91. Two containers P and Q of equal volumes contain 6 g of
A. No. of molecules in P is less than that in Q
B. No. of molecules in Q is less than that in P
C. No. of molecules in P and Q are same.
D. Cannot be determined
Answer : Option B
92. Which of the following pairs of substances illustrates the law of multiple proportions ?
Assertion (A) : Normality of 0.1M
Reason (R) :
A. If both A and R are correct and R is the correct explanation of A.
B. If both A and R are correct and R is not the correct explanation of A.
C. If A is correct R is wrong.
D. If both A and R are false.
Answer : Option A
Assertion (A) : 1 Gram molecule of sulphar also represents 1 gram atom of sulphur.
Reason (R) : Atomicity of sulphur is one
A. If both A and R are correct and R is the correct explanation of A.
B. If both A and R are correct and R is not the correct explanation of A.
C. If A is correct R is wrong.
D. If both A and R are false.
Answer : Option D
Assertion (A) : In the equation
Reason (R) :
A. If both A and R are correct and R is the correct explanation of A.
B. If both A and R are correct and R is not the correct explanation of A.
C. If A is correct R is wrong.
D. If both A and R are false.
Answer : Option A
Assertion (A) : Atomic mass of sodium is 23 u.
Reason (R) : An atom of sodium is 23 times heavier than an atom of
A. If both A and R are correct and R is the correct explanation of A.
B. If both A and R are correct and R is not the correct explanation of A.
C. If A is correct R is wrong.
D. If both A and R are false.
Answer : Option C
Assertion (A) : Pure water, irrespective of its source always contain hydrogen and oxygen in the ratio 1 : 8 by mass.
Reason (R) : Total mass of reactants and products remains constant during physical or chemical change.
A. If both A and R are correct and R is the correct explanation of A.
B. If both A and R are correct and R is not the correct explanation of A.
C. If A is correct R is wrong.
D. If both A and R are false.
Answer : Option B
Assertion (A) : Mass numbers of most of the elements are fractional.
Reason (R) : Mass numbers are obtained by comparing with mass number of
A. If both A and R are correct and R is the correct explanation of A.
B. If both A and R are correct and R is not the correct explanation of A.
C. If A is correct R is wrong.
D. If both A and R are false.
Answer : Option D
Assertion (A) : The mass of the products formed in a reaction depends upon the limting reactant.
Reason (R) : Limting reactant reacts completely in the reaction.
A. If both A and R are correct and R is the correct explanation of A.
B. If both A and R are correct and R is not the correct explanation of A.
C. If A is correct R is wrong.
D. If both A and R are false.
Answer : Option A
Assertion (A) : Cinnabar is a chemical compound whereas brass is mixture.
Reason (R) : Cinnabar always contain 6.25 times mercury than sulplur by weight. Brass can have any proportion of Cu and Zn.
A. If both A and R are correct and R is the correct explanation of A.
B. If both A and R are correct and R is not the correct explanation of A.
C. If A is correct R is wrong.
D. If both A and R are false.
Answer : Option A