Question

Which of the following is called black ash?

Solution

Correct option is

Na2CO3 + CaS

Na2CO3 + CaS is called black ash.

SIMILAR QUESTIONS

Q1

The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

Q2

Which of the following on thermal decomposition yields a basic as well as an acidic oxide?

Q3

 

Choose the correct statement :

The reason for use of polyphosphates as water softening agents is, that

Q4

Lithium can not be stored in kerosene oil because

Q5

Which one out of the NaOH and KOH, is a better absorber of CO2?

Q6

 

Which product is formed in the following reaction

 

Q7

 

The general formula of an alum is 

where M is univalent and M’ is a trivalent metal which of the following does not form alum?

Q8

Which of the following is a neither deliquescent nor efflorescent and is used for wool washing?

Q9

Which of the following is commercially known as oxone?

Q10

An alloy of which pair of metals is liquid at ordinary temperature and is used in special thermometers used for finding temperature above the boiling point of mercury.