Q41 of 55 Page 7

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : Combustion of 16 g of methane gives 18 g of water.


Reason (R) : In the combustion of methane, water is one of the products.


Combustion of methane is given by the reaction


CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)


If 1 mol of methane is combusted completely, it will give 2 mol of H2O. Hence, 16g of methane on combustion gives 36g of H2O not 18g.


So, from the above reaction we can conclude that H2O is a product.

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39

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : One atomic mass unit is defined as one twelfth of the mass of one carbon-12 atom.


Reason (R) : Carbon-12 isotope is the most abundant isotope of carbon and has been chosen as standard.


 40

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A) : Significant figures for 0.200 is 3 whereas for 200 it is 1.


Reason (R) : Zero at the end or right of a number are significant provided they are not on the right side of the decimal point.


 38

In the following question a statement of Assertion →A) followed by a statement of Reason →R) is given. Choose the correct option out of the choices given below each question.

Assertion →A) : The empirical mass of ethene is half of its molecular mass.


Reason →R) : The empirical formula represents the simplest whole number ratio of various atoms present in a compound.


i) Both A and R are true and R is the correct explanation of A.


ii) A is true but R is false.


iii) A is false but R is true.


iv) Both A and R are false.


 41

In the following question a statement of Assertion →A) followed by a statement of Reason →R) is given. Choose the correct option out of the choices given below each question.

Assertion →A) : Combustion of 16 g of methane gives 18 g of water.


Reason →R) : In the combustion of methane, water is one of the products.


i) Both A and R are true but R is not the correct explanation of A.


ii) A is true but R is false.


iii) A is false but R is true.


iv) Both A and R are false.