Which among the following is non-poisonous in nature?

The following statements concern elements in the periodic table. Which of the following is true?

Which of the following elements forms a strongly acidic oxide?

$A + H_2O \to B + HCl$
$B + H_2O \to C + HCl$
Compound $(A), (B)$ and $(C)$ will be respectively

The maximum number of $P-H$ bonds is present in a molecule of:

In the nitrogen family,the $H-M-H$ bond angle in the hydrides $MH_3$ gradually becomes closer to $90^o$ on going from $N$ to $Sb$. This shows that gradually