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If 50 cm3 of a saturated solution of KNO3 at 40 °C contained 5:05 g of the salt; its solubility at the same temperature would be [KNO3 = 101]

A. 1.5 mol dm−3 B. 1.5 mol dm−3 C. 2.0 mol dm−3 D. 5.0 mol dm−3 Correct Answer: Option A…

3 years ago

What number of moles of oxygen would exert a pressure of 10 atm at 320 K in an 8.2 dm3 cylinder? [R=0.082 atm dm−3 mol−1 K−1]

A. 0.32 B. 1.52 C. 3.13 D. 31.25 Correct Answer: Option C = 3.13 Explanation P = 10atm, T= 320K,…

3 years ago

A hydrogen chloride gas reacted with oxygen gas to yield water and chlorine gas. The mole ratio of the hydrogen chloride gas to water is?

A. 1:3 B. 2:1 C. 3:1 D. 4:1 Correct Answer: Option B = 2:1 Explanation 4HCl + O2 -- 2Cl2…

3 years ago

Which of the following statements about liquids is/are true?

I. Liquids maintain their volume at constant temperature. II. Liquids have fixed shape III. Liquids do not diffuse IV. Change…

3 years ago

When air in a syringe is compressed such that there is no change in temperature, the

A. air liquefies B. pressure increases C. intermolecular space increases D. density decreases Correct Answer: Option B - pressure increases…

3 years ago

Consider the following reaction equation: N2(g) + 3H2(g); ∆H = -92kJ

A. shift the equilibrium to the right B. increase the yield of ammonia C. decrease the amount of hydrogen D.…

3 years ago

Which of the following statements about an equilibrium system is correct?

A. Forward and backward reactions occur at the same rate B. The concentrations of reactants must equal that of the…

3 years ago

Graphite is used as a dry lubricant due to the presence of?

A. mobile electrons B. free electrons C. octahedral structures D. layered structures Correct Answer: Option D - layered structures Explanation…

3 years ago

Which of the following gases is alkaline?

A. NO2 B. CO2 C. NH3 D. N2O Correct Answer: Option C - NH3 Explanation Alkaline gases are any gaseous…

3 years ago

What is the partial pressure of oxygen at s.t.p. in a gaseous mixture containing 100 cm3 of oxygen and 900 cm3 of nitrogen gas?

A. 1.0 atm B. 0.1 atm C. 9.0 atm D. 0.9 atm Correct Answer: Option B - 0.1 atm Explanation…

3 years ago