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... View Article
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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... 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 /... 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... View Article
Which of the following chemical equations is incorrectly balanced?
A. Sb2S3 + 12HCl→ 2H3SbCl6 + 3H2S B. 3IBr + 4NH3 → NI3 + 3NH4Br C. 2KrF2 + 2H20 →... View Article
If the atomic mass of carbon were set at 50 amu, what would be the value of Avogadro’s number?
A. 5.01 × 1024 B. 6.022 × 1024 C. 1.66 × 1024 D. None of these Solution: (D) Given, Atomic... View Article
Aadhaar and Other Laws (Amendment) Act, 2019
Mr Ravi Shankar Prasad, Minister of Electronics and Information Technology, introduced the Aadhaar and Other Laws (Amendment) Bill 2019 in... View Article
Choose the proper option after studying the following statement (T = True, F = False)
1. The percent composition of vinyl chloride and its polymer PVC are the same. 2. The percent composition of phosphorus... View Article
The density of Al metal is 2.7 g cm-3. An irregularly shaped piece of aluminum weighing 40.0 g is added to a 100 mL graduated cylinder containing 50.0 mL of water. upto what height the water level will rise in the cylinder?
A. 14.8 mL B. 79.6 mL C. 64.8 mL D. 50 mL Solution: (C) d = m / v Now,... View Article
The unit J Pa-1 is equivalent to;
A. m3 B. cm3 C. dm3 D. None of these Solution: (A) J / Pa = Work / Pressure =... View Article
Haemoglobin present in blood contains 3.72% by mass iron. Calculate the number of iron atoms In 2.0 g of haemoglobin.
A. 4.53 × 1026 B. 4.53 × 1024 C. 5.95 × 1019 D. 8 × 1020 Solution: (D) Mass %... View Article
5.5 g of a mixture of FeSO4.7H2O and Fe2(SO4)3 9H2O requires 5.4 mL of 0.1N KMnO4 solution for complete oxidation. Calculate the number of moles of Fe2(SO4)39H2O in the mixture.
A. 0.0095 B. 0.15 C. 0.0952 D. 1.52 Solution: (A) Milliequivalent of KMnO4 = 5.4 x 0.1 = 0.54 milliequivalent... View Article
In the analysis of a 0.0500 g sample of feldspar, a mixture of the chlorides of sodium and potassium is obtained, which weighs 0.1180 g. Subsequent treatment of the mixed chlorides with silver nitrate gives 0.2451 g of silver chloride. What is the percentage of sodium oxide and potassium oxide in feldspar?
(a) 10.62% Na2O, 3.58% K2O (b) 3.58% Na2O, 10.62% K2O (c) 10.62% Na2O, 35.8% K2O (d) 35.8% Na2O, 10.62% K2O... View Article
Some statements are given below based on the pictures. Identify true and false statements.
(i) ‘P’ and ‘Q’ both indicate precision and accuracy. (ii) ‘Q’ indicates precision and accuracy while ‘R’ indicates neither precision... View Article
Calculate the number of sulphate ions in 100 mL of 0.001 M ammonium sulphate solution.
A. 6.022 x 10-19 B. 6.022 x 1019 C. 6.022 x 1020 D. 6.022 x 10-20 Solution: (B) No of... View Article
Calculate the concentration of nitric acid in moles per litre in a sample that has a density of 1.41 g mL-1 and the mass per cent of nitric acid in it being 69%.
A. 15.44 M B. 0.064 M C. 0.077 M D. 12.87 M Solution: (A) The mass per cent of 69%... View Article
Determine the empirical formula of an oxide of iron which has 69.9% iron and 30.1% oxygen by mass.
A. FeO B. Fe2O3 C. Fe3O4 D. Fe3O2 Solution: (B) The empirical formula of a compound may be defined as... View Article
Calculate the mass per cent of Na and S in sodium sulphate.
A. Na = 16.2%, S = 22.54% B. Na = 32.39%, S = 11.26% C. Na = 22.54%, S =... View Article
A naturally occurring Boron consists of two isotopes having atomic masses 10.01 and 11.01 respectively. Calculate the percentage of both the isotopes in natural Boron (Atomic mass of natural Boron = 10.81)
A. 20% and 80% B. 20% and 80% C. 25% and 75% D. 75% and 25% Solution: (A) Let x%... View Article
4.88g of KClO3 when heated produced 1.92g of O2 and 2.96g of KCl. Which of the following statements regarding the experiment is correct?
A. Law of conservation of mass B. Law of multiple proportions C. Law of definite proportions D. Avogadro’s Law Solution:... View Article
