Post Utme Chemistry Past Questions and Answers

Question 741:

Which of the buffer system of the human blood is ____________

A. \(H_2CO3°HCO3 \)
B. \(H_2CO_3°CO_3\)
C. \(CH_3COOH-CHiCO0\)
D. \(NH_2CONH_2° NH_2CONH_2\)

Question 742:

The gas present in the stratosphere which filters out some of the sun’s ultraviolet light and provides an effective shield against radiation damage to living things is ____________

A. Helium
B. Ozone
C. Oxygen
D. Methane

Question 743:

The most commonly used bleaching agent is ____________

A. Alcohol
B. Carbon dioxide
C. Chlorine
D. Sodium chloride

Question 744:

The nucleus of a hydrogen atom consist of ____________

A. 1 Proton only
B. 1 Proton +2 neutron
C. 1 Proton only
D. Electron only

Question 745:

The gas giving off when NH4Cl is heated with an alkali is ____________

A. Nz
B. Ch
C. He
D. NH3