JEE Main 2023 (Online) 25th January Morning Shift | p-Block Elements Question 29 | Chemistry

JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

-1

Reaction of thionyl chloride with white phosphorus forms a compound [A], which on hydrolysis gives [B], a dibasic acid. [A] and [B] are respectively

P$$_4$$O$$_6$$ and H$$_3$$PO$$_3$$

POCl$$_3$$ and H$$_3$$PO$$_4$$

PCl$$_5$$ and H$$_3$$PO$$_4$$

PCl$$_3$$ and H$$_3$$PO$$_3$$

JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

-1

Match the List-I with List-II :

	List-I Cations		List-II Group reagents
A.	$$\mathrm{Pb^{2+},Cu^{2+}}$$	i)	$$\mathrm{H_2S}$$ gas in presence of dilute HCl
B.	$$\mathrm{Al^{3+},Fe^{3+}}$$	ii)	$$\mathrm{(NH_4)_2CO_3}$$ in presence of $$\mathrm{NH_4OH}$$
C.	$$\mathrm{Co^{2+},Ni^{2+}}$$	iii)	$$\mathrm{NH_4OH}$$ in presence of $$\mathrm{NH_4Cl}$$
D.	$$\mathrm{Ba^{2+},Ca^{2+}}$$	iv)	H₂S in presence of NH₄OH

Correct match is -

A $$\to$$ i, B $$\to$$ iii, C $$\to$$ iv, D $$\to$$ ii

A $$\to$$ i, B $$\to$$ iii, C $$\to$$ ii, D $$\to$$ iv

A $$\to$$ iii, B $$\to$$ i, C $$\to$$ iv, D $$\to$$ ii

A $$\to$$ iv, B $$\to$$ ii, C $$\to$$ iii, D $$\to$$ i

JEE Main 2023 (Online) 25th January Morning Shift

MCQ (Single Correct Answer)

-1

Compound A reacts with NH$$_4$$Cl and forms a compound B. Compound B reacts with H$$_2$$O and excess of CO$$_2$$ to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A, B and C, are respectively.

$$\mathrm{Ca{(OH)_2},NH_4^ \oplus ,{(N{H_4})_2}C{O_3}}$$

$$\mathrm{CaC{l_2},NH_4^ \oplus ,{(N{H_4})_2}C{O_3}}$$

$$\mathrm{CaC{l_2},N{H_3},N{H_4}HC{O_3}}$$

$$\mathrm{Ca{(OH)_2},N{H_3},N{H_4}HC{O_3}}$$

JEE Main 2023 (Online) 24th January Evening Shift

MCQ (Single Correct Answer)

-1

$$\mathrm{K_2Cr_2O_7}$$ paper acidified with dilute $$\mathrm{H_2SO_4}$$ turns green when exposed to

Sulphur dioxide

Sulphur trioxide

Hydrogen sulphide

Carbon dioxide