Alkali Metals

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JEE Advanced 2020

Which of the following liberates $O_{2}$ upon hydrolysis?

Pb_{3} O_{4}

(B)

KO_{2}

(C)

Na_{2} O_{2}

(D)

Li_{2} O_{2}

JEE Advanced 2014

LEVELJEE Advanced

The pair(s) of reagents that yield paramagnetic species is / are :

* Multiple Correct Options

(A)

Na and excess of

NH_{3}

(B)

K and excess of

O_{2}

(C)

Cu and dilute

HNO_{3}

(D)

O_{2}

and 2-ethylanthraquinol

JEE Main 2021

LEVELJEE Main

Match List I with List II. $List I A. Li B. Na C. K D. Cs List II I. Photoelectric cell II. Absorbent of CO_{2} III. Coolant in fast breeder nuclear reactor IV. Treatment of cancer V. Bearings for motor engines$ Choose the correct answer from the options given below.

(A)

\to

V, B

\to

I, C

\to

II, D

\to

(B)

\to

V, B

\to

II, C

\to

IV, D

\to

(C)

\to

IV, B

\to

III, C

\to

I, D

\to

(D)

\to

V, B

\to

III, C

\to

II, D

\to

JEE Main 2021

LEVELJEE Main

Find $A$ , $B$ and $C$ in the following reactions: $N H_{3} + A + C O_{2} ⟶ (N H_{4})_{2} C O_{3}$ $(N H_{4})_{2} C O_{3} + H_{2} O + B ⟶ N H_{4} H C O_{3}$ $N H_{4} H C O_{3} + N a C l ⟶ N H_{4} C l + C$

(A)

A - O_{2}, B - C O_{2}, C - N a_{2} C O_{3}

(B)

A - H_{2} O, B - O_{2}, C - N a_{2} C O_{3}

(C)

A - H_{2} O, B - O_{2}, C - N a H C O_{3}

(D)

A - H_{2} O, B - C O_{2}, C - N a H C O_{3}

JEE Main 2021

LEVELJEE Main

Match List-I with List-II. $List-I A. Sodium carbonate B. Titanium C. Chlorine D. Sodium hydroxide List-II (i) Deacon (ii) Castner-Kellner (iii) van-Arkel (iv) Solvay$ Choose the correct answer form the options given below.

(A)

A-(iv), B-(iii), C-(i), D-(ii)

(B)

A-(i), B-(iii), C-(iv), D-(ii)

(C)

A-(iv), B-(i), C-(ii), D-(iii)

(D)

A-(iii), B-(ii), C-(i), D-(iv)

LEVELJEE Main

The ionic mobility of alkali metal ions in aqueous soluton is maximum for

(A)

K^{+}

(B)

R b^{+}

(C)

L i^{+}

(D)

N a^{+}

JEE Main 2021

LEVELJEE Advanced

Choose the correct statement from the following.

(A)

The standard enthalpy of formation for alkali metal bromide becomes less negative on descending the group.

(B)

The low solubility of CsI in water is due to its high lattice enthalpy.

(C)

Among the alkali metal halides, LiF is least soluble in water.

(D)

LiF has least negative standard enthalpy of formation among alkali metal fluorides.

JEE Main 2021

LEVELJEE Main

Match List-I with List-II. \begin{array}{ll} \textbf{List-I (Salt)} & \textbf{List-II (Flame colour wavelength)} \\ \text{A. LiCl} & \text{1. } 455.5 \text{ nm} \\ \text{B. NaCl} & \text{2. } 670.8 \text{ nm} \\ \text{C. RbCl} & \text{3. } 780.0 \text{ nm} \\ \text{D. CsCl} & \text{4. } 589.2 \text{ nm} \end{array} Choose the correct answer from the options given below.

