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If 20 g of CaCO₃ is treated with 100 mL of 20% HCl solution, the amount of CO₂ produced is:

A. 22.4 L B. 8.80 g C. 4.40g D. 2.24 L Solution: (B) CaCO3 + 2HCl → CaCl + CO2 + H2O 100 g 73 g 44 g 100mL of 20% HCl solution... View Article

A 5.82g silver coin is dissolved in nitric acid. When sodium chloride is added to the solution, all the silver is precipitated as AgCl . The AgCl precipitate weighs 7.20g . The percentage of silver in the coin is;

A. 60.3% B. 80% C. 93.1% D. 70% Solution: (C) Weight of AgCl precipitated = 7.2 g Weight of Ag in the precipitate = (108 g) / (143.5... View Article

An organic compound has an empirical formula CH₂O, its vapour density is 45. The molecular formula of the compound is:

A. CH2O B. C2H5O C. C2H2O D. C3H6O3 Solution: () The empirical formula is CH2O. Therefore, the empirical weight = 30 g. Given, the... View Article

The empirical formula of a compound is CH₂. One mole of this compound has a mass of 42g. Its molecular formula is:

A. C3H6 B. C3H8 C. CH2 D. C2H2 Solution: (A) The empirical formula is CH2 Empirical weight of CH2 = 12 + (1 × 2) = 12 + 2 = 14... View Article

An organic compound contains 10.06 % carbon 0.84 % hydrogen and 89.10 % chlorine. What will be the empirical formula of the substance?

A. CH2Cl2 B. CCl4 C. CHCl3 D. CH3Cl Solution: (C) Carbon. 10.06 / 12 = 0.8383 Hydrogen 0.84 / 1 = 0.84 Chlorine. 89.1 / 35.5 = 2.51... View Article

The equivalent weight of a certain trivalent element is 20. The molecular weight of its oxide is;

A. 168 B. 68 C. 152 D. 56 Solution: (A) Atomic mass of element = Equivalent mass of element × Valency Atomic mass of element =... View Article

If molecular weight of KMnO₄ is M, then its equivalent weight in acidic medium would be;

A. M B. M / 2 C. M / 5 D. M / 3 Solution: (C) MnO−4 + 8H+ + 5e− → Mn2 + 4H2O Electrons gained = 5 Molecular weight... View Article

What is the equivalent weight of SnCl₂ in the following reaction;

SnCl2 + Cl2 → SnCl4 A. 95 B. 45 C. 60 D. 30 Solution: (A) SnCl2 + Cl2 → SnCl4 Equivalent weight of SnCl2 = mol.wt. / 2 =... View Article

Camphor is often used in molecular mass determination because;

A. It is readily available B. It has a very high cryoscopic constant C. It is volatile D. It is solvent for organic substances Solution:... View Article

Of two oxides of iron, the first contained 22% and the second contained 30% of oxygen by weight. The ratio of weights of iron in the two oxides that combine with the same weight of oxygen is;

A. 3:2 B. 2:1 C. 1:2 D. 1:1 Solution: (A) For first oxide, Moles of oxygen = 22 / 16 = 1.375, Moles of Fe = 78 / 56 = 1.392... View Article

An alkaloid contains 17.28 % of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of the alkaloid is;

A. Five B. Four C. Three D. Two Solution: (D) Amount of nitrogen present in one mole of alkaloid i.e., in 162g = 162 × 17.28 /... View Article

The percentage of element M is 53 in its oxide of molecular formula M₂O₃. Its atomic mass is about;

A. 45 B. 9 C. 18 D. 36 E. 27 Solution: (E) Let us assume the atomic mass of M = x Therefore, molecular weight of compound = 2x + 16... View Article

The equivalent weight of KMnO4 for acid solution is;

A. 79 B. 31.6 C. 52.16 D. 158 Solution: (B) An equivalent weight of a solution is defined as the molecular weight of the solute divided... View Article

If the molecular wt. of Na₂S₂O₃ and I₂ are M₁ and M₂ respectively, then what will be the equivalent wt. of Na₂S₂O₃ and I₂ in the following reaction?

A. M1, M2 B. M1, M2 / 2 C. 2M1, M2 D. M1, 2M2 Solution: (B) ∴ Equivalent mass of S2O2−3 = M1 / 1 = M1 Equivalent mass of... View Article

Archives

If 20 g of CaCO₃ is treated with 100 mL of 20% HCl solution, the amount of CO₂ produced is:

A 5.82g silver coin is dissolved in nitric acid. When sodium chloride is added to the solution, all the silver is precipitated as AgCl . The AgCl precipitate weighs 7.20g . The percentage of silver in the coin is;

An organic compound has an empirical formula CH₂O, its vapour density is 45. The molecular formula of the compound is:

The empirical formula of a compound is CH₂. One mole of this compound has a mass of 42g. Its molecular formula is:

An organic compound contains 10.06 % carbon 0.84 % hydrogen and 89.10 % chlorine. What will be the empirical formula of the substance?

The equivalent weight of a certain trivalent element is 20. The molecular weight of its oxide is;

If molecular weight of KMnO₄ is M, then its equivalent weight in acidic medium would be;

What is the equivalent weight of SnCl₂ in the following reaction;

Camphor is often used in molecular mass determination because;

Of two oxides of iron, the first contained 22% and the second contained 30% of oxygen by weight. The ratio of weights of iron in the two oxides that combine with the same weight of oxygen is;

An alkaloid contains 17.28 % of nitrogen and its molecular mass is 162. The number of nitrogen atoms present in one molecule of the alkaloid is;

The percentage of element M is 53 in its oxide of molecular formula M₂O₃. Its atomic mass is about;

The equivalent weight of KMnO4 for acid solution is;

If the molecular wt. of Na₂S₂O₃ and I₂ are M₁ and M₂ respectively, then what will be the equivalent wt. of Na₂S₂O₃ and I₂ in the following reaction?

2gm of metal carbonate is neutralized completely by 100 mL of 0.1(N)HCl. The equivalent weight of metal carbonate is;

A compound has the molecular formula, X₄O₆. If 10 g of X4O6 has 5.72 g X , then calculate atomic mass of X.

0.56 g of gas occupies 280cm3 at NTP. Then its molecular mass is:

Number of atoms in 560 g Fe (atomic mass 56 g mol^-1) is:

Total number of atoms in 44g of CO₂ is;

How many moles of Al2(SO4)3 would be in 50g of the substance?

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