(a) Name the chemical compound which is electrolysed in a molten state to obtain aluminium metal. Which gas is evolved during this process?
(b) Name the chemical compound which is electrolysed in a molten state to obtain sodium metal. Which gas is produced in this process?
(c) Name the gas produced when calamine ore is calcined.
(d) Name the gas evolved when cinnabar ore is roasted.

Open in App

Solution

(a) Aluminium oxide is electrolysed in the molten state to obtain aluminium metal. Oxygen gas is evolved during this process.

The equation for this decomposition is:
$2 A l_{2} O_{3} (l) Aluminium oxide E l e c t r o l y s i s - ------ \to 4 A l (l) Aluminium + 3 O_{2} (g) Oxygen$

(b) Sodium chloride is electrolysed in the molten state to obtain sodium metal. Chlorine gas is evolved during this process.

The equation for this decomposition is:

$2 N a C l (l) e l e c t r o l y s i s - ------ \to 2 N a (s) + C l_{2} (g)$

(c) Carbon dioxide $(C O 2)$ gas is produced when calamine ore is calcined.

$Z n C O_{3} (s) Zinc carbonate C a l c i n a t i o n - ------ \to Z n O (s) Zinc Oxide + C O_{2} (g) Carbon dioxide$

(d) Sulphur dioxide gas is evolved when cinnabar ore is roasted.

$2 H g S + 3 O_{2} R o a s t i n g (s u r p l u s o f a i r) - -------------- \to 2 H g O + 2 S O_{2}$

Suggest Corrections

Similar questions

Q. (a) Name the metal which is extracted from haematite ore?
(b) Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
(c) How is aluminium metal extracted? Explain with the help of an equation.
(d) Name the electrode at which aluminium metal is produced.
(e) Which gas is produced during the extraction of aluminium? At which electrode is this gas produced?
(f) What is an alloy? Name two alloys of aluminium.

Name the gas that evolved at cathode and anode when water is electrolysed. State their ratio by volume.

Q. (a) Why are covalent compounds generally poor conductors of electricity?
(b) Name the following compound:

Q. When zinc metal is treated with a dilute solution of a strong acid, a gas is evolved, which is utilised in the hydrogenation of oil. Name the gas evolved. Write the chemical equation of the reaction involved and also write a test to detect the gas formed.

(a) What is the difference between a mineral and an ore?
(b) Which metal is extracted from cinnabar ore?
(c) Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
(d) How is sodium metal extracted? Explain with the help of the equation of the reaction involved.
(e) Name three other metal s which are extracted in a manner similar to sodium.

Join BYJU'S Learning Program