1
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

The metal salts formed during softening of hardwater using Clark's method are :

A
$$\mathrm{Ca}(\mathrm{OH})_{2}$$ and $$\mathrm{Mg}(\mathrm{OH})_{2}$$
B
$$\mathrm{CaCO}_{3}$$ and $$\mathrm{Mg}(\mathrm{OH})_{2}$$
C
$$\mathrm{Ca}(\mathrm{OH})_{2}$$ and $$\mathrm{MgCO}_{3}$$
D
$$\mathrm{CaCO}_{3}$$ and $$\mathrm{MgCO}_{3}$$
2
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Which of the following statement is incorrect?

A
Low solubility of LiF in water is due to its small hydration enthalpy.
B
$$\mathrm{KO}_{2}$$ is paramagnetic.
C
Solution of sodium in liquid ammonia is conducting in nature.
D
Sodium metal has higher density than potassium metal.
3
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Match List - I with List - II, match the gas evolved during each reaction.

List - I List - II
(A) $$\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \stackrel{\Delta}{\longrightarrow}$$ (I) $$\mathrm{H}_{2}$$
(B) $$\mathrm{KMnO}_{4}+\mathrm{HCl} \rightarrow$$ (II) $$\mathrm{N}_{2}$$
(C) $$\mathrm{Al}+\mathrm{NaOH}+\mathrm{H}_{2} \mathrm{O} \rightarrow$$ (III) $$\mathrm{O}_{2}$$
(D) $$\mathrm{NaNO}_{3} \stackrel{\Delta}{\longrightarrow}$$ (IV) $$\mathrm{Cl}_{2}$$

Choose the correct answer from the options given below :

A
$$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{III}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{IV})$$
B
$$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{I}),(\mathrm{C})-(\mathrm{IV}),(\mathrm{D})-(\mathrm{II})$$
C
$$(\mathrm{A})-(\mathrm{II}),(\mathrm{B})-(\mathrm{IV}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{III})$$
D
$$(\mathrm{A})-(\mathrm{III}),(\mathrm{B})-(\mathrm{IV}),(\mathrm{C})-(\mathrm{I}),(\mathrm{D})-(\mathrm{II})$$
4
JEE Main 2022 (Online) 28th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Which of the following has least tendency to liberate $$\mathrm{H}_{2}$$ from mineral acids?

A
Cu
B
Mn
C
Ni
D
Zn
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