1
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

For the redox reaction

$$\mathrm{MnO}_4^{-}+\mathrm{C}_2 \mathrm{O}_4^{2-}+\mathrm{H}^{+} \longrightarrow \mathrm{Mn}^{2+}+\mathrm{CO}_2+\mathrm{H}_2 \mathrm{O}$$,

the correct coefficients of the reactants for the balanced reaction are respectively

A
$$2,5,16$$
B
$$16,3,12$$
C
$$15,16,12$$
D
$$2,16,5$$
2
AP EAPCET 2021 - 19th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

Assertion (A) The colour of old lead paintings can be restored by washing them with a dilute solution of $$\mathrm{H}_2 \mathrm{O}_2$$.

Reason (R) Hydrogen peroxide reduces $$\mathrm{PbS}$$ to $$\mathrm{Pb}$$.

A
Both $$A$$ and $$R$$ are true and $$R$$ is a correct explanation for $$A$$.
B
Both $$A$$ and $$R$$ are true but $$R$$ is not a correct explanation for $$A$$.
C
$$A$$ is true but $$R$$ is false.
D
$$A$$ is false but $$R$$ is true.
3
AP EAPCET 2021 - 19th August Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which among the following species acts as a self-indicator?

A
H$$_2$$O$$_2$$
B
I$$^-$$
C
Cr$$_2$$O$$_7^{2 - }$$
D
MnO$$_4^{- }$$
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