S-block elements practice · Medium

Assertion: $s$-Block elements do not occur free in nature.

Reason: $s$-Block elements are highly electropositive in nature.

One of the elements present in carnallite shows flame colouration. The colour of the flame is

Which of the following sulphates have the highest solubility in water?

Select the correct statement among the following

Which of the following reaction does not liberate gaseous product?

Salt with which one of the following cation produce yellow colour precipitate with potassium chromate

Which represents nitrolime?

s-block element which cannot be qualitatively confirmed by the flame test is

Hypo is used in:

The electrolyte employed in the extraction of sodium by Down’s electrolysis method is:

In the following reaction,

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

Number of elements which give flame test from following

$\mathrm{Sr}, \mathrm{Cu}, \mathrm{Co}, \mathrm{Ca}, \mathrm{Ni}, \mathrm{Fe}$

Which is not correctly matched?

(1) Basic strength of oxides:

${Cs}_2{O} < {Rb}_2{O} < {K}_2{O} < {Na}_2{O} < {Li}_2{O}$

(2) Stability of peroxides:

${Na}_2{O}_2 < {K}_2{O}_2 < {Rb}_2{O}_2 < {Cs}_2{O}_2$

(3) Stability of bicarbonates:

${LiHCO}_3 < {NaHCO}_3 < {KHCO}_3 < {RbHCO}_3 < {CsHCO}_3$

(4) Melting point : ${NaF} < {NaCl} < {NaBr} < {NaI}$

What are the metal ions present in carnallite?

The yellow light for illumination of lamps is from:

An allylide on hydrolysis gives allylene. The alkaline the earth metal cation of allyhide dissolves in dry ether in the presence of alkyl halide to form Grignard reagent. The allylide is

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

Assertion A: The alkali metals and their salts
impart characteristic colour to reducing flame.

Reason R: Alkali metals can be detected using
flame tests.

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

Assertion (A): ${LiCl}$ and ${MgCl}_2$ are soluble in ethanol.

Reason (R): Lithium and magnesium are harder than their respective group elements The correct option among the following is

Which of the following compound is used in fire extinguishers?

A solution of KOH in water is called:

Minimum density in group-2 of periodic table is of

Which of the following elements gives violet colour to the oxidising flame?

$\mathrm {Li}$ has the maximum value of ionisation potential among alkali metals i.e. lithium has the minimum tendency to ionise to give $\mathrm{Li}^{+}$ion. Thus, in aq. solution lithium is

Choose the correct statement(s) among the following

(I) ${LiF}$ is more soluble than ${LiClO}_4$ in water.

(II) The standard reduction potential $\left[{E}^{\circ}\right]$ of ${Li}$ is more negative than that of ${Na}$.

(III) The heat of hydration of ${Li}^{+}({g})$ is greater than that of ${Na}^{+}({g})$.

Baking powder is

When KI is added to acidified solution of sodium nitrite then

Sodium carbonate is:

Assertion: Best diagonal relationship is shown between $Be$ and $Al$.

Reason: Ionization energy of $Be$ is almost the same as that of $Al$.

Which is most easily soluble in water

Which of the following strongest reducing agent in aqueous solution