S-block elements practice · Mixed difficulty

Sodium metabisulphite is not:

Which of the following is commercially known as oxone ?

Select the correct statement among the following

A certain compound(X) when treated with copper sulphate solution yields a brown precipitate. On adding hypo solution, the precipitate turns white. The compound is

The element with strong electropositive nature is:

Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) Barium carbonate is insoluble in water and is highly stable.
Reason (R) The thermal stability of the carbonates increases with increasing cationic size.

$\mathrm{N}{\mathrm{a}_2}\mathrm{C}{\mathrm{O}_3}$ can be manufactured by Solvay process but ${\mathrm{K}_2}\mathrm{C}{\mathrm{O}_3}$ cannot be prepared because:

When $Ca{C_2}$ reacts with ${H_2}O$ then, it gives

Which of the following statements are correct for alkali metal compounds?
Superoxides are paramagnetic in nature.
The basic strength of hydroxides increases down the group.
The conductivity of chlorides in their aqueous solutions decreases down the group.
The basic nature of carbonates in aqueous solutions is due to cationic hydrolysis.

A white solid reacts with dil. $\mathrm{HCl}$ to give colourless gas that decolourises aqueous bromine. The solid is most likely to be:

Be Shows diagonal relationship with $Al$. Which of the following similarity incorrect?

The correct order of density of following elements is :- (Be, Mg, Ca, Sr)

For which one of the following minerals, the composition given is incorrect?

Which is most basic in character?

KI and $\mathrm{CuS}{\mathrm{O}_4}$ solution when mixed, give

Which of the following statements is correct for $\mathrm{CsB}{\mathrm{r}_3}$ ?

Acidified solution of sodium thiosulphate is unstable because in thiosulphate:

Which pair cannot exist together in solution?

A metal carbonate is sparingly soluble in water and evolves $\mathrm{C}{\mathrm{O}_2}$ on heating. The metal is:

The characteristic colour exhibited by Rb atom to an oxidizing flame is

Which of the following compounds on reaction with $\mathrm{NaOH}$ and ${\mathrm{H}_2}{\mathrm{O}_2}$ gives yellow colour?

In the following reaction,

$\mathrm{NaOH} + \mathrm{S} \to A + \mathrm{N}{\mathrm{a}_2}\mathrm{S} + {\mathrm{H}_2}\mathrm{O};A\mathrm{is}$

One mole of magnesium nitride on the reaction with an excess of water gives

$Mg\xrightarrow[{{\text{Heat}}}]{{{\text{Air}}}}X + Y\xrightarrow{{{H_2}O}}Z\xrightarrow{{{H_2}O}}{\text{solution}}\xrightarrow{{CuS{O_4}}}A$
Blue coloured solution, substances $X,\,\,Y,\,\,\,Z$ and $A$ are respectively.

A metal $M$ forms water soluble $M\mathrm{S}{\mathrm{O}_4}$ and inert $MO.MO$ in aqueous solution forms insoluble $M{\left( {\mathrm{OH}} \right)_2}$ soluble in NaOH. Metal $M$ is

Carnallite is

Which substance gives a different flame colouration from the others?

$\mathrm{N}{\mathrm{a}_2}\mathrm{S}{\mathrm{O}_3}$ and $\mathrm{NaHC}{\mathrm{O}_3}$ may be distinguished by treating their aqueous solution with:

Electric cookers have a coating of ….that protects them against fire.

The compound $X$ on heating gives a colourless gas. The residue is dissolved in water to obtain $Y$ . Excess $\mathrm{C}{\mathrm{O}_2}$ is bubbled through aqueous solution of $Y,Z$ is formed. $Z$ on gentle heating gives back $X$ . The compound $X$ is: