1
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
5.1 g NH4SH is introduced in 3.0 L evacuated flask at 327ºC. 30% of the solid NH4SH decomposed to NH3 and H2S as gases . The Kp of the reaction at 327oC is (R = 0.082 L atm mol–1 K–1, Molar mass of S = 32 g mol–1 molar mass of N = 14 g mol–1)
A
0.242 $$ \times $$ 10$$-$$4 atm2
B
1 $$ \times $$ 10–4 atm2
C
4.9 $$ \times $$ 10$$-$$3 atm2
D
0.242 atm2
2
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
The correct match between item 'I' and item 'II' is :

Item 'I' (compound) Item 'II'
(reagent)
(A) Lysine (P) 1-naphthol
(B) Furfural (Q) ninhydrin
(C) Benzylalcohol (R) KMnO4
(D) Styrene (S) Ceric ammonium
nitrate
A
(A)  $$ \to $$  (Q);  (B)  $$ \to $$  (R);  (C)  $$ \to $$  (S);   (D)  $$ \to $$  (P)
B
(A)  $$ \to $$  (Q);  (B)  $$ \to $$  (P);  (C)  $$ \to $$  (S);   (D)  $$ \to $$  (R)
C
(A)  $$ \to $$  (R);  (B)  $$ \to $$  (P);  (C)  $$ \to $$  (Q);   (D)  $$ \to $$  (S)
D
(A)  $$ \to $$  (Q);  (B)  $$ \to $$  (P);  (C)  $$ \to $$  (R);   (D)  $$ \to $$  (S)
3
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
An ideal gas undergoes isothermal compression from 5m3 to 1 m3 against a constant external pressure of 4 Nm–2. Heat released in this process is used to increase the temperature of 1 mole of Al. If molar heat capacity of Al is 24 J mol–1 K–1, the temperature of Al increases by :
A
$${2 \over 3}K$$
B
$${3 \over 2}K$$
C
1 K
D
2 K
4
JEE Main 2019 (Online) 10th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
Elevation in the boiling point for 1 molar solution of glucose is 2 K. The depression in the freezing point for 2 molal solution of glucose in the same solvent is 2 K. The relation between Kb and Kf is
A
Kb = Kf
B
Kb = 0.5 Kf
C
Kb = 1.5 Kf
D
Kb = 2 Kf
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