Question

Which of the following chemicals is not present in clear hard water?

Solution

Correct option is

MgCO3

MgCOis insoluble in water.

SIMILAR QUESTIONS

Q1

Which pair does not show hydrogen isotopes?

Q2

 

An unknown inorganic compound (X) loses its water of crystallization on heating and its aqueous solution gives the following reactions:

(a)  It gives a white turbidity with dilute HCl solution

(b) It decolourises a solution of iodine in potassium iodide

(c)  It gives a white precipitate with silver nitrate solution which turns black on standing.

Identify the compound (X)

Q3

In photography, sodium thiosulphate is used for

Q4

Which of the following anhydrous halides can be prepared by heating its hydrates form?

Q5

 

The solubility in water of sulphates down the Be group is:

Be > Mg > Ca > Sr > Ba. This is due to

Q6

Which of the following is the correct order of gradually decreasing basic nature of the oxides?

Q7

KO2 (potassium superoxide) is used in oxygen cylinders in space and submarnies because it 

Q8

A metal M readily forms water soluble sulphate MSO4, water insoluble hydroxide M(OH)2 and oxide MO which becomes inert on heating. The hydroxide is soluble in NaOH. The metal M is

Q9

On dissolving moderate amount of sodium metal in liquid NH3 at low temperature, which one of the following does not occur?

Q10

Identify the least stable ion amongst the following