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In the following 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’. A. If both A and R are correct... View Article

In the following 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 O2 and 1 L of O3 contains the same number of moles under identical conditions. R: Under identical conditions, 1 L of O2 and 1 L of O3... View Article

In the following 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 a mixture. R: Cinnabar always contain 6.25 times more mercury than sulphur by weight. Brass... View Article

In the following 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 limiting reactant. R: Limiting reactant reacts completely in the reaction.... View Article

In the following 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 the mass number of carbon taken as 12.... View Article

In the following 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 of 1:8 by mass. R: Total mass of reactants and... View Article

In the following 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 12C. A. If both A and R are correct and R is the... View Article

In the following 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: In the equation NH3 + HCl → NH4Cl, Gay-Lussac’s law is not applicable to NH4Cl. R: NH4Cl is not a gas. A. If both A and R are... View Article

In the following 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 Gram molecule of sulphur also represents 1 gram atom of sulphur. R: Atomic city of sulphur is one. A. If both A and R are correct and R... View Article

In the following 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: Normality of 0.1 M H2SO4 is 0.2 N R: H2SO4 is a dibasic acid A. If both A and R are correct and R is the correct explanation of A B. If... View Article

Which of the following pairs of substances illustrates the law of multiple proportions?

A. CO and CO2 B. NaCl and NaBr C. H2O and D2O D. MgO and Mg(OH)2 Solution: (A) As per the law of multiple proportions, when two... View Article

Two containers P and Q of equal volume (1 litre each) contain 6 g of O₂ and SO₂ respectively at 300 K and 1 atmosphere, then;

A. Number of molecules in P is less than that in Q B. Number of molecules in P and Q is same C. Number of molecules in Q is less than that... View Article

Find the electric charge in couloumb of 9.0 gm of Al³⁺ ions.

A. 9.6 × 104 B. 6.9 × 104 C. 2.9 × 105 D. 4.80 × 10-19 Solution: (A) No of moles of Al3+ = 9 / 27 = 0.33 No.... View Article

An ore contains 1.24% of the mineral argentite Ag₂S by mass. How many grams of this ore would have to be processed in order to obtain 1.0 g of pure solid silver?

A. 23.15 g B. 69.45 g C. 92.6 g D. 46.3 g Solution: (C) Consider the mass of ore = x gm Molecular weight of Ag2S = 248g = (Mass of... View Article

0.32g of metal on treatment with an acid gives 112mL of hydrogen at NTP. Calculate the equivalent weight of the metal.

A. 58 B. 32 C. 11.2 D. 24 Solution: (B) Given, Mass of metal = 0.32 g Volume of hydrogen = 112ml = 112 × 10−3 L Now... View Article

What is the total number of atoms of elements present in a mole of ammonium dichromate?

A. 19 B. 6.023 x 1023 C. 114.47 x 1023 D. 84 x 1023 Solution: (C) So, 1 molecule of ammonium dichromate, (NH4)2 Cr2O7 will have 19... View Article

Which of the following has the highest normality?

A. 1M H2SO4 B. 1M H3PO3 C. 1M H3PO4 D. 1M HNO3 Solution: (A) Normality = Molarity × nfactor Since all have the same molarity.... View Article

Calculate the molarity of a solution obtained by mixing 50 mL of 0.5 M H₂SO₄ and 75 mL of 0.25 M H₂SO₄.

A. 0.375 M B. 0.35 M C. 0.045 M D. 0.45 M Solution: () No.of moles of 0.05 L H2SO4 = 0.5 x 0.05 = 0.025 No.of moles of 0.075 L H2SO4... View Article

The atomic weights of two elements X and Y are 20 and 40 respectively. If ‘a’ gm of X contains ‘b’ atoms, how many atoms are present in ‘2a’ gm of Y?

A. b B. a C. 2 b D. (2 a/b) Solution: (A) No of moles of X = a / 20 No. of atoms of X = a / 20 × N = b (given) = a = 20b / N... View Article

Which of the following represents the formula of a compound which contains 26% nitrogen and 74% oxygen?

A. N2O B. NO C. NO2 D. N2O5 Solution: (D) Given, % Nitrogen in the compound = 26%, % Oxygen in the compound = 74%, So, mass of... View Article