Archives

A compound contains two oxygen atoms, four carbon atoms and the number of hydrogen atoms is double of carbon atoms. What is the density of vapour of this compound?

A. 88 B. 44 C. 132 D. 72 Solution: (B) M.F. C4H8O2 The compound contains two oxygen atoms, four carbon atoms and eight hydrogen... View Article

Calculate the amount of NaOH required to neutralize 100 mL 0.1 M H₂SO₄.

A. 40 g B. 0.4 g C. 80 g D. 0.8 g Solution: (D) 0.1 M H2SO4 = 1000 mL solution contains 0.1 mol H2SO4 100 0.01 mL solution contains... View Article

How much calcium oxide (CaO) can be obtained by heating 200 Kg of limestone that is 95% pure CaCO₃?

A. 104.4 kg B. 105.4 kg C. 212.8 kg D. 106.4 kg Solution: (D) Considering 100 kg impure sample has pure CaCO3 = 95 kg Therefore, 200... View Article

Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt. = 78.4) then minimum molecular weight of peroxidase anhydrous enzyme is:

A. 1.568 x 104 B. 1.568 x 103 C. 15.68 D. 2.136 x 104 Solution: (A) In peroxidase anhydrous enzyme 0.5% Se is present means 0.5 g Se is... View Article

Impure sample of ZnS contains 42.34% Zn. What is the percentage of pure ZnS in the smaple?

A. 67% B. 63% C. 58% D. 37% Solution: (B) The percentage of pure ZnS in the sample is 63%.... View Article

What weight of CuO will be required to provide 200 Kg copper?

A. 200 kg B. 79.5 kg C. 250 kg D. 100 kg Solution: (C) CuO ⟶ 2Cu + O2 Mass of CuO = ? g 1 mole of Cu ⟶ 63.5 u 1 mole of O ⟶ 16.0 u... View Article

In which of the following pairs percent compostion of element is not same?

A. Benzene and Ethyne B. But - 2 - ene and Cyclobutane C. Glucose and Fructose D. Phenol and Ethanol Solution: (D) The per cent... View Article

At STP, the density of CCl₄ vapour in g/L will be nearest to;

A. 6.87 B. 3.42 C. 10.26 D. 4.57 Solution: (A) As per Avogadro’s law, 1 mole of every substance will occupy 22.4 liters at STP and it... View Article

What is the normality of 0.3 M phosphorous acid:

A. 0.1 B. 0.9 C. 0.3 D. 0.6 Solution: (D) Phosphorous acid is a type of an ibasic acid because it has 2 replaceable H atoms.... View Article

Boron has two stable isotopes, ¹⁰B(19%) and ¹¹B(81%). Calculate the average atomic weight of boron in the periodic table.

A. 10.8 B. 10.2 C. 11.2 D. 10.0 Solution: (B) Average atomic weight = ∑% abundant × atomic mass / 100 = (19 × 10) +... View Article

The molecular weight of O₂ and SO₂ are 32 and 64 respectively. At 15°C and 150 mmHg 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 gases contain equal number of molecules under... View Article

The same amount of Zinc is treated separately with an excess sulphuric acid and excess sodium hydroxide. What will be the ratio of volumes of hydrogen evolved?

A. 1 : 1 B. 1 : 2 C. 2 : 1 D. 9 : 4 Solution: (A) Zinc reacts with excess of NaOH as; Zn + 2NaOH → Na2ZnO2 + H2 Zinc reacts... View Article

Archives

A compound contains two oxygen atoms, four carbon atoms and the number of hydrogen atoms is double of carbon atoms. What is the density of vapour of this compound?

Calculate the amount of NaOH required to neutralize 100 mL 0.1 M H₂SO₄.

How much calcium oxide (CaO) can be obtained by heating 200 Kg of limestone that is 95% pure CaCO₃?

Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt. = 78.4) then minimum molecular weight of peroxidase anhydrous enzyme is:

Impure sample of ZnS contains 42.34% Zn. What is the percentage of pure ZnS in the smaple?

What weight of CuO will be required to provide 200 Kg copper?

In which of the following pairs percent compostion of element is not same?

At STP, the density of CCl₄ vapour in g/L will be nearest to;

What is the normality of 0.3 M phosphorous acid:

Boron has two stable isotopes, ¹⁰B(19%) and ¹¹B(81%). Calculate the average atomic weight of boron in the periodic table.

The molecular weight of O₂ and SO₂ are 32 and 64 respectively. At 15°C and 150 mmHg 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:

The same amount of Zinc is treated separately with an excess sulphuric acid and excess sodium hydroxide. What will be the ratio of volumes of hydrogen evolved?

The number of oxygen atoms in 4.4 g of CO₂ is

How many significant digits are there in 0.25?

Volume occupied by one molecule of water (density 1 g cm^-3) is:

The drug which is used for treating AIDS victims is;

The number of atoms in 0.1 mole of a triatomic gas is (N_A = 6.023 × 10²³mol⁻¹).

In the final answer of the expression (29.2 − 20.2) (1.79 × 10⁵) / 1.37 the number of significant figures is.

Which has the maximum number of atoms?

1 L oxygen gas at STP will weigh:

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