6.10 Effect of Heat on Salts

Report 1 / 5

Salt \(Q\) is heated strongly until no reaction is observed. The brownish gas released from the heating process is tested using a glowing wooden splinter. The glowing wooden splinter is ignited after reacting with the gas. What is salt \(Q\)?

(A)		\(Mg(NO_3)_2\)

(B)		\(KNO_3\)

(C)		\(NaNO_3\)

(D)		\(MgCO_3\)

Difficulty Level: Medium

Report 2 / 5

Which of the following is true about the zinc nitrate salt?

I.		A covalent compound

II.		An ionic compound

III.		The colour of the salt is white

IV.		The colour of the residue after the decomposition reaction is yellow when hot and white when cool

Difficulty Level: Medium

Report 3 / 5

The following shows a set of salts.

- Calcium nitrate

- Potassium carbonate

- Magnesium carbonate

What is the similarity of these three salts?

(A)

All three decompose when heated strongly

(B)

All three are covalent compounds

(C)

The colour of the salt is the same

(D)

All are carbonate salts

Difficulty Level: Hard

Report 4 / 5

The decomposition of salt \(X\) releases a brownish gas and produces a black residue. What is salt \(X\)?

(A)		\(Zn(NO_3)_2\)

(B)		\(CuCO_3\)

(C)		\(Ag_2CO_3\)

(D)		\(Cu(NO_3)_2\)

Difficulty Level: Medium

Report 5 / 5

Which of the following salt is decomposed in heat to produce the metal?

(A)		\(KNO_3\)

(B)		\(ZnCO_3\)

(C)		\(AgNO_3\)

(D)		\(PbCO_3\)

Difficulty Level: Hard