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2
MCQ (Single Correct Answer)

Why does $\mathrm{H}^{+}$ion always get associated with other atoms or molecules?

A
Ionisation enthalpy of hydrogen resembles that of alkali metals
B
Its reactivity is similar to halogens
C
It resembles both alkali metals and halogens
D
Loss of an electron from hydrogen atom results in a nucleus of very small size as compared to other atoms or ions. Due to small size it cannot exist free
3
MCQ (Single Correct Answer)

Metal hydrides are ionic, covalent or molecular in nature. Among LiH, $\mathrm{NaH}, \mathrm{KH}, \mathrm{RbH}, \mathrm{CsH}$, the correct order of increasing ionic character is

A
$\mathrm{LiH}>\mathrm{NaH}>\mathrm{CsH}>\mathrm{KH}>\mathrm{RbH}$
B
$\mathrm{LiH}<\mathrm{NaH}<\mathrm{KH}<\mathrm{RbH}<\mathrm{CsH}$
C
$\mathrm{RbH}>\mathrm{CsH}>\mathrm{NaH}>\mathrm{KH}>\mathrm{LiH}$
D
$\mathrm{NaH}>\mathrm{CsH}>\mathrm{RbH}>\mathrm{LiH}>\mathrm{KH}$
4
MCQ (Single Correct Answer)

Which of the following hydrides is electron-precise hydride?

A
$\mathrm{B}_2 \mathrm{H}_6$
B
$\mathrm{NH}_3$
C
$\mathrm{H}_2 \mathrm{O}$
D
$\mathrm{CH}_4$
5
MCQ (Single Correct Answer)

Radioactive elements emit $\alpha, \beta$ and $\gamma$ rays and are characterised by their half-lives. The radioactive isotope of hydrogen is

A
protium
B
deuterium
C
tritium
D
hydronium
6
MCQ (Single Correct Answer)

Consider the reactions

(i) $\mathrm{H}_2 \mathrm{O}_2+2 \mathrm{HI} \longrightarrow \mathrm{I}_2+2 \mathrm{H}_2 \mathrm{O}$

(ii) $\mathrm{HOCl}+\mathrm{H}_2 \mathrm{O}_2 \longrightarrow \mathrm{H}_3 \mathrm{O}^{+}+\mathrm{Cl}^{-}+\mathrm{O}_2$

Which of the following statements is correct about $\mathrm{H}_2 \mathrm{O}_2$ with reference to these reactions? Hydrogen peroxide is ........... .

A
an oxidising agent in both (i) and (ii)
B
an oxidising agent in (i) and reducing agent in (ii)
C
a reducing agent in (i) and oxidising agent in (ii)
D
a reducing agent in both (i) and (ii)
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