Chemistry

The separation of petroleum fractions depends on the differences in their?

A. melting points B. molar masses C. solubilities D. boiling points Correct Answer: Option D D. boiling points

6 years ago

Which of the following cells produce electrical energy from chemical reactions?

l. Lead-acid battery ll. Dry cell III. Daniell cell IV Electrolytic cell A. l and ll only B. l, ll,…

6 years ago

Consider the reaction represented by the equation: N2O4(g) ⇌ 2NO2(g) ; ∆H = + x kJmol-1. What happens when the temperature is reduced at equilibrium?

A. Concentration of N2O4(g) decreases B. Concentration of N2O4(g) increases. C. Pressure exerted by the gases increases D. Pressure exerted…

6 years ago

The following factors affect the solubility of a solid in a given solvent except?

A. nature of solute B. nature of solvent C. pressure D. temperature Correct Answer: Option C C. pressure

6 years ago

A substance is said to be impure if?

A. its melting point range is wide B. it dissolves in water with difficult C. it has a low melting…

6 years ago

Which of the following compounds crystallizes without water of crystallization?

A. MgSO4 B. Na2CO3 C. NaCI D. FeSO4 Correct Answer: Option C C. NaCI

6 years ago

Which of the following acids would readily react with CaCO3 to liberate CO2?

A. CH3COOH B. H2SO4 C. H2SO3 D. HNO3 Correct Answer: Option B B. H2SO4 Explanation H2SO4(aq)+CaCO3(aq)→CaSO4(aq)+CO2(g)+H2O(l)

6 years ago

The aqueous solution which has pH > 7 is?

A. FeCI3(aq) B. CuSO4(aq) C. KNO3(aq) D. Na2CO3(aq) Correct Answer: Option D D. Na2CO3(aq)

6 years ago

When heat is absorbed during a chemical reaction, the reaction is said to be?

A. adiabatic B. endothermic C. exothermic D. isothermal Correct Answer: Option B B. endothermic

6 years ago

Which of the following variables is a measure of the average kinetic energy of the molecule of a gas?

A. Density B. Pressure C. Temperature D. Volume Correct Answer: Option C C. Temperature

6 years ago