1
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
Indicate the products (X) and (Y) in the following reactions

Na2S + nS(n = 1 $$-$$ 8) $$\to$$ (X)

Na2SO3 + S $$\to$$ (Y)
A
(X) (Y)
$$N{a_2}{S_2}{O_3}$$ $$N{a_2}{S_2}$$
B
(X) (Y)
$$N{a_2}{S_{(n + 1)}}$$ $$N{a_2}{S_2}{O_3}$$
C
(X) (Y)
$$N{a_2}{S_n}$$ $$N{a_2}{S_2}{O_3}$$
D
(X) (Y)
$$N{a_2}{S_5}$$ $$N{a_2}{S_2}{O_4}$$
2
WB JEE 2021
MCQ (Single Correct Answer)
+1
-0.25
Change Language
The white precipitate (Y), obtained on passing colorless and odourless gas (X) through an ammoniacal solution of NaCl, losses about 37% of its weight on heating and a white residue (Z) of basic nature is left. Identify (X), (Y) and (Z) from following sets.
A
(X) (Y) (Z)
$${N_2}$$ $${(N{H_4})_2}C{O_3}$$ $$N{H_4}Cl$$
B
(X) (Y) (Z)
$${O_2}$$ $$NaN{H_4}C{O_3}$$ $$NaHC{O_3}$$
C
(X) (Y) (Z)
$$C{O_2}$$ $$N{H_4}HC{O_3}$$ $${(N{H_4})_2}C{O_3}$$
D
(X) (Y) (Z)
$$C{O_2}$$ $$NaHC{O_3}$$ $$N{a_2}C{O_3}$$
3
WB JEE 2020
MCQ (Single Correct Answer)
+1
-0.25
Change Language
In the extraction of Ca by electro reduction of molten CaCl2 some CaF2 is added to the electrolyte for the following reason :
A
To keep the electrolyte in liquid state at temperature lower than the m.p. of CaCl2
B
To effect precipitation of Ca
C
To effect the electrolysis at lower voltage
D
To increase the current efficiency
4
WB JEE 2019
MCQ (Single Correct Answer)
+1
-0.33
Change Language
The compound, which evolves carbon dioxide on treatment with aqueous solution of sodium bicarbonate at 25$$^\circ$$C, is
A
C6H5OH
B
CH3COCl
C
CH3CONH2
D
CH3COOC2H5
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