B form an ideal solution in the entire composition range. At 350 K, the vaapor pressures of pure A and pure B are 7 $$ \times $$ 103 Pa and 12 $$ \times $$ 103 Pa, respectively . The composition of the vapor in equilibriumwith a solution containing 40 mole percent of A at this temperature is :
Answer
(B)
xA = 0.28; xB = 0.72
16
The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :
Answer
(C)
decrease in both atomic and ionic radii
17
Two pi and half sigma bonds are present in :
Answer
(B)
N$$_2^ + $$
18
Wilkinson catalyst is : (Et = C2H5)
Answer
(A)
[(Ph3P)3 RhCl]
19
If dichloromethane (DCM) and water (H2O) are used for differential extraction, which one of the following statements is correct ?
Answer
(C)
DCM and H2O would stay as lower and upper layer respectively in the separating funnel(S.F).
20
The values of Kp/Kc for the following reactions at 300 K are, respectively : (At 300 K, RT = 24.62 dm3 atm mol–1)
The electronegativity of aluminium is similar to :
Answer
(A)
Beryllium
22
A mixture of 100 m mol of Ca(OH)2 and 2 g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The mass of calcium sulphate formed and the concentration of OH– in resulting solution, respectively, are : (Molar mass of Ca (OH)2, Na2SO4 and CaSO4 are 74, 143 and 136 g mol–1
, respectively; Ksp of Ca(OH)2 is 5.5 × 10–6
)
Answer
(C)
1.9g, 0.28 mol L$$-$$1
23
A process has $$\Delta $$H = 200 J mol–1 and $$\Delta $$S = 40 JK–1 mol–1. Out of the values given below, choose the minimum temperature above which the process will be spontaneous :
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