1
KCET 2021
MCQ (Single Correct Answer)
+1
-0

Which of the following is not true for oxidation?

A
Addition of oxygen
B
Addition of electronegative element
C
Removal of hydrogen
D
Removal of electronegative element
2
KCET 2020
MCQ (Single Correct Answer)
+1
-0

How many moles of acidified $$\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$$ is required to liberate 6 moles of $$\mathrm{I}_2$$ from an aqueous solution of $$\mathrm{I}^{-}$$?

A
2
B
1
C
0.25
D
0.5
3
KCET 2020
MCQ (Single Correct Answer)
+1
-0

The oxidation number of nitrogen atoms in $$\mathrm{NH}_4 \mathrm{NO}_3$$ are

A
$$+5,+5$$
B
$$-3,+5$$
C
$$+3,-5$$
D
$$-3,-3$$
4
KCET 2020
MCQ (Single Correct Answer)
+1
-0

In which of the following cases a chemical reaction is possible?

A
$$\mathrm{ZnSO}_4(a q)$$ is placed in a copper vessel
B
$$\mathrm{AgNO}_3$$ solution is stirred with a copper spoon
C
Conc. $$\mathrm{HNO}_3$$ is stored in a platinum vessel
D
gold ornaments are washed with dil. $$\mathrm{HCl}$$
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