JEE MAIN - Chemistry (2020 - 2nd September Morning Slot)
1
The internal energy change (in J) When 90 g of
water undergoes complete evaporation at
100oC is ____________.
(Given : $$\Delta $$Hvap for water at 373 K = 41 kJ/mol,
R = 8.314 JK–1 mol–1)
Answer
189494TO189495
2
The oxidation states of iron atoms in
compounds (A), (B) and (C), respectively, are x,
y and z. The sum of x, y and z is ________.
Na4[Fe(CN)5(NOS)]
(A)
Na4[FeO4]
(B)
[Fe2(CO)9]
(C)
Answer
6
3
The number of chiral carbons present in the
molecule given below is _____ .
Answer
5
4
The Gibbs change (in J) for the given reaction at
[Cu2+] = [Sn2+] = 1 M and 298K is :
Cu(s) + Sn2+(aq.) $$ \to $$ Cu2+(aq.) + Sn(s);
($$E_{S{n^{2 + }}|Sn}^0 = - 0.16\,V$$,
$$E_{C{u^{2 + }}|Cu}^0 = 0.34\,V$$)
Take F = 96500 C mol–1)
Answer
96500
5
The increasing order of the following
compounds towards HCN addition is :
Answer
(C)
(iii) < (i) < (iv) < (ii)
6
The major aromatic product C in the following
reaction sequence will be :
Answer
(B)
7
In general the property (magnitudes only) that
show an opposite trend in comparison to other
properties across a period is
Answer
(D)
Atomic radius
8
While titrating dilute HCl solution with aqueous
NaOH, which of the following will not be
required?
Answer
(D)
Bunsen burner and measuring cylinder
9
The IUPAC name for the following compound
is
Answer
(D)
2, 5-dimethyl-6-oxo-hex-3-enoic acid
10
For the following Assertion and Reason, the
correct option is
Assertion (A): When Cu (II) and sulphide ions
are mixed, they react together
extremely quickly to give a
solid.
Reason (R): The equilibrium constant of
Cu2+(aq) + S2–(aq) ⇌ CuS(s) is
high because the solubility
product is low.
Answer
(C)
Both (A) and (R) are true and (R) is the
explanation for (A).
11
Which of the following compunds will show
retention in configuration on nucleophilic
substitution by OH– ion?
Answer
(C)
12
Consider that a d6 metal ion (M2+) forms a
complex with aqua ligands, and the spin only
magnetic moment of the complex is 4.90 BM.
The geometry and the crystal field stabilization
energy of the complex is
Answer
(C)
tetrahedral and –0.6 $$\Delta $$t
13
For octahedral Mn(II) and tetrahedral Ni(II)
complexes, consider the following statements:
(I) both the complexes can be high spin.
(II) Ni(II) complex can very rarely be low spin.
(III) with strong field ligands, Mn(II) complexes
can be low spin.
(IV)aqueous solution of Mn(II) ions is yellow in
colour.
The correct statements are :
Answer
(D)
(I), (II) and (III) only
14
An open beaker of water in equilibrium with
water vapour is in a sealed container. When a
few grams of glucose are added to the beaker
of water, the rate at which water molecules :
Answer
(D)
leaves the solution decreases
15
Consider the following rections:
'x', 'y' and 'z' in these reactions are respectively.
Answer
(C)
4, 6 & 5
16
The figure that is not a direct manifestation of
the quantum nature of atoms is :
Answer
(A)
17
If AB4 molecule is a polar molecule, a possible
geometry of AB4 is
Answer
(B)
see-saw
18
The major product in the following reaction is :
Answer
(C)
19
In Carius method of estimation of halogen,
0.172 g of an organic compound showed
presence of 0.08 g of bromine. Which of these
is the correct structure of the compound?
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