Question

if one gram of metal carbonate gives 0.56 gram of its oxide on heating the equivalent weight of the metal will be​

Answer 1

Answer:

XCO3 on heating gives XO + CO2this implies X is 2+

x+60 g of metal gives x+16 g of its oxide

Also, according to question, 1 g of metal gives 0.56 g of its oxide

By solving, this 2 equations, we get x=40 g.

But, as X is dipositive, hence, its equivalent weight = 40/2 = 20

So, the correct option is (4). 20

Answer 2

Concept:

Here the concept of equivalent weight is used. The equivalent weight is defined as the gram atomic weight divided by its valency.

i.e. Equivalent weight = Gram atomic Weight/ Valency

Given:

We have one gram of metal carbonate that gives 0.56 gram of its oxide.

Find:

We have to find the equivalent weight of the metal.

Solution:

Let, metal carbonate =$MCO_{3}$

and metal oxide = MO

$MCO_{3}$    ----------> MO+ $CO_{2}$

As we know that one gram of metal carbonate gives us 0.56 gram of oxide . So if we have $CaCO_{3}$ having molecular weight of 100 gram so the molecular weight of CaO would be 56 gram.

That means molecular weight of Ca is 40.

Now, equivalent weight = gram atomic weight / valency

                                        = 40/2 = 20

Hence, the equivalent weight is 20.

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