Neco Chemistry Past Questions and Answers

Question 46:

• NECO 2003

What mass of silver is deposited when a current of 2.6 A is passed through a solution of a silver salt for 40 minutes? [Ag= 108 ; F=96500C]

A. 6.89g
B. 6.93g
C. 6.98g
D. 7.04g
E. 7.12g

Question 47:

• NECO 2003

An atom of element X has an electronic configuration of \( 1s^22p^33s^23p^2. \) In which group of the periodic table is X?

A. \( \text{0} \)
B. 2
C. 3
D. 4
E. 5

Question 48:

• NECO 2003

Which metal is a constituent of both bronze and solder?

A. Copper
B. Lead
C. Silver
D. Tin
E. Zinc

Question 49:

• NECO 2003

What change will occur during the electrolysis of brine using carbon electrodes?

A. Chlorine will be given off at the cathode
B. Oxygen gas will be given off at the anode
C. Sodium will be deposited at the cathode
D. The resulting solution, after electrolysis, will be acidic.
E. The volumes of hydrogen and chlorine given off during the same time are equal

Question 50:

• NECO 2003

Which metal bromide is widely used in photography?

A. Calcium bromide
B. Magnesium bromide
C. Potassium bromide
D. Silver bromide
E. Sodium bromide