91. Two containers P and Q of equal volumes contain 6 g of \(O_{2}\) and \(SO_{2}\) respectively at 300K and 1 atmosphere. Then
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 ?
A. \(CO\) and \(CO_{2}\)
B. \(NaCl \) and \(NaBr\)
C. \(H_{2}O\) and \(D_{2}O\)
D. \(MgO\) and \(MG(OH)_{2}\)
Answer : Option A
Assertion (A) : Normality of 0.1M \(H_{2}SO_{4}\) is 0.2N.
Reason (R) : \(H_{2}SO_{4}\) is a dibasic acid.
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 \(NH_{3}+HCl\rightarrow NH_{4}Cl\), Gay-Lussac’s law is not applicable to \(NH_{4}Cl\).
Reason (R) : \(NH_{4}Cl\) is not a gas.
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 \(^{12}\textrm{C}\).
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 \(^{12}\textrm{C}\).
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