EASY

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On allowing ammonia solution of s-block metals to stand for a long time, blue colour becomes fade. The reason is:-

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Important Questions on The s-Block Elements

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

The metal that forms nitride by reacting directly with

N_{2}

of air is:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

Sodium metal on dissolution in liquid ammonia gives a deep blue solution due to the formation of:

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

Dihydrogen is liberated when water reacts with

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

Assertion (A):

K, Rb

and

Cs

form superoxides
Reason (R): The stability of superoxides increases form

K

Cs

due to decrease in lattice energy.

HARD

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

Which of the following liberates

O_{2}

upon hydrolysis?

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

A s-block element (M) reacts with oxygen to form an oxide of the formula

{MO}_{2}

. The oxide is pale yellow in colour and paramagnetic. The element

(M)

is:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

Sodium dissolves in liquid

{NH}_{3}

to give a deep blue solution. This is due to;

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

The number of alkali metal(s), from

Li, K, Cs, Rb

having ionization enthalpy greater than

400 kJ {mol}^{- 1}

and forming stable super oxide is

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

The oxide of potassium that does not exist is

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

The order of stability for the super oxides is

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

Which one of the following options is correct pertaining to the below transformations?

Na + {NH}_{3} (l) ⟶

Coloured solution

\overset{on standing}{⟶} X + Y

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

Name a nitrate that does not yield corresponding metal oxide, nitrogen dioxide on heating.

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

Identify the correct statements about alkali metals.

A. The order of standard reduction potential $(M^{+} | M)$ for alkali metal ions is $Na > Rb > Li$ .

B. $CsI$ is highly soluble in water.

C. Lithium carbonate is highly stable to heat.

D. Potassium dissolved in concentrated liquid ammonia is blue and paramagnetic.

E. All alkali metal hydrides are ionic solids.

Choose the correct answer from the options given below

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

Identify the weakest oxidizing agent among the following

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

Which one among the following metals is the weakest reducing agent?

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

The main oxides formed on combustion of Li, Na and K in excess of air are respectively:

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

The compound which does not exist is

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

When sodium

(Na)

metal is dissolved in liquid ammonia

({NH}_{3})

, it imparts a blue colour to the solution. This blue coloration is due to:

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

On combustion of

Li, Na

and

K

in excess of air, the major oxides formed, respectively, are:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Chemical Properties of Group 1 Elements

A metal on combustion in excess air forms

X

X

upon hydrolysis with water yields

H_{2} O_{2}

and

O_{2}

along with another product. The metal is:

On allowing ammonia solution of s-block metals to stand for a long time, blue colour becomes fade. The reason is:-

Important Questions on The s-Block Elements

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