1
KCET 2023
MCQ (Single Correct Answer)
+1
-0

The reducing agent in the given equations

$$4 \mathrm{Ag}(s)+8 \mathrm{CN}^{-}(a q)+2 \mathrm{H}_2 \mathrm{O}(a q)+\mathrm{O}_2(g) \longrightarrow 4\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}(a q)+4 \mathrm{OH}^{-}(a q)$$

$$2\left[\mathrm{Ag}(\mathrm{CN})_2\right]^{-}(a q)+\mathrm{Zn}(s) \longrightarrow {\left[\mathrm{Zn}(\mathrm{CN})_4\right]^{2-}(a q)+2 \mathrm{Ag}(s)}$$

A
$$\mathrm{Zn}$$
B
$$\mathrm{O}_2$$
C
$$\mathrm{H}_2 \mathrm{O}$$
D
$$\mathrm{CN}^{-}$$
2
KCET 2023
MCQ (Single Correct Answer)
+1
-0

$$a \mathrm{MnO}_4^{-}+b \mathrm{~S}_2 \mathrm{O}_3^{2-}+\mathrm{H}_2 \mathrm{O} \longrightarrow x \mathrm{MnO}_2 +y \mathrm{SO}_4^{2-}+z \mathrm{OH}^{-}$$

$$a$$ and $$y$$ respectively are

A
8 ; 3
B
8 ; 6
C
3 ; 6
D
8 ; 8
3
KCET 2022
MCQ (Single Correct Answer)
+1
-0

In which of the following compounds, an element exhibits two different oxidation states?

A
$$\mathrm{NH}_4 \mathrm{NO}_3$$
B
$$\mathrm{N}_2 \mathrm{H}_4$$
C
$$\mathrm{N}_3 \mathrm{H}$$
D
$$\mathrm{NH}_2 \mathrm{CONH}_2$$
4
KCET 2022
MCQ (Single Correct Answer)
+1
-0

All Cu(II) halides are known, except the iodide, the reason for it is that

A
$$\mathrm{Cu}^{2+}$$ oxidises iodide to iodine
B
$$\mathrm{Cu}^{2+}$$ has much more negative hydration enthalpy
C
$$\mathrm{Cu}^{2+}$$ ion has smaller size.
D
iodide is bulky ion.
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