Chemistry Past Questions and Answers

Which of the following statements is/are correct about tin plating? l The electrolyte must be a soluble salt of tin ll. the objective to be plated is made the cathode lll. The anode is made of tin lV. The negative electrode dissolves

A L only
B L and ll only
C L,ll and lll only
D L, ll and lV only

Question 2772:

Determine the amount of electrons needed to deposit 6.4g of copper during the electrolysis of copper (ll) tetraoxosulphate (IV) solution [Cu = 64]

A 0.10 mole
B 0.20 mole
C 1.0 mole
D 2.0 mole

Question 2773:

A given fuel has an octane number of 100. This means that

A The knocking tendency of the fuel is low
B The fuel is a mixture of several hydrocarbons
C A large amount of alkanes is present in the fuel
D The fuel needs to be cracked before use

Question 2774:

The equation for the reaction at the anode during the electrolysis of concentrated sodium chloride solution is

A 2CI-(aq) â†’ CI,sub>2(g) + 2e-
B 40H-(aq) → 2H2O(I) + O2(g) + 4e -
C Na+(aq) + e- â†’ Na(s)
D 2H+(aq) + 2e- â†’ H2(g)

Question 2775:

Which of the following compounds has the same empirical formula as benzene?

A C2H2
B C2H4
C C4H6
D C6H12