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JEE MAIN - Chemistry (2019 - 9th April Evening Slot)

1
Hinsberg's reagent is :
Answer
(B)
C6H5SO2Cl
2
Molal depression constant for a solvent is 4.0 kg mol–1. The depression in the freezing point of the solvent for 0.03 mol kg–1 solution of K2SO4 is :
(Assume complete dissociation of the electrolyte)
Answer
(C)
0.36 K
3
The maximum number of possible oxidation states of actinoides are shown by :
Answer
(C)
neptunium (Np) and plutonium (Pu)
4
The major product of the following reaction is:
Answer
(A)
JEE Main 2019 (Online) 9th April Evening Slot Chemistry - Aldehydes, Ketones and Carboxylic Acids Question 178 English Option 1
5
Which of the following potential energy (PE) diagrams represents the SN1 reaction?
Answer
(A)
6
In the following reaction Rate of the reaction is the highest for :
Answer
(C)
Propanal as substrate and methanol in excess
7
Consider the given plot of enthalpy of the following reaction between A and B.
A+ B $$ \to $$ C + D
Identify the incorrect statement.
Answer
(D)
Activation enthalpy to form C is 5kJ mol–1 less than that to form D.
8
A solution of Ni(NO3)2 is electrolysed between platinum electrodes using 0.1 Faraday electricity. How many mole of Ni will be deposited at the cathode?
Answer
(D)
0.05
9
What would be the molality of 20% (mass/ mass) aqueous solution of KI?
(molar mass of KI = 166 g mol–1)
Answer
(A)
1.51
10
The peptide that gives positive ceric ammonium nitrate and carbylamine tests is :
Answer
(A)
Ser-Lys
11
Among the following species, the diamagnetic molecule is
Answer
(A)
CO
12
The correct statements among I to III regarding group 13 element oxides are,
(I) Boron trioxide is acidic.
(II) Oxides of aluminium and gallium are amphoteric.
(III) Oxides of indium and thalliumare basic.
Answer
(B)
(I), (II) and (III)
13
The maximum possible denticities of a ligand given below towards a common transition and inner-transition metal ion, respectively, are :
Answer
(C)
6 and 8
14
Which one of the following about an electron occupying the 1s orbital in a hydrogen atom is incorrect ?

(The Bohr radius is represented by a0)
Answer
(C)
The total energy of the electron is maximum when it is at a distance a0 from the nucleus.
15
The major products A and B for the following reactions are, respectively:
Answer
(C)
16
During compression of a spring the work done is 10kJ and 2kJ escaped to the surroundings as heat. The change in internal energy, $$\Delta $$U(inkJ) is :
Answer
(B)
8
17
Increasing order of reactivity of the following compounds for SN1 substitution is:
Answer
(C)
(B) < (A) < (D) < (C)
18
HF has highest boiling point among hydrogen halides, because it has :
Answer
(B)
strongest hydrogen bonding
19
In an acid-base titration, 0.1 M HCl solution was added to the NaOH solution of unknown strength. Which of the following correctly shows the change of pH of the titraction mixture in this experiment?

Answer
(B)
(A)
20
p-Hydroxybenzophenone upon reaction with bromine in carbon tetrachloride gives:
Answer
(B)
21
The correct statements among I to III are :
(I) Valence bond theory cannot explain the color exhibited by transition metal complexes.
(II) Valence bond theory can predict quantitatively the magnetic properties of transtition metal complexes.
(III) Valence bond theory cannot distinguish ligands as weak and strong field ones.
Answer
(D)
(I) and (III) only