51.

State one relevant observation for the following:

When the gaseous product obtained by dehydration of ethyl alcohol is passed through bromine water.

Given balanced chemical equations for the following conversion:

Ethanoic acid to ethyl ethanoate

Given balanced chemical equations for the following conversion

Calcium carbide to ethyne

Given balanced chemical equations for the following conversion:
Sodium ethanoate to methane

b) using their structure formulae identify the functional group by circling them:

i) dimethyl ether

ii) propanone

State one relevant observation for each of the following:

i) When a crystal of copper nitrate is heated in a test tube.

iii) When hydrogen sulphide gas is  passed through lead acetate solution.

Identify the anion present in each of the following compounds;

i)  A salt M on treatment with concentrated sulphuric acid produces a gas which fumes in the moist air gives dense fumes with ammonia.

ii)  A salt D on treatment with dilute sulphuric acid produces a gas which turns lime water milky but has no effect on acidified potassium dichromate solution.

iii) When barium chloride solution is added to salt solution E a white precipitate insoluble  in dilute hydrochloric acid is obtained.

Q7.  (c)  from the list of the following salts choose the salt that most appropriately fits the description given in the following:

[AgCl, MgCl₂, NaHSO₄, PbCO₃, ZnCO₃, KNO₃,Ca(NO₃)₂]

i) A deliquescent salt

ii) An insoluble chloride

iii)  On heating, this salt gives a yellow residue when hot and white when cold.

iv)On heating this salt, a brown coloured gas is evolved.

Select from the list the gas that matches the description given in each case:

[ammonia, ethane, hydrogen chloride, hydrogen sulphide, ethyne]

i) This gas is used as a reducing agent in reducing copper oxide to copper.

ii)  This gas produces dense white fumes with ammonia gas.’

iii) This gas is used for welding purposes

iv)  This gas is also a saturated hydrocarbon.

v)   This gas has characteristic rotten egg smell.