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1
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
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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
$$\mathrm{Ca{(OH)_2},N{H_3},N{H_4}HC{O_3}}$$
2
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
3
JEE Main 2023 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following is true about freons?

A
These are radicals of chlorine and chlorine monoxide
B
These are chemicals causing skin cancer
C
All radicals are called freons
D
These are chlorofluorocarbon compounds
4
JEE Main 2023 (Online) 24th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the Phosphorus oxoacid can create silver mirror from $$\mathrm{AgNO_3}$$ solution?

A
$$\mathrm{H_4P_2O_5}$$
B
$$\mathrm{H_4P_2O_7}$$
C
$$\mathrm{(HPO_3)_n}$$
D
$$\mathrm{H_4P_2O_6}$$
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