MCQ
In a reaction $2A + B \to {A_2}B$, the reactant $ A $ will disappear at
- AHalf the rate that $B$ will decrease
- BThe same rate that $ B$ will decrease
- ✓Twice the rate that $B$ will decrease
- DThe same rate that ${A_2}B$ will form
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$(I)$ $B + ANO_3 \to B NO_3 + A$
$(II)$ $A + HCl \to ACl + \frac{1}{2}{H_2}$
$(III)$ $D + ECl \to DCl + E$
$(IV)$ $D + HNO_3 \to H_2$ gas is not evolved

$(I)$ Number of $S-S$ bonds in $H_2S_nO_6$ are $(n + 1)$
$(II)$ When $F_2$ reacts with water gives $HF, O_2$ and $O_3$
$(III)$ $LiNO_3$ and $BaCl_2$ compounds are used in fire works
$(IV)$ $Be$ and $Mg$ hydrides are ionic and polymeric