Chemistry Past Questions and Answers

The label on a reagent bottle containing a clear organic liquid dropped off.The liquid was neutral to litmus and gave a colourless gas with metallic sodium. The liquid must be an?

A Alkanoate
B Alkaene
C Alkanol
D Alkane

Question 647:

Alkaonic acids have low volatility compared with alkanols because they?

A Are more polar than alkaonls
B Have two oxygen atoms while alkanols have one
C Form hydrogen bonds while alkanols do not
D Form two hydrogen bonds while alkanols form one

Question 648:

The octane number of a fuel whose performance is the same as that of a mixture of 55 g of 2,2,4- trimethly pentane and 45 g of n-heptane is ?

A 45
B 55
C 80
D 100

Question 649:

Which of the following is formed when maltose reacts with concentrated tetraoxosulphate (VI) acid ?

A Carbon (IV) oxide
B Coal tar
C Charcoal
D Toxic fumes

Question 650:

If a gas occupies a container of volume 146 cm<sup style='font-size: smaller;'>3</sup> at 18°C and 0.97`atm, its volume 146cm<sup style='font-size: smaller;'>3</sup> at s.t.p is?

A 133
B 146
C 266
D 292