List of top Chemistry Questions on GROUP 1 ELEMENTS

Following are colours shown by some alkaline earth metals in flame test. Which of the following are not correctly matched?
In $KO_2$, the nature of oxygen species and the oxidation state of oxygen atom are, respectively :
Dead burnt plaster is
The INCORRECT statement is :
Magnesium reacts with an element $(X)$ to form an ionic compound. If the ground state electronic configuration of $( X )$ is $1 s ^{2} 2 s ^{2} 2 p ^{3}$, the simplest formula for this compound is
Which is least thermally stable?
Which of the following is most soluble in water?
Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect, is :
When $BaCl_2$ is added to an aqueous salt solution, a white precipitate is obtained. The anion among $CO_3^{ 2-}, SO_3^{ 2-}$ and $SO_4^{ 2-}$ that was present in the solution can be :
Plaster of Paris is represented as
Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field ?
Which of the following statements is not correct?
The main oxides formed on combustion of $Li, Na$ and $K$ in excess of air are, respectively :
The alkaline earth metal sulphate which is most soluble in water among the following is
Thomas slag is
$20.0 \,g$ of a magnesium carbonate sample decomposes on heating to give carbon dioxide and $8.0 \,g$ magnesium oxide. What will be the percentage purity of magnesium carbonate in the sample ?
On heating which of the following releases ${CO_2}$ most easily ?
Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?
The compound formed upon combustion of potassium metal in excess air is

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R

Assertion (A) : Sodium reacts with oxygen to form \(Na _{2} O _{2}\) but potassium reacts with oxygen to form \(KO _{2}\). 

Reason (R) : Potassium is more reactive metal than sodium.

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

Which of the following formulae is mismatched?
$ BeSO_4$ is soluble in water while $BaSO_4$ is not. Hydration energy decreases down the group from Be to Ba and lattice energy remains almost constant.
When a substance ' $A$ ' reacts with water, it produces a combustible gas ' $B$ ' and a solution of substance ' $C$ ' in water. while another substance ' $D$ ' reacts with solution of ' $C$ ' to produce the same gas $B$ on warming while ' $D$ ' can produce gas ' $B$ ' on reaction with dilute $H _{2} SO _{4}$ at room temperature. ' $A$ ' imparts a deep golden yellow colour to a smokeless flame on Bunsen burner. Identify 'A', $' B$ ', ' $C$ ' and ' $D$ ' respectively are
$KO _{2}$ (potassium superoxide) is used in oxygen cylinders in space and submarines because of it
The metallic lustre exhibited by sodium is due to