WB JEE 2021 | Some s Block Elements Question 6 | Chemistry

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

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.

(X)	(Y)	(Z)
$${N_2}$$	$${(N{H_4})_2}C{O_3}$$	$$N{H_4}Cl$$

(X)	(Y)	(Z)
$${O_2}$$	$$NaN{H_4}C{O_3}$$	$$NaHC{O_3}$$

(X)	(Y)	(Z)
$$C{O_2}$$	$$N{H_4}HC{O_3}$$	$${(N{H_4})_2}C{O_3}$$

(X)	(Y)	(Z)
$$C{O_2}$$	$$NaHC{O_3}$$	$$N{a_2}C{O_3}$$

WB JEE 2020

MCQ (Single Correct Answer)

-0.25

In the extraction of Ca by electro reduction of molten CaCl₂ some CaF₂ is added to the electrolyte for the following reason :

To keep the electrolyte in liquid state at temperature lower than the m.p. of CaCl₂

To effect precipitation of Ca

To effect the electrolysis at lower voltage

To increase the current efficiency

WB JEE 2019

MCQ (Single Correct Answer)

-0.33

The compound, which evolves carbon dioxide on treatment with aqueous solution of sodium bicarbonate at 25$$^\circ$$C, is

C₆H₅OH

CH₃COCl

CH₃CONH₂

CH₃COOC₂H₅

WB JEE 2019

MCQ (Single Correct Answer)

-0.33

The reactive species in chlorine bleach is

Cl₂O

OCl^$$-$$

ClO₂

HCl

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