S-block elements practice · Mixed difficulty

Metallic hydride among the following is

Alkali metal superoxides are obtained by the reaction of

The yellow light for illumination of lamps is from:

A sudden large jump between the values of second and third ionization energies of an element would be associated with the electronic configuration:

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

The alkali metal that reacts with nitrogen directly to form nitride is

Assertion (A) : Lime water turns milky when the gas liberated from an acidified carbonate solution is passed into it.

Reason (R): The liberated $\mathrm{CO}_2$ reacts with lime water to give calcium bicarbonate as the precipitate.

Which of the following cations cannot be
detected by the flame test?

Element found in plant systems which forms an important constituent of photosynthesis is:

Brine is chemically:

The wire of flash bulbs are made up of:

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?

Which of the following is known as fusion mixture

A solution of KOH in water is called:

Flash bulbs contain wire or foil of Mg packed in an atmosphere of:

Minimum density in group-2 of periodic table is of

The most basic oxide among the following is:

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 soda is:

Baking powder is

When KI is added to acidified solution of sodium nitrite then

Sodium carbonate is:

The alkali metal which forms only the monoxide is

The metal that gives mainly a monoxide when heated in excess of ${O_2}$ 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