JEE MAIN - Chemistry (2020 - 8th January Morning Slot)
1
The third ionization enthalpy is minimum for :
Answer
(D)
Fe
2
A graph of vapour pressure and temperature for three different liquids X, Y, and Z is shown below :
The following inferences are made :
(A) X has higher intermolecular interactions compared to Y.
(B) X has lower intermolecular interactions compared to Y.
(C) Z has lower intermolecular interactions compared to Y.
The correct inference (s) is / are :
Answer
(A)
(B)
3
Arrange the following compounds in increasing order of C–OH bond length : methanol, phenol,
p-ethoxyphenol
Answer
(D)
phenol < p-ethoxyphenol < methanol
4
The complex that can show fac- and mer-isomers is :
Answer
(C)
[Co(NH3)3(NO2)3]
5
The major products A and B in the following reactions are :
Answer
(C)
6
For the Balmer series in the spectrum of H atom,
$$\overline \nu = {R_H}\left\{ {{1 \over {n_1^2}} - {1 \over {n_2^2}}} \right\}$$, the correct statements among (I) to (IV)
are :
(I) As wavelength decreases, the lines in the series converge
(II) The integer n1 is equal to 2
(III) The lines of longest wavelength corresponds to n2 = 3
(IV) The ionization energy of hydrogen can be calculated from wave number of these lines
Answer
(B)
(I), (II), (III)
7
The magnitude of work done by a gas that undergoes a reversible expansion along the path ABC shown in
the figure is _______.
Answer
48
8
Ferrous sulphate heptahydrate is used to fortify foods with iron. The amount (in grams) of the salt required to
achieve 10 ppm of iron in 100 kg of wheat is _______.
Atomic weight : Fe = 55.85; S = 32.00;
O = 16.00
Answer
4.95to4.97
9
What would be the electrode potential for the given half cell reaction at pH = 5?
______.
The volume (in mL) of 0.125 M AgNO3 required to quantitatively precipitate chloride ions in 0.3 g of
[Co(NH3)6]Cl3 is ________.
M[Co(NH3)6Cl3] = 267.46 g/mol
MAgNO3 = 169.87 g/mol
Answer
26.80to27.00
11
The decreasing order of reactivity towards dehydrohalogenation (E1) reaction of the following compounds is :
Answer
(B)
D $$>$$ B $$>$$ C $$>$$ A
12
The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are :
Answer
(B)
496, 737, 577, 786
13
Which of the following statement is not true for glucose?
Answer
(A)
Glucose gives Schiff's test for aldehyde
14
The rate of a certain biochemical reaction at physiological temperature (T) occurs 106 times faster with
enzyme than without. The change in the activation energy upon adding enzyme is :
Answer
(B)
– 6 (2.303)RT
15
The strength of an aqueous NaOH solution is most accurately determined by titrating : (Note : consider that
an appropriate indicator is used)
Answer
(B)
Aq. NaOH in a burette and aqueous oxalic acid in a conical flask
16
The major product of the following reaction is :
Answer
(B)
17
The major product of the following reaction is :
Answer
(B)
18
The stoichiometry and solubility product of a salt with the solubility curve given below is, respectively :
Answer
(C)
XY2, 4 × 10–9 M3
19
A flask contains a mixture of isohexane and 3-methylpentane. One of the liquids boils at 63oC while the
other boils at 60oC What is the best way to separate the two liquids and which one will be distilled out first ?
Answer
(C)
fractional distillation, isohexane
20
The predominant intermolecular forces present in ethyl acetate, a liquid, are:
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The following inferences are made :
_8th_January_Morning_Slot_en_5_1.png)
_8th_January_Morning_Slot_en_5_4.png)
_8th_January_Morning_Slot_en_7_1.png)
_8th_January_Morning_Slot_en_11_1.png)
_8th_January_Morning_Slot_en_16_1.png)
_8th_January_Morning_Slot_en_16_3.png)
_8th_January_Morning_Slot_en_17_1.png)
_8th_January_Morning_Slot_en_17_3.png)
_8th_January_Morning_Slot_en_18_1.png)
