The main buffer system of the human blood is____________?

A. H2co3 – hco3
B. H2co3 – co32-
C. Ch3cooh – ch3coo–
D. Nh2conh2 – nh2conh+

The most commonly used bleaching agent is_________?

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

The heat required to raise the temperature of body by 1 K is called___________?

A. Specific heat
B. Thermal capacity
C. Water equivalent
D. None of the above

The mass of P4O10 that will be obtained from the reaction of 1.33 gram of P4 and 5.07 of oxygen is___________?

A. 2.05 gram
B. 3.05 gram
C. 4.05 gram
D. 5.05 gram

The octane number of zero is assigned to____________?

A. 2-methyl octane
B. N-heptane
C. Iso-octane
D. 3-methyl octane

The Latin word formica means ant. The name formic acid is derived from this Latin word because__________?

A. This acid, in ancient times, was used to eliminate ant-hills
B. This corrosive acid is secreted by ants to drive away their enemies
C. This acid was first obtained by the distillation of ants
D. Ants are attracted by the odour of this acid

The heat energy produced when the human body metabolises 1 gram of fat is__________?

A. 30 kj
B. 1 kj
C. 39 kj
D. 29 kj

The molecular formula for cholesterol is C27 H46 O. What are the degrees of unsaturation for this compound?

A. 5
B. 6
C. 7
D. 8

The most appropriate method for separating a large quantity of a mixture of nonvolatile, nonpolar organic compounds would be__________?

A. Distillation
B. Extraction
C. Gas chromatography
D. Column chromatography

The relatively high energy of the gauche conformation of butane is primarily associated with_________?

A. Angle strain
B. Torsional strain
C. Steric strain
D. Orbital strain