Question

One gram of hydrogen is found to combine with 80 g of bromine. One gram of calcium (valency = 2) combines with 4 g of bromine. The equivalent weight of calcium is :

• A. 10
• B. 20
• C. 40
• D. 80

Answer 1

Answer: (B)

20

When as per given the ratioof $Ca$ and $Br$ combined is $1:4$ by mass

So according to this
$Ca+B{r}_2\to CaB{r}_2$
$20g$ $80g$

Note: $20/80=1/4,$
20 g is the half molar wt of $Ca$ and 80 g is molar wt. of $Br$.

Now as valency of $Ca$ is 2.
So equivalent weight of $Ca$ = 40 /2 = 20 .

(option B)