Chemistry

A compound that gives a brick-red colour to a non-luminous flame is likely to contain?

A. copper ions B. sodium ions C. calcium ions D. aluminium ions Correct Answer: Option C - calcium ions

5 years ago

In the electrolytic extraction of calcium from calcium chloride, the cathode is?

A. zinc B. graphite C. platinum D. iron Correct Answer: Option D = iron

5 years ago

In the extraction of sodium from fused sodium chloride, the anode is made of platinum because?

A. sodium is formed at the anode B. chlorine is formed at the anode C. sodium does not react with…

5 years ago

Fluorine does not occur in the free state in nature because?

A. it is a poisonous gas B. it belongs to the halogen family C. it is inert D. of its…

5 years ago

The gas that is removed by the water in the flask is?

A. O2 B. SO2 C. HCI D. H2 Correct Answer: Option C = HCI

5 years ago

Which of the following will shift to the left from dilute tetraoxosulphate (VI) acid?

A. Lead B. Magnesium C. Copper D. Gold Correct Answer: Option B - Magnesium

5 years ago

In a chemical reaction, the change in concentration of a reactant with time is?

A. entropy of reaction B. enthalpy of reaction C. rate of reaction D. order of reaction Correct Answer: Option C…

5 years ago

In an equilibrium reaction, Which of the following conditions indicates that maximum yield of the product will be obtained?

A. Equilibrium constant is very large B. ∆H - T∆S = O C. ∆ H > T ∆ S D.…

5 years ago

If the change in free energy of a system is -899 Jmol‾¹ and the entropy change is 10Jmol‾¹k‾¹ at 250C. Calculate the enthalpy change.

A. +2081 Jmol‾¹ B. -2081 Jmol‾¹ C. -649 Jmol‾¹ D. +649 Jmol‾¹ Correct Answer: Option A = +2081 Jmol‾¹ Explanation…

5 years ago

How many faraday of electricity is required to produce 0.25 mole of copper?

A. 1.00F B. 0.01F C. 0.05F D. 0.50F Correct Answer: Option D = 0.50F Explanation Cu → Cu²+ + 2e…

5 years ago