Chemistry - Sblock Elements - Quiz-4

Which of the following acts as an oxidizing as well as a reducing agent?

0%

${Na}_{2} O$
0%

${NaO}_{3}$
0%

$NaNO$
0%

${NaNO}_{2}$

Alkaline earth metal nitrates on heating decompose to give:

0%

$M {({NO}_{2})}_{2} and O_{2} only$
0%

$MO, N_{2} and O_{2}$
0%

$MO, {NO}_{2} and O_{2}$
0%

$MO and {NO}_{2} only$

Consider the following statements and pick out the correct one.

(1) The solubility, thermal stability, and the basic character of the hydroxides of alkaline earth

metals increases from $Mg {(OH)}_{2} to Ba {(OH)}_{2} .$

(2) The dehydration of hydrated chlorides, bromides, bromides and iodides of Ca, Sr and Ba can be

achieved on heating.

Lewis acids.

(3) The chlorides of both beryllium and aluminium are soluble in organic solvents and are strong

0%

(1) and (2) only
0%

(1) and (3) only
0%

(1), (2) and (3)
0%

none

A metal [X] heating on nitrogen gas gives [Y]. [Y] on treatment with $H_{2} O$ gives a colourless gas which when passed through ${CuSO}_{4}$ solution gives a blue colour. [Y] is-

0%

$MgO$
0%

$Mg {({NO}_{3})}_{2}$
0%

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

${NaN}_{3}$

Assertion : Beryllium resembles aluminium.

Reason : : Charge / radius of $B e^{2 +}$ ion is nearly the same as that of the $A l^{3 +}$ ion.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

0%
1
0%
2
0%
3
0%
4

Assertion : As the electropositive character increases down the group, the stability of carbonates and hydrogen carbonates of alkali metals increases.

Reason : Lithium carbonates is not so stable to heat ; lithium being very small in size polarizes a large $C O_{3}^{2 -}$ ion leading to the formation of more stable $L i_{2} O$ and $C O_{2}$ .

If both the assertion and the reason are true and the reason is a correct explanation of the assertion
If both the assertion and reason are true but the reason is not a correct explanation of the assertion
If the assertion is true but the reason is false
If both the assertion and reason are false

0%
1
0%
2
0%
3
0%
4

The following is the correct order of chemical reactivity with water according to electrochemical series-

0%

K>Mg>Cu>Zn
0%

K>Mg>Zn>Cu
0%

Cu>Zn>K>Mg
0%

Mg>K>Cu>Zn

In the reaction $M + O_{2} \to {MO}_{2}$ (superoxide) the metal is -

0%

Li
0%

Na
0%

K
0%

Ba

The reaction of sodium with water is highly exothermic. The rate of reaction can be lowered by-

0%

Decreasing the temperature
0%

Mixing with alcohol
0%

Mixing with acetic acid
0%

Making an amalgam

Sodium reacts with water less vigorously than potassium because-

0%

It has a higher atomic weight.
0%

It is less electropositive .
0%

It is more electronegative.
0%

It is a metal .

The correct relation about the density of Na and K is

0%

Na > K
0%

Na = K
0%

K > Na
0%

Li > K

Which of the following does not give an oxide on heating-

0%

$M g C O_{3}$
0%

$L i_{2} C O_{3}$
0%

$Z n C O_{3}$
0%

$K_{2} C O_{3}$

The reason for a lower basicity of hydroxides of alkaline earth metals than alkali metals is :

0%

Alkali metals form ionic compounds.
0%

The bond strength of oxygen is more for alkali metals.
0%

The electropositivity of alkali metals is more than alkaline earth metals.
0%

The electropositivity of alkali metals is less than alkaline earth metals.

In $K^{+} F^{-}$ ionic radius of $F^{-}$ is more while atomic radius of $K^{+}$ is –

0%

Less than $F^{-}$
0%

More than $F^{-}$
0%

Equal to $F^{-}$
0%

None of these

Lattice energy is lowest for –

0%

LiF
0%

NaCl
0%

KBr
0%

CsI

MgO is a-

0%

Acidic oxide
0%

Basic oxide
0%

Neutral oxide
0%

Amphoteric oxide

Which of the following statements is wrong ?

0%

Lithium nitrate on heating gives lithium nitrite and $O_{2}$ .
0%

Sodium oxide, $N a_{2} O$ is obtained on heating sodium azide with sodium nitrite.
0%

Potassium