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Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer from (a), (b) ,(c) and (d) (Atomic mass :N = 14, O = 16, Cu = 63).

I. 1 molecule of oxygen II. 1 atom of nitrogen III. 1 × 10-10 g molecular weight of oxygen IV.... View Article

How many millilitres (mL) of 1 M H₂SO₄ solution is required to neutralise 10 mL of 1 M NaOH solution?

A. 2.5 B. 5.0 C. 10.0 D. 20.0 Solution: (B) The reaction is, H2SO4 + 2NaOH → Na2SO4+ 2H2O Using... View Article

0.115 g of pure sodium metal was dissolved in 500 ml distilled water. The normality of the above solution, whose resulting volume is 400 ml, would be;

A. 0.010 N B. 0.0115 N C. 0.0125 N D. 0.046 N Solution: (A) Weight of solute = 0.115 g... View Article

A 5 molar solution of H₂SO₄ is diluted from 1 litre to a volume of 10 litres, the normality of the solution will be;

A. 1 N B. 0.1 N C. 5 N D. 0.5 N Solution: () N1V1 = N2V2 Given, molarity of... View Article

A metal (M) sulphate contains 9.87% of M. It is an isomorphous sulphate with ZnSO₄.7H₂O. What will the atomic weight of M be;

A. 40.3 B. 36.3 C. 24.3 D. 11.3 Solution: (C) Let x = at the mass of M S =... View Article

The molecular weight of O₂ and SO₂ are 32 and 64 respectively. At 15^oC and 150 mm Hg pressure, one litre of O₂ contains ‘N’ molecules. The number of molecules in two litres of SO₂ under the same conditions of temperature and pressure will be:

A. N/2 B. N C. 2N D. 4N Solution: (C) If we recall Avogadro’s law it states,”equal volumes of all... View Article

Boron has two stable isotopes, 10B(19%) and 11B(81%). The atomic mass that should appear for boron in the periodic table is

A. 10.8 B. 10.2 C. 11.2 D. 10.0 Solution: (B) Average atomic weight = ∑% abundant × atomic mass /... View Article

Ratio of C_p and Cv of a gas ‘X’ is 1:4. The number of atoms of the gas ‘X’ present in 11.2 L of it at NTP will be;

A. 6.02 × 1023 B. 1.2 × 1023 C. 3.01 × 1023 D. 2.01 × 1023 Solution: (A) Ratio of... View Article

A metal oxide has the formula Z₂O₃. It can be reduced by hydrogen to give free metal and water. 0.1596 g of the metal oxide requires 6 mg of hydrogen for complete reduction. The atomic weight of the metal is;

A. 27.9 B. 159.6 C. 79.8 D. 55.8 Solution: (D) Z2O3 + 3H2 → 2Z + 3H2O 1 mole of... View Article

1 c.c. of N₂O at NTP contains:

A. 1.8 / 224 × 1022 atoms B. 6.02 / 22400 × 1023 molecules C. 1.32 / 224 × 1023... View Article

The density of gas A is three times that of gas B. If the molecular weight of A is M, the molecular weight of B is;

A. 3M B. √3M C. M / 3 D. M / √3 Solution: (C) d ∝ M ⇒ d1 /... View Article

1mol of CH₄ contains?

A. 6.02 × 1023 atoms of H B. 4g atom of hydrogen C. 1.81 × 1023 molecules of CH4 D.... View Article

A molar solution is one that contains one mole of solute in:

A. 100 ml of solvent B. 1000 g of solvent C. 1 liter solution D. 22.4 liter of solution Solution:... View Article

Crystals of which pair are isomorphous?

A. ZnSO4, SnSO4 B. MgSO4, CaSO4 C. ZnSO4, MgSO4 D. PbSO4, NiSO4 Solution: (A) ZnSO4 crystal is Orthorhombic SnSO4 crystal... View Article

In known elements, the maximum number is of;

A. Metals B. Non-metals C. Metalloids D. None of these Solution: (A) If we look at the mordern periodic table,... View Article

Number of molecules in 100 ml of each of O₂ NH₃ and CO₂ at STP are in the order:

A. CO2 > O2 > NH3 B. NH3 > O2 > CO2 C. All are equal D. NH3 = CO2... View Article

What will the atomic weight of metal be? Given, the vapour density of a metal chloride is 6.6 and its oxide contains 53% metal.

A. 21 B. 54 C. 27.06 D. 2.086 Solution: (C) VD of metal chloride = 66 To find, the atomic... View Article

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