JAMB Chemistry Past Questions & Answers - Page 130

646.

In the diagram above the gas Y could be

A.

hydrogen chloride

B.

oxygen

C.

carbon (IV) oxide

D.

chlorine

Correct answer is A

- Two gases that can be used in the study of fountain experiment is ammonia gas and hydrogen chloride gas.

- Ammonia dissolves into the water and the pressure in the container drops. As a result, more water is forced into the container from another inlet creating a fountain effect.

- All the hydrogen chloride in the flask dissolves in the water drops from the pipette, creating a vacuum in the flask. Water is then sucked up at great speed from the bowl, creating a spectacular 'fountain' in the flask.

648.
649.

The functional group represented in the compound above is?

A.

alkanol

B.

alkanal

C.

alkanone

D.

alanoate

Correct answer is B

The carbonyl group in tha alkanal (aldehyde) family is always at the end of a carbon chain

650.

The option above shows the PH changes for the titration of a

A.

strong acid versus strong base

B.

weak acid versus strong base

C.

strong acid versus weak base

D.

weak acid versus weak base

Correct answer is B

Option B is a graph of weak a acid and strong base