EASY

Earn 100

Explain the oxidation states of alkali metals.

Important Questions on The s-Block Elements

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

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:

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

The metal that forms nitride by reacting directly with

N_{2}

of air is:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

Magnesium is burnt in the air to form

A

and

B

. When

B

is hydrolyzed,

C

and

D

are formed.

D

is the reactant in the manufacture of nitric acid by Ostwald's process. What is

C

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

Dihydrogen is liberated when water reacts with

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

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

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

Sodium dissolves in liquid

{NH}_{3}

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

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

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:

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

A metal

' M'

readily gives

{MSO}_{4},

which is soluble in water. It forms its oxide

M 0

which is amphoteric. It forms an insoluble hydroxide

M (OH)_{2},

which is soluble in

NaOH

solution. The

M

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

On combustion of

Li, Na

and

K

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

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

The oxide of potassium that does not exist is

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

A piece of

Mg

ribbon is heated to redness in nitrogen atmosphere and the treated with water. The gas evolved is

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

Magnesium powder burns in air to give

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

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:

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

The element whose salts cannot be detected by flame test is.

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

Assertion (A):

K, Rb

and

Cs

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

K

Cs

due to decrease in lattice energy.

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

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

Na + {NH}_{3} (l) ⟶

Coloured solution

\overset{on standing}{⟶} X + Y

HARD

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

Powdered Beryllium burns in air to give

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

The order of stability for the super oxides is

MEDIUM

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

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

EASY

Chemistry>Inorganic Chemistry>The s-Block Elements>Group 1 Elements: Alkali Metals

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

Explain the oxidation states of alkali metals.

Important Questions on The s-Block Elements

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