A metal ore is converted to its oxide and the gas evolved during that process turns lime water milky. This process can be ___.

roasting

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

calcination

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

Smelting

No worries! We‘ve got your back. Try BYJU‘S free classes today!

leaching

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct options are
A roasting
B calcination

Processes used for converting metal ore to metal oxide are roasting and calcination.

Roasting is done for sulphide ores which produce metal oxides and $S O_{2}$ .

Calcination is done for carbonate ores which produce metal oxide and $C O_{2}$ .

$C O_{2}$ reacts with lime water $C a (O H)_{2}$ to form calcium carbonate( $C a C O_{3}$ ) which is milky white in colour.

$C a (O H)_{2} + C O_{2} \to C a C O_{3} + H_{2} O$

Sulphur dioxide also turns lime water milky.

Suggest Corrections

Similar questions

Kalyani was heating an ore X of Zinc in absence of air. She observed that a gas Y is evolved in this process. When she passed the gas through a solution of slaked lime, it turned milky. The ore X and gas Y are-

Q. When an organic compound is heated with dry cupric oxide and the gases evolved are passed through lime water which turns milky, the gas may be ______ or ______ .

Q. Salt

A

commonly used in bakery products, on heating, gets converted into another salt

B

which itself is used for removal of hardness of water and a gas

C

is evolved. The gas

C

when passed through lime water turns it milky. Identify

A, B

and

C

Q. Salt A, commonly used in bakery products, on heating, gets converted into another salt B. B is used for the removal of hardness of water and a gas C is evolved. The gas C when passed through lime water, turns it milky. Identify A, B, and C.

Q. Acetic acid is heated with

N a_{2} C O_{3}

in a test tube. A colourless and odourless gas (X) is evolved. The gas turns lime water milky. Identify X.

Join BYJU'S Learning Program