The correct order of increasing thermal stability of K 2 CO 3 , MgCO 3 , CaCO 3 and BeCO 3 is :

BeCO 3 < MgCO 3 < CaCO 3 < K 2 CO 3

BeCO 3 < MgCO 3 < K 2 CO 3 < CaCO 3

MgCO 3 < BeCO 3 < CaCO 3 < K 2 CO 3

K 2 CO 3 < MgCO 3 < CaCO 3 < BeCO 3

Chemistry - Sblock Elements - Quiz-7

The correct order of the mobility of the alkali metal ions in aqueous solution is :

0%

$L i^{+} > N a^{+} > K^{+} > R b^{+}$
0%

$N a^{+} > K^{+} > R b^{+} > L i^{+}$
0%

$K^{+} > R b^{+} > N a^{+} > L i^{+}$
0%

$R b^{+} > K^{+} > N a^{+} > L i^{+}$

Alkali metals act as a :

0%

Good dehydrating agent.
0%

Good reducing agent.
0%

Good oxidising agent.
0%

None of the above.

The bleaching action of bleaching powder is due to the formation of :

0%

${OCl}^{-}$
0%

$O_{2}$
0%

${Cl}_{2}$
0%

${Cl}^{-}$

Crude sodium chloride obtained by crystallization of brine solution does not contain-

0%

$M g S O_{4}$
0%

$N a_{2} S O_{4}$
0%

$M g C l_{2}$
0%

$C a S O_{4}$

Which of the alkali metal choride (MCl) forms its dehydrate salt (MCl. $2 H_{2} O$ ) easily?

0%

LiCl
0%

CsCl
0%

RbCl
0%

KCl

The cation of alkali metals are found as M(H₂O)⁺_n in H₂O.

The value of 'n' is maximum for -

0%

Na⁺
0%

K⁺
0%

Rb⁺
0%

Li⁺

$∆ H_{solution}$ is positive for

I. LiF

II. CsI

III. RbF

IV. KF

0%

I, II, III & IV
0%

II only
0%

I only
0%

I & II only

Gypsum on heating can change to :

0%

Orthorhombic form.
0%

Plaster of paris.
0%

Dead plaster.
0%

All of the above.

The fire extinguisher contains NaHCO₃ and the compound (X). The compound (X) maybe -

0%

CH₃COOH
0%

NaOH
0%

C₆H₅OH
0%

None of the above.

All group-2 metals dissolve in liquid ammonia to produce a bright blue colour. The colour is due to-

0%

A change in the structure of ammonia.
0%

d-d transition.
0%

The spectrum of the solvated electrons.
0%

An electronic transition from a lower to a higher energy state.

A substance that gives a brick red flame and breaks down on heating giving oxygen and a brown gas is-

0%

Calcium carbonate.
0%

Magnesium carbonate.
0%

Magnesium nitrate.
0%

Calcium nitrate.

A: Alkali metals can be extracted by chemical reduction

R: Alkali metals are weak reductants.

0%

Both Assertion & Reason are true and the reason is the correct explanation of the assertion.
0%

Both Assertion & Reason are true but the reason is not the correct explanation of the assertion.
0%

Assertion is a true statement but Reason is false.
0%

Both Assertion and Reason are false statements.

${({NH}_{4})}_{2} {Cr}_{2} O_{7}$ on heating (below 200 degrees celsius) liberates a gas. The same gas will be obtained below 600 degrees celsius by :

0%

Heating ${NH}_{4} {NO}_{2}$
0%

Heating ${NH}_{4} {NO}_{3}$
0%

Heating ${Mg}_{3} N_{2}$
0%

None of the above

A Brine solution on electrolysis will not give :

0%

NaOH
0%

${Cl}_{2}$
0%

$H_{2}$
0%

$O_{2}$

Out of Be, Mg, Ca, Sr and Ba,

Total number of metal whose nitrates are decomposed according to the following reaction are:

2M(NO₃)₂ $\overset{∆}{\to}$ Residue + 4NO₂+ O₂

0%

5
0%

4
0%

3
0%

2

The sequence of ionic mobility in aqueous solution is :

0%

K⁺> Na⁺> Rb⁺> Cs⁺
0%

Cs⁺> Rb⁺> K⁺> Na⁺
0%

Rb⁺> K⁺> Cs⁺> Na⁺
0%

Na⁺> K⁺> Rb⁺> Cs⁺

An amphoteric hydroxide among the following is :

0%

$Be {(OH)}_{2}$
0%

$Sr {(OH)}_{2}$
0%

$Ca {(OH)}_{2}$
0%

$Mg {(OH)}_{2}$

The correct order of increasing thermal stability of K₂CO₃, MgCO₃, CaCO₃ and BeCO₃ is :

0%

${BeCO}_{3} < {MgCO}_{3} < K_{2} {CO}_{3} < {CaCO}_{3}$
0%

${BeCO}_{3} < {MgCO}_{3} < {CaCO}_{3} < K_{2} {CO}_{3}$
0%

${MgCO}_{3} < {BeCO}_{3} < {CaCO}_{3} < K_{2} {CO}_{3}$
0%

$K_{2} {CO}_{3} < {MgCO}_{3} < {CaCO}_{3} < {BeCO}_{3}$

HCl was passed through a solution of CaCl₂, MgCl₂, and NaCl. Compound(s) that get crystallize is/are-

0%

Only NaCl
0%

Only MgCl₂
0%

NaCl, MgCl₂, and CaCl₂
0%

Both MgCl₂ and CaCl₂

The incorrect statement among the following is-

0%

Sodium metal is used in organic qualitative analysis.
0%

Sodium carbonate is soluble in water and it is used in inorganic qualitative analysis.
0%

Potassium carbonate can be prepared by the solvay process.
0%

Aq. solution of potassium bicarbonate is a weak base.

Lithium shows a diagonal relationship with :

0%

Sodium
0%

Magnesium
0%

Calcium
0%

Aluminium

In case of alkali metal halides, the ionic character increases in the order :

0%

MF < MCl < MBr < MI
0%

MI < MBr < MCl < MF
0%

MI < MBr < MF < MCl
0%

None of the above.

A molecule among the following that has the highest hydration energy is -

0%

MgCl₂
0%

CaCl₂
0%

BaCl₂
0%

SrCl₂

The compound (X) on heating gives a colorless gas and a residue that is dissolved
in water to obtain (B). Excess of CO $_{2}$ is bubbled through an aqueous solution of B, C is
formed. Solid (C) on heating gives back X. (B) is

0%

CaCO $_{3}$
0%

Ca(OH) $_{2}$
0%

Na $_{2}$ CO $_{3}$
0%

NaHCO $_{3}$

Among the following the least thermally stable carbonate is :

0%

$1 . K_{2} {CO}_{3}$
0%

${Na}_{2} {CO}_{3}$
0%

${BaCO}_{3}$
0%

${Li}_{2} {CO}_{3}$

One mole of calcium phosphide upon reacting with water gives:

0%

One mole of the phosphene.
0%

Two moles of phosphoric acid.
0%

Two moles of phosphine.
0%

One mole of phosphorus pentaoxide.

Which of these is not used as fuel in the rocket propellants?

0%

Liquid He
0%

Liquid hydrogen
0%

Kerosene
0%

Liquid hydrazine

Fire extinguishers contain $H_{2} S O_{4}$ and __ _

0%

${NaHCO}_{3}$ and ${Na}_{2} {Co}_{3}$
0%

${NaHCO}_{3}$ solution
0%

${Na}_{2} {Co}_{3}$
0%

${CaCO}_{3}$

Sodium nitrate decomposes above 800°C and does not give:

0%

$N_{2}$
0%

$O_{2}$
0%

${NO}_{2}$
0%

Na₂O

On heating sodium metal in a current of dry ammonia gas the compound formed is:

0%

sodium nitrate
0%

sodium hydride
0%

sodium amide
0%

sodium azide

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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