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JEE MAIN - Chemistry (2019 - 12th April Morning Slot)

1
An example of a disproportionation reaction is :
Answer
(C)
2CuBr $$ \to $$ CuBr2 + Cu
2
Given

CO3+ + e– $$ \to $$ CO2+ ; Eo = + 1.81 V

Pb4+ + 2e– $$ \to $$ Pb2+ ; Eo = + 1.67 V

Ce4+ + e– $$ \to $$ Ce3+ ; Eo = + 1.61 V

Bi3+ + 3e– $$ \to $$ Bi ; Eo = + 0.20 V

Oxidizing power of the species will increase in the order :
Answer
(D)
Bi3+ < Ce4+ < Pb4+ < Co3+
3
The correct statement among the following is :
Answer
(D)
(SiH3)3N is planar and less basic than (CH3)3N
4
5 moles of AB2 weigh 125 × 10–3 kg and 10 moles of A2B2 weigh 300 × 10–3 kg. The molar mass of A (MA) and molar mass of B (MB) in kg mol are:
Answer
(C)
MA = 5 × 10–3 and MB = 10 × 10–3
5
Complete removal of both the axial ligands (along the z-axis) from an octahedral complex leads to which of the following splitting patterns? (relative orbital energies not on scale).
Answer
(A)
6
The increasing order of the pKb of the following compound is :
Answer
(C)
(B) < (D) < (A) < (C)
7
The group number, number of valence electrons, and valency of an element with atomic number 15, respectively, are:
Answer
(D)
15, 5 and 3
8
The complex ion that will lose its crystal field stabilization energy upon oxidation of its metal to +3 state is :
Answer
(A)
[Fe(phen)3]2+
9
The major product(s) obtained in the following reaction is/are :
Answer
(A)
10
In the following reaction; xA $$ \to $$ yB
$${\log _{10}}\left[ { - {{d\left[ A \right]} \over {dt}}} \right] = {\log _{10}}\left[ {{{d\left[ B \right]} \over {dt}}} \right] + 0.3010$$
'A' and 'B' respectively can be :
Answer
(B)
C2H4 and C4H8
11
The major product of the following addition reaction is :
H3C–CH=CH2 $$\buildrel {C{l_2}/{H_2}O} \over \longrightarrow $$
Answer
(B)
12
An ideal gas is allowed to expand form 1 L to 10 L against a constant external pressure of I bar. The work done in kJ is :
Answer
(B)
–0.9
13
But-2-ene on reaction with alkaline KMnO4 at elevated temperature followed by acidification will give :
Answer
(B)
2 molecules of CH3COOH
14
The mole fraction of a solvent in aqueous solution of a solute is 0.8. The molality (in mol kg–1 ) of the aqueous solution is :
Answer
(C)
13.88
15
The electrons are more likely to be found :
Answer
(B)
in the region a arid c
16
An organic compound 'A' is oxidizod with Na2O2 followed by boiling with HNO3. The resultant solution is then treated with ammonium molybdate to yield a yellow precipitate.
Based on above observation, the element present in the given compound is:
Answer
(B)
Phosphorus
17
Enthalpy of sublimation of iodine is 24 cal g–1 at 200 oC. If specific heat of I2(s) and l2 (vap) are 0.055 and 0.031 cal g–1K –1 respectively, then enthalpy of sublimation of iodine at 250 oC in cal g–1 is :
Answer
(B)
22.8
18
Which of the following statements is not true about RNA?
Answer
(D)
It has always double stranded $$\alpha $$-helix structure
19
The major products of the following reaction are :
Answer
(D)
20
What is the molar solubility of Al(OH)3 in 0.2 M NaOH solution ? Given that, solubility product of Al(OH)3 = 2.4 × 10–24 :
Answer
(A)
3 × 10–22
21
Glucose and Galactose are having identical configuration in all the positions except position
Answer
(D)
C–4
22
The major product of the following reaction is :
Answer
(B)