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In each of the follwoing questions, two statements are given, one is Assertion (A) and the other is Reason (R). Examine the statements carefully and mark the correct answer according to the instructions given below : A : Atomic mass of sodium is 23 u. R : An atom of sodium is 23 times heavier than an atom of $ {12} ^ C $
In each of the follwoing questions, two statements are given, one is Assertion (A) and the other is Reason (R). Examine the statements carefully and mark the correct answer according to the instructions given below : A: Pure water, irrespective of its source always contain hydrogen and oxygen in the ratio 1 : 8 bymass. R : Total mass of reactants and products remains constant during physical or chemical change
The statement A is correct as pure water always contains hydrogen and oxygen in the ratio of 1:8 by mass. The statement R is also correct as the total mass of reactants and products remains constant during a chemical reaction. However, R is not the correct explanation for A.
In each of the follwoing questions, two statements are given, one is Assertion (A) and the other is Reason (R). Examine the statements carefully and mark the correct answer according to the instructions given below : A : Mass numbers of most of the elements are fractional. R: Mass numbers are obtained by comparing with mass number of $ {12} ^ C $ .
Both statements A and R are incorrect. Mass numbers of elements are always whole numbers and not fractional. Mass numbers are determined by comparing with the mass of a carbon-12 atom, which is assigned a mass number of 12 exactly.
In each of the follwoing questions, two statements are given, one is Assertion (A) and the other is Reason (R). Examine the statements carefully and mark the correct answer according to the instructions given below : A : The mass of the products formed in a reaction depends upon the limting reactant. R: Limting reactant reacts completely in the reaction.
The mass of products formed in a reaction depends on the limiting reactant because the limiting reactant gets consumed completely. The other reactants remain in excess.
In each of the follwoing questions, two statements are given, one is Assertion (A) and the other is Reason (R). Examine the statements carefully and mark the correct answer according to the instructions given below : A : Cinnabar is a chemical compound whereas brass is mixture. R : Cinnabar always contain 6.25 times mercury than sulplur by weight. Brass can have any proportion of Cu and Zn.
Cinnabar is a chemical compound (HgS) with a fixed composition, while brass is an alloy (mixture) of copper and zinc in varying proportions. The statement about cinnabar's composition is correct.
In each of the follwoing questions, two statements are given, one is Assertion (A) and the other is Reason (R). Examine the statements carefully and mark the correct answer according to the instructions given below : A : $1 L of O_2 and 1 L of O_3 $ contains the same number of moles under identical conditions. R : Under identical conditions, $1 L of O_2 and 1 L of O_3 $ contain the same number of oxygen atoms
The assertion that 1L of O2 and 1L of O3 contain the same number of moles under identical conditions is correct, as the mole is a measure of the amount of substance. However, the reason is incorrect because O3 has more oxygen atoms per molecule compared to O2.
In each of the follwoing questions, two statements are given, one is Assertion (A) and the other is Reason (R). Examine the statements carefully and mark the correct answer according to the instructions given below : A : The standard unit for expressing atomic mass is amu. R : Now a days amu is represented by ‘u’.
The assertion that the standard unit for expressing atomic mass is amu (atomic mass unit) is correct. The reason that nowadays amu is represented by 'u' is also correct, but it does not explain the assertion. The unit 'u' is simply a modern representation of the same atomic mass unit.
What is value of Boyle’s temperature of ethane gas when $ a= 5.489 dm^6 atm mol^{-2} and b = 0.0638 dm^3 atm mol^{-1} $
The value of universal gas constant R depends upon the
The Boyle’s temperature for the ideal gases is given by
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