Question

3 g of a metal on reaction with oxygen form 5 g of
metal oxide. The equivalent weight of the metal is
(1) 4
(2) 6
(3) 10
(4) 12​

Answer 1

Answer:

option 4). ...12

Explanation:

3g of metal attach with 2g of oxygen

so 24gof metal attach with 16g of oxygen atom i.e. one mole of oxygen atom

and.metal oxide is being formed

so

o.s. is +2 and molar mass should be 24 and equivalent mass be 24/2= 12

Answer 2

The equivalent weight of metal is 12 hence option (4) is correct.

3g of a metal on reaction with oxygen form 5g of metal oxide.

We have to find the equivalent weight of the metal.

Concept : what is equivalent weight ?

• Like, atomic weight , molecular weight, It is also a type of weight. but it is unit less quantity.
• equivalent weight of a substance is a number which indicates how many parts of it combine with 8 parts of oxygen, 35.5 parts of chlorine or, 1 part of hydrogen.

For metal oxide,

      equivalent weight of metal/equivalent weight of oxygen = mass of metal/mass of oxygen.

Here, mass of metal = 3g

mass of metal oxide = 5g

∴ mass of oxygen = mass of metal oxide - mass of metal = 5g - 3g = 2g

equivalent weight of oxygen = 8

Now, equivalent weight of metal/8 = 3g/2g

⇒ equivalent weight of metal = 12

Therefore the equivalent weight of metal is 12.

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