In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions
Assertion (A) – Both 12 g of carbon and 27 g of aluminium will have `6.12xx10^(23)` atoms
Reason (R) – Gram atomic mass of an element contains Avogadro number of atoms
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions
Assertion (A) – Pure water obtained from different sources, such as river, well, spring, sea etc. always contains hydrogen and oxygen in ratio of 1:8 by mass
Reason (R) – Mass of reactants and products during chemical or physical changes is always constant
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions
Assertion (A) – Both 32 g of `SO_(2)` and 8g of `CH_(4)` have same number of molecules
Reason (R) – Equal moles of substances have equal number of molecules
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions
Assertion (A) – Relative atomic mass of boron is 10.8
Reason (R) – Boron has two isotopes B-10 and B-11 with percentage abundance of 19.6% and 80.4% respectively.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions
Assertion (A) – The standard unit for expressing the mass of an atom is a.m.u.
Reason (R) – a.m.u. is also called avogram
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions
Assertion (A) – The atomic mass of an element is not only relative but is average relative mass of an atom
Reason (R) – The average word is essential because the element, in general, is a mixture of different isotopes and atomic mass is the average of these relative atomic mass.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions
Assertion (A) – In a gaseous reaction, the ratio by volumes of reactant and gaseous products is in agreement with their molar ratio
Reason (R) – Volume of gas is inversely proportional to its number of moles at particular temperature and pressure.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions
Assertion (A) – One mole of water molecules at `4^(@)C` should occupy the volume of 18 mL
Reason (R) – Water contains `H_(2)O` molecules bonded by intermolecular H-bonds.
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true

In each of the following two questions two statements are given one labelled as the Assertion(A) or Statement I and the other labelled as the reason (R) or statement II. Examine these statements carefully and mark the correct choice as per following instructions
Assertion (A) – Both 106 g of sodium carbonate and 12 g of graphite have same number of carbon atoms
Reason (R) – Both 106 g sodium carbonate and 12 g of graphite contain 1 g-atom of carbon
A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not a correct explanation of A
C. A is true but R is false
D. A is false but R is true