Arrange the following in the order of increasing mass (atomic mass O = 16, Cu = 63, N = 14)
I. One atom of oxygen II. One atom of nitrogen III. 1×10−10 mole of oxygen IV. 1×10−10 mole of copper... View Article
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The total number of electrons present in 18 ml of water is:
A. 6.023 × 10−24 B. 6.023 × 1024 C. 6.023 × 1023 D. 12.023 × 1024 Solution: () The total... View Article
Which one of the following set of units represents the smallest and largest amount of energy respectively?
A. J and erg B. erg and cal C. cal and eV D. L−atm and J E. eV and L−atm... View Article
The percentage weight of Zn in white vitriol [ZnSO4.7H2O] is approximately equal to (at.mass of Zn = 65, S = 32, 0 = 16 and H = 1)
A. 33.65 % B. 32.56 % C. 23.65 % D. 22.65 % Solution: (D) Molecular weight of white vitriol [ZnSO4.7H2O]... 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 standard unit for expressing atomic mass is amu. R: Now a days amu is represented by ‘u’. A.... 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:... 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... 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... 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... 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:... 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... 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... 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.... 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... 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... 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... 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... 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 =... 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... 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... View Article
