List of top Chemistry Questions on GROUP 1 ELEMENTS

The melting and boiling points of the alkali metals are low. Alkali metals have weak metallic bonding.

Superoxides of alkali metals are paramagnetic. Superoxides contain $O_2^-$ ion which has one unpaired electron.

Lithium salts are mostly hydrated. The hydration enthalpies of alkali metal ions decrease with increase in ionic sizes.

An aqueous solution of sodium carbonate is' alkaline because sodium carbonate is a salt of

Alkali metals in each period have

Alkaline earth metals form dipositive ions instead of unipositive ions because

Alkali metal halides except Li are soluble in water showing that they are

Alkali metals are not found in free state due to their highly reactive nature. This is due to

A suspension of $Ca(OH)_2$ in water is called

A solution of a compound $X$ in dilute $HCl$ on treatment with a solution of $BaCl_2$ gives a white precipitate of a compound $Y$ which is insoluble in cone. $HNO_3$ and conc. $HCl$. Compound $X$ imparts golden yellow colour to the flame. $\underset{\text{(imparts golden yellow colour)}}{ {X (Solution \,in \,dilute HCl) }}$ $+\, {BaCl2 -> }$$\underset{\text{Whit ppt}}{ {Y}}$ $ {->[\text{Conc}. HNO_3][\text{Conc}.HCl] Insoluble}$ What are compounds $X$ and $Y$ ?

A metal $M$ readily forms its sulphate $MSO_4$ which is water soluble. It forms its oxide $MO$ which becomes inert on heating. It forms its insoluble hydroxide $M(OH)_2$ which is soluble in $NaOH$ solution. What would be $M$ ?

A combustible gas is liberated when caustic soda solution is heated with

A chemical $'A?$ is used for the preparation of washing soda to recover ammonia. When $CO_2$ is bubbled through an aqueous solution of $'A?$, the solution turns milky. It is used in white washing due to disinfectant nature. What is the chemical formula of $'A'$ ?

A certain compound $X$ imparts a golden yellow flame. When zinc powder is heated with concentrated solution of $X$, $H_2$ gas is evolved. $X$ combines with $CO_2$ to give a salt $Y$. $Y$ is a hydrated salt which on reaction with $HCl$ or excess of $CO_2$ gives another salt $Z$ which is an important part of baking powder. Identify $X$, $Y$ and $Z$.

Electronic configuration of $Na$ is

When potassium is reacted with water, which compound $(S)$ is are formed preferentially?

The alkaline earth metal with the least density value is