(A)

\to

4, B

\to

2, C

\to

3, D

\to

(B)

\to

2, B

\to

1, C

\to

4, D

\to

(C)

\to

1, B

\to

4, C

\to

2, D

\to

(D)

\to

2, B

\to

4, C

\to

3, D

\to

JEE Main 2019

LEVELJEE Main

The correct order of hydration enthalpies of alkali metal ions is

(A)

Li^{+} > Na^{+} > K^{+} > Cs^{+} > Rb^{+}

(B)

Na^{+} > Li^{+} > K^{+} > Rb^{+} > Cs^{+}

(C)

Na^{+} > Li^{+} > K^{+} > Cs^{+} > Rb^{+}

(D)

Li^{+} > Na^{+} > K^{+} > Rb^{+} > Cs^{+}

JEE Main 2020

LEVELJEE Main

The metal mainly used in devising photoelectric cells is

Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect is

(A)

Both form basic carbonates

(B)

Both form soluble bicarbonates

(C)

Both form nitrides

(D)

nitrates of both Li and Mg yield

NO_{2}

and

O_{2}

on heating

LEVELJEE Main

$KO_{2}$ is used in space and submarines because it

(A)

absorbs

CO_{2}

and increases

O_{2}

CO_{2}

Among the statements (A)-(D), the correct ones are (A) lithium has the highest hydration enthalpy among alkali metals. (B) lithium chloride is insoluble in pyridine. (C) lithium cannot form ethynide upon its reaction with ethyne. (D) Both lithium and magnesium react slowly with $H_{2} O$ .

(A), (C) and (D) only

(D)

(A), (B) and (D) only

LEVELJEE Main

Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point ?

The metallic sodium dissolves in liquid ammonia to form a deep blue coloured solution. The deep blue colour is due to the formation of

(A)

solvated electron

e^{-} (N H_{3})_{x}

(B)

solvated atomic sodium,

N a (N H_{3})_{y}

(C)

(N a^{+} + N a^{-})

(D)

N a N H_{2} + H_{2}

JEE Main 2021

LEVELJEE Main

The correct set from the following in which both pairs are in correct order of melting point is

(A)

LiF > LiCl, MgO > NaCl

(B)

LiCl > LiF, NaCl > MgO

(C)

LiF > LiCl, NaCl > MgO

(D)

LiCl > LiF, MgO > NaCl

JEE Main 2021

LEVELJEE Main

Match List I with List II. Choose the correct answer from the options given below.

List-I

(P)

Li

(Q)

Na

(R)

K

(S)

Cs

List-II

(1)

Poor water solubility of

I^{-}

salt

(2)

Most abundant element in cell fluid

(3)

Bicarbonate salt used in fire extinguisher

(4)

Carbonate salt decomposes easily on heating

JEE Main 2021

LEVELJEE Main

Match List-I with List-II. $List-I A. NaOH B. Be(OH)_{2} C. Ca(OH)_{2} D. B(OH)_{3} E. Al(OH)_{3} List-II I. Acidic II. Basic III. Amphoteric$ Choose the most appropriate answer from the options given below.

(A)

\to

II, B

\to

II, C

\to

III, D

\to

II, E

\to

III

(B)

\to

II, B

\to

III, C

\to

II, D

\to

I, E

\to

III

(C)

\to

II, B

\to

II, C

\to

III, D

\to

I, E

\to

III

(D)

\to

II, B

\to

I, C

\to

II, D

\to

III, E

\to

III

JEE Main 2020

LEVELJEE Main

Reaction of an inorganic sulphite X with dilute $H_{2} SO_{4}$ generates compound Y. Reaction of Y with NaOH gives X. Further, the reaction of X with Y and water affords compound Z. Y and Z respectively, are

(A)

SO_{2}

and

Na_{2} SO_{3}

(B)

SO_{3}

and

NaHSO_{3}

(C)

SO_{2}

and

NaHSO_{3}

(D)

