WB JEE 2023 | Some s Block Elements Question 1 | Chemistry

WB JEE 2023

MCQ (Single Correct Answer)

-0.25

Na$$_2$$CO$$_3$$ is prepared by Solvay process but K$$_2$$CO$$_3$$ cannot be prepared by the same because

K$$_2$$CO$$_3$$ is highly soluble in H$$_2$$O

KHCO$$_3$$ is sparingly soluble

KHCO$$_3$$ is appreciably soluble

KHCO$$_3$$ decomposes

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

A sample of MgCO₃ is dissolved in dil. HCl and the solution is neutralized with ammonia and buffered with NH₄Cl / NH₄OH. Disodium hydrogen phosphate reagent is added to the resulting solution. A white precipitate is formed. What is the formula of the precipitate?

Mg₃(PO₄)₂

Mg(NH₄)PO₄

MgHPO₄

Mg₂P₂O₇

WB JEE 2022

MCQ (Single Correct Answer)

-0.25

To a solution of colourless sodium salt, a solution of lead nitrate was added to have a white precipitate which dissolves in warm water and reprecipitates on cooling. Which of the following acid radical is present in the salt?

Cl^$$-$$

SO$$_4^{2 - }$$

S^2$$-$$

NO$$_3^{ - }$$

WB JEE 2021

MCQ (Single Correct Answer)

-0.25

Indicate the products (X) and (Y) in the following reactions

Na₂S + nS(n = 1 $$-$$ 8) $$\to$$ (X)

Na₂SO₃ + S $$\to$$ (Y)

(X)	(Y)
$$N{a_2}{S_2}{O_3}$$	$$N{a_2}{S_2}$$

(X)	(Y)
$$N{a_2}{S_{(n + 1)}}$$	$$N{a_2}{S_2}{O_3}$$

(X)	(Y)
$$N{a_2}{S_n}$$	$$N{a_2}{S_2}{O_3}$$

(X)	(Y)
$$N{a_2}{S_5}$$	$$N{a_2}{S_2}{O_4}$$

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