JEE Main sBlock Elements Practice Questions With Solutions

Lime reacts exothermally with water to give 'A' which has low solubility in water. Aqueous solution of 'A' is often used for the test of CO${}_2$_{2}, a test in which insoluble B is formed. If B is further reacted with CO${}_2$_{2} then soluble compound is formed, 'A' is :

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Sodium is about 30 times as abundant as potassium in the oceans.

Reason R : Potassium is bigger in size than sodium.

In the light of the above statements, choose the correct answer from the options given below

For a good quality cement, the ratio of lime to the total of the oxides of $\mathrm{Si},\mathrm{Al}$Si , Al and $\mathrm{Fe}$Fe should be as close as to :

Given below are two statements:

Statement I : Lithium and Magnesium do not form superoxide

Statement II : The ionic radius of ${\mathrm{Li}}^{+}$Li^{+} is larger than ionic radius of ${\mathrm{Mg}}^{2+}$Mg^{2 +}

In the light of the above statements, choose the most appropriate answerfrom the options given below :

What is the purpose of adding gypsum to cement?

The product, which is not obtained during the electrolysis of brine solution is :

Ion having highest hydration enthalpy among the given alkaline earth metal ions is :

Structures of ${\mathrm{BeCl}}_2$BeCl_{2} in solid state, vapour phase and at very high temperature respectively are :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : Gypsum is used for making fireproof wall boards.

Reason (R) : Gypsum is unstable at high temperatures.

In the light of the above statements, choose the correct answer from the options given below :

Match List I with List II :

Choose the correct answer from the options given below :