S and

Na_{2} SO_{3}

JEE Main 2019

LEVELJEE Main

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

(A)

sodium ammonia complex

(B)

sodium ion-ammonia complex

Match List I with List II. \begin{array}{ll} \text{List-I (Elements)} & \text{List-II (Properties)} \\ \text{A. Ba} & \text{(i) Organic solvent soluble compounds} \\ \text{B. Ca} & \text{(ii) Outer electronic configuration } 6s^2 \\ \text{C. Li} & \text{(iii) Oxalate insoluble in water} \\ \text{D. Na} & \text{(iv) Formation of very strong monoacidic base} \end{array} Choose the correct answer from the options given below

(A)

A-(ii), B-(iii), C-(i), D-(iv)

(B)

A-(iv), B-(i), C-(ii), D-(iii)

(C)

A-(iii), B-(ii), C-(iv), D-(i)

(D)

A-(i), B-(iv), C-(ii), D-(iii)

JEE Main 2011

LEVELJEE Main

What is the best description of the change that occurs when $Na_{2} O (s)$ is dissolved in water?

(A)

Oxidation number of sodium decreases

(B)

Oxide ion accepts a shared pair of electrons

(C)

Oxide ion donates a pair of electrons

(D)

Oxidation number of oxygen increases

JEE Main 2021

LEVELJEE Main

One of the by-products formed during the recovery of $NH_{3}$ from solvay process is

(A)

Ca(OH)_{2}

(B)

NaHCO_{3}

(C)

CaCl_{2}

(D)

NH_{4} Cl

JEE Main 2021

LEVELJEE Main

Given below are two statements. One is labelled as Assertion A and the other labelled as Reason R. Assertion A Lithium halides are some what covalent in nature. Reason R Lithium possess high polarisation capability. According the above statements, choose the most appropriate answer from the options given below

(A)

A is true but R is false

(B)

A is false but R is true

(C)

Both A and R are true but R is not the correct explanation of A

(D)

Both A and R are true and R is the correct explanation of A

JEE Main 2020

LEVELJEE Main

Two elements $A$ and $B$ have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. $A$ and $B$ , respectively, are

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Which of the following liberates O2​ upon hydrolysis?

The pair(s) of reagents that yield paramagnetic species is / are :

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Find A, B and C in the following reactions: NH3​+A+CO2​⟶(NH4​)2​CO3​ (NH4​)2​CO3​+H2​O+B⟶NH4​HCO3​ NH4​HCO3​+NaCl⟶NH4​Cl+C

The ionic mobility of alkali metal ions in aqueous soluton is maximum for

Choose the correct statement from the following.

The correct order of hydration enthalpies of alkali metal ions is

The metal mainly used in devising photoelectric cells is

Both lithium and magnesium display several similar properties due to the diagonal relationship; however, the one which is incorrect is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } KO2​ is used in space and submarines because it

Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point ?

The metallic sodium dissolves in liquid ammonia to form a deep blue coloured solution. The deep blue colour is due to the formation of

The correct set from the following in which both pairs are in correct order of melting point is

Match List I with List II. Choose the correct answer from the options given below.

List-I

List-II

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

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } What is the best description of the change that occurs when Na2​O(s) is dissolved in water?

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } One of the by-products formed during the recovery of NH3​ from solvay process is

.math-text-wrapper .katex { font-size: 1.05em !important; } .math-text-wrapper .katex-display { margin: 1rem 0 !important; } Two elements A and B have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. A and B, respectively, are

Which of the following liberates $O_{2}$ upon hydrolysis?

Find $A$ , $B$ and $C$ in the following reactions: $N H_{3} + A + C O_{2} ⟶ (N H_{4})_{2} C O_{3}$ $(N H_{4})_{2} C O_{3} + H_{2} O + B ⟶ N H_{4} H C O_{3}$ $N H_{4} H C O_{3} + N a C l ⟶ N H_{4} C l + C$

$KO_{2}$ is used in space and submarines because it

What is the best description of the change that occurs when $Na_{2} O (s)$ is dissolved in water?

One of the by-products formed during the recovery of $NH_{3}$ from solvay process is

Two elements $A$ and $B$ have similar chemical properties. They don't form solid hydrogencarbonates, but react with nitrogen to form nitrides. $A$ and $B$ , respectively, are