In which of the following reactions is hydrogen one of the products?
$i$. $2NaBH_4 + I_2 \longrightarrow$
$ii$. $2BF_3 + 6NaH \xrightarrow{450 \ K}$
$iii$. $4BF_3 + 3LiAlH_4 \longrightarrow$
$iv$. $3B_2H_6 + 6NH_3 \xrightarrow{\text{heat}} 2B_3N_3H_6 + 12H_2$
$i$. $2NaBH_4 + I_2 \longrightarrow$
$ii$. $2BF_3 + 6NaH \xrightarrow{450 \ K}$
$iii$. $4BF_3 + 3LiAlH_4 \longrightarrow$
$iv$. $3B_2H_6 + 6NH_3 \xrightarrow{\text{heat}} 2B_3N_3H_6 + 12H_2$
- A$ii, iii$
- B$i, ii$
- C$i, iv$
- D$iii, iv$
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In the structure of diborane $(B_2H_6)$,the number of $2$-centre-$2$-electron $(2c-2e)$ bonds is $X$ and the number of $3$-centre-$2$-electron $(3c-2e)$ bonds is $Y$. The value of $(X+Y)$ is:
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View SolutionMatch the List-$I$ with List-$II$.
List-$I$ (Element) List-$II$ (Application) $A$. $Cs$ $I$. High temperature thermometer $B$. $Ga$ $II$. Water repellent sprays $C$. $B$ $III$. Photoelectric cells $D$. $Si$ $IV$. Bullet proof vest
Choose the most appropriate answer from the options given below:
| List-$I$ (Element) | List-$II$ (Application) |
|---|---|
| $A$. $Cs$ | $I$. High temperature thermometer |
| $B$. $Ga$ | $II$. Water repellent sprays |
| $C$. $B$ | $III$. Photoelectric cells |
| $D$. $Si$ | $IV$. Bullet proof vest |
Choose the most appropriate answer from the options given below:
The element which exists in liquid state for a wide range of temperature and can be used for measuring high temperature is :-
Easy
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