1
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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

A
P$$_4$$O$$_6$$ and H$$_3$$PO$$_3$$
B
POCl$$_3$$ and H$$_3$$PO$$_4$$
C
PCl$$_5$$ and H$$_3$$PO$$_4$$
D
PCl$$_3$$ and H$$_3$$PO$$_3$$
2
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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
A $$\to$$ i, B $$\to$$ iii, C $$\to$$ iv, D $$\to$$ ii
B
A $$\to$$ i, B $$\to$$ iii, C $$\to$$ ii, D $$\to$$ iv
C
A $$\to$$ iii, B $$\to$$ i, C $$\to$$ iv, D $$\to$$ ii
D
A $$\to$$ iv, B $$\to$$ ii, C $$\to$$ iii, D $$\to$$ i
3
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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.

A
$$\mathrm{Ca{(OH)_2},NH_4^ \oplus ,{(N{H_4})_2}C{O_3}}$$
B
$$\mathrm{CaC{l_2},NH_4^ \oplus ,{(N{H_4})_2}C{O_3}}$$
C
$$\mathrm{CaC{l_2},N{H_3},N{H_4}HC{O_3}}$$
D
$$\mathrm{Ca{(OH)_2},N{H_3},N{H_4}HC{O_3}}$$
4
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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

A
Sulphur dioxide
B
Sulphur trioxide
C
Hydrogen sulphide
D
Carbon dioxide
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