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Which of the following equation does not...

Which of the following equation does not obey the law of conservation of mass?

A

(a)`4H+O_(2) rarr 2H_(2)O`

B

(b)`H_(2)+O rarr 2H_(2)O`

C

(c )`2H+O_(2) rarr 2H_(2)O`

D

(d)`Both (b) and (c )`

Text Solution

Verified by Experts

The correct Answer is:
a
According to law of conservation of mass, in all chemical changes the total mass of the system remains constant or in a chemical reaction, mass is neither be created nor be destroyed. This law was proposed by Lavosier and tested by Landolt.
But in (b) and (c ), mass of reactants is not equal to the mass of products.
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Knowledge Check

  • Which of the following data illustrates the law of conservation of mass?

    A
    56 g of CO reacts with 32 g oxygen to produce 44 g of `CO_(2)`
    B
    1.70 g of `AgNO_(3)` reacts with 100 mL of 0.1 MHCl to produce 1.435 g of AgCl and 0.63 g of `HNO_(3)`.
    C
    12 g of C is heated in vaccume and on cooling there is no change on mass.
    D
    None of the above.

  • According to law of conservation of mass

    A
    The mass of product remains constant
    B
    The total mass remains constant
    C
    The mass of products remains constant
    D
    All of the above

  • Which of the following is the best example of law of conservation of mass

    A
    (a)`12 g` of carbon combines with `32 g` of oxygen to from `44 g` of `CO_(2)`
    B
    (b)When `12 g` of carbon is heated in a vacuum there is no change in mass
    C
    (c )A sample of air increase in volume when heated at constant pressure but its mass remains unaltered
    D
    (d)The weight of a piece of platinum is the same before and after heating in air
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