1
JEE Main 2022 (Online) 29th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The reaction of zinc with excess of aqueous alkali, evolves hydrogen gas and gives :

A
$$\mathrm{Zn}(\mathrm{OH})_{2}$$
B
$$\mathrm{ZnO}$$
C
$$\left[\mathrm{Zn}(\mathrm{OH})_{4}\right]^{2-}$$
D
$$\left[\mathrm{ZnO}_{2}\right]^{2-}$$
2
JEE Main 2022 (Online) 29th July Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

In following pairs, the one in which both transition metal ions are colourless is :

A
$$\mathrm{Sc}^{3+}, \mathrm{Zn}^{2+}$$
B
$$\mathrm{Ti}^{4+}, \mathrm{Cu}^{2+}$$
C
$$\mathrm{V}^{2+}, \mathrm{Ti}^{3+}$$
D
$$\mathrm{Zn}^{2+}, \mathrm{Mn}^{2+}$$
3
JEE Main 2022 (Online) 28th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

Concentrated $$\mathrm{HNO}_{3}$$ reacts with Iodine to give

A
HI, $$\mathrm{NO}_{2}$$ and $$\mathrm{H}_{2} \mathrm{O}$$
B
$$\mathrm{HIO}_{2}, \mathrm{~N}_{2} \mathrm{O}$$ and $$\mathrm{H}_{2} \mathrm{O}$$
C
$$\mathrm{HIO}_{3}, \mathrm{NO}_{2}$$ and $$\mathrm{H}_{2} \mathrm{O}$$
D
$$\mathrm{HIO}_{4}, \mathrm{NO}_{2}$$ and $$\mathrm{H}_{2} \mathrm{O}$$
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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