Chemistry

The gas that is liberated when iron is heated with concentrated tetraoxosulphate (VI)acid is?

A. H2S B. SO2 C. HCI D. SO3 E. O2 Correct Answer: Option B - SO2 Explanation 2Fe (s) +…

5 years ago

Which of the following correctly explains entropy?

A. the natural tendency for a system to achieve a greater disorder B. a balance of two driving forces between…

5 years ago

How many molecules are there in 14g of nitrogen gas at s.t.p? (n = 14, Avogadro Number = 6. 0 x 1023 mol-1)

A. 1.2 x 10²³ B. 3.0 x 10²³ C. 6.0 x10²³ D. 1.2 x 10²² E. 30 x10²³ Correct Answer:…

5 years ago

A catalyst which increases the rate of a chemical reaction does so by?

A. increasing the reaction pathway B. increasing the surface area of the reactants C. increasing the pressure on the system…

5 years ago

Which of the following compounds will undergo additional reactions?

A. Ethyne B. Butane C. Pentane D. Tetrachloromethane E. Ethanol Correct Answer: Option A - Ethyne

5 years ago

When a solid melts and consequently boils, there is?

A. a gradual increase in the average kinetic energy of the particles B. a sudden decrease in the kinetic energy…

5 years ago

Aluminum is above iron in the electrochemical series, yet iron corrodes easily on exposure to air while aluminium does not. This is because aluminium

A. has a lower density than iron B. is a better conductor than iron C. does not corrode spontaneously D.…

5 years ago

The heat accompanying the reaction represented by the equation H2O (l) → H2O(g) is described as the heat of

A. solution B. neutralization C. vaporization D. sublimation E. activation Correct Answer: Option C - vaporization

5 years ago

A sample of orange juice is suspected to have been contaminated with a yellow dye. Which of the following methods can be used to detect the dye?

A. Decantation B. Chromatography C. Distillation D. Filtration E. Evaporation Correct Answer: Option B - Chromatography

5 years ago

Which of the following reaction will not take place under normal conditions?

A. 2Zn(s) + 2HCI2(aq) → 2ZnCl2 + H2(g) B. Fe (s) + H2SO4(aq) → FeSO4(aq) + H2(g) C. Cu (s)…

5 years ago