Chemistry
A to F below relate to the source and extraction of either Zinc or aluminium
A : Bauxite,
B : Coke,
C : Cryolite,
D : Froth floatation,
E : Sodium hydroxide solution,
F : Zinc blende.
(i) Write down the three letters each from the above list which are relevant to – Aluminium.
(ii) Fill in the blanks using the most appropriate words from A to F :
(a) The ore from which aluminium is extracted must first be treated with …………… so that pure Aluminium oxide can be obtained.
(b) Pure Aluminium oxide is dissolved in …………… to make a conducting solution.
(iii) Write the formula of Cryolite.
Answer
(i) A : Bauxite and C : Cryolite are ores of aluminium. E : Sodium hydroxide solution is used in the dressing of the ore.
(ii) Fill in the blanks :
(a) The ore from which aluminium is extracted must first be treated with sodium hydroxide solution so that pure Aluminium oxide can be obtained.
(b) Pure Aluminium oxide is dissolved in Cryolite to make a conducting solution
(iii) Na3AlF6 — formula of Cryolite
Related Questions
Calcium, Copper, Lead, Aluminium, Zinc, Chromium, Magnesium, Iron. Choose the major metals from the list given above to make the following alloys :
(i) Stainless steel
(ii) Brass.
A strip of copper is placed in four different colourless salt solutions. They are KNO3, AgNO3, Zn(NO3)2, Ca(NO3)2. Which one of the solutions will finally turn blue.
When a metal atom becomes an ion : [Choose the correct answer from the choices A, B, C and D]
A : it loses electrons and is oxidized
B : it gains electrons and is reduced
C : it gains electrons and is oxidized
D : it loses electrons and is reducedName the following :
(i) A metal which is liquid at room temperature.
(ii) A compound added to lower the fusion temp. of the electrolytic bath in the extraction of Al.
(iii) The process of heating an ore to a high temperature in the presence of air.