Question

30g of magnesium and 30g of oxygen are reacted, then
residual mixture contains
(a) 60g of Magnesium oxide only
(b) 40g of Magnesium oxide and 20 g of oxygen
(c) 45 g of Magnesium oxide and 15g of oxygen
(d) 50 g of Magnesium oxide and 10g of oxygen​

Answer 1

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When we react 30 gram of magnesium with 30 gram of oxygen then the residual mixture will contain 60 grams of magnesium oxide.

According to the law of conservation of mass, in a chemical reaction mass is neither created nor destroyed that is mass of reactance is equal to the mass of products.

The reacⁿ would be ,

$\boxed{\purple{\bf{\leadsto \underset{\red{Magnesium}}{2Mg}\:+\:\underset{\red{Oxygen}}{O_2}\:\longrightarrow\:\underset{\red{Magnesium\:Oxide}}{2MgO}}}}$

Here it is given that 30 gram of magnesium and 30 gram of oxygen react with each other so by the law of conservation of mass we can say that the mass of magnesium oxide would be (30+30)g = 60g .

Also note that magnesium ribbon burns with a dazzling white flame. when we mix water in it it becomes Magnesium hydroxide .

$\boxed{\purple{\bf{\leadsto \underset{\red{Magnesium\:Oxide}}{MgO}\:+\:\underset{\red{Water}}{H_2O}\:\longrightarrow\:\underset{\red{Magnesium\: hydroxide}}{Mg(OH)_2}}}}$

To check whether it is acidic or basic when we put red litmus and it turns red litmus to blue indicating its basic behaviour.