In which of the following reactions,$H_2$ is liberated?
$i$. $Al_{(s)} + HCl_{(aq)} \rightarrow$
$ii$. $Al_{(s)} + NaOH_{(aq)} \rightarrow$
$iii$. $B_2H_{6(g)} + H_2O_{(l)} \rightarrow$
$iv$. $F_{2(g)} + H_2O_{(l)} \rightarrow$
$i$. $Al_{(s)} + HCl_{(aq)} \rightarrow$
$ii$. $Al_{(s)} + NaOH_{(aq)} \rightarrow$
$iii$. $B_2H_{6(g)} + H_2O_{(l)} \rightarrow$
$iv$. $F_{2(g)} + H_2O_{(l)} \rightarrow$
- A$i, ii, iii, iv$
- B$i, ii, iv$
- C$i, ii, iii$
- D$ii, iii, iv$
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Sodium oxalate on heating with conc. $H_2SO_4$ gives
Medium
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Column-$I$ Column-$II$ $(i)$ Hydrogen peroxide $(a)$ Used as air purifier in submarines $(ii)$ Calcium sulphate hemihydrate $(b)$ Used for water softening $(iii)$ Potassium superoxide $(c)$ Antiseptic $(iv)$ Calgon $(d)$ Plaster of Paris
| Column-$I$ | Column-$II$ |
|---|---|
| $(i)$ Hydrogen peroxide | $(a)$ Used as air purifier in submarines |
| $(ii)$ Calcium sulphate hemihydrate | $(b)$ Used for water softening |
| $(iii)$ Potassium superoxide | $(c)$ Antiseptic |
| $(iv)$ Calgon | $(d)$ Plaster of Paris |
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| Column $I$ | Column $II$ |
| $A$. Synthesis gas | $1$. $Na_2[Na_4(PO_3)_6]$ |
| $B$. Dihydrogen | $2$. Oxidising agent |
| $C$. Heavy water | $3$. Softening of water |
| $D$. Calgon | $4$. Reducing agent |
| $E$. Hydrogen peroxide | $5$. Stoichiometric compounds of $s-$block elements |
| $F$. Salt like hydrides | $6$. Prolonged electrolysis of water |
| $7$. $Zn + NaOH$ | |
| $8$. $Zn + dil. H_2SO_4$ | |
| $9$. Synthesis of methanol | |
| $10$. Mixture of $CO$ and $H_2$ |
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View SolutionMatch the items in Column-$I$ with the relevant item in Column-$II$.
Column-$I$ Column-$II$ $A$. Hydrogen peroxide is used as a $1$. zeolite $B$. Used in Calgon method $2$. perhydrol $C$. Permanent hardness of hard water is removed by $3$. sodium hexametaphosphate $4$. propellant
| Column-$I$ | Column-$II$ |
| $A$. Hydrogen peroxide is used as a | $1$. zeolite |
| $B$. Used in Calgon method | $2$. perhydrol |
| $C$. Permanent hardness of hard water is removed by | $3$. sodium hexametaphosphate |
| $4$. propellant |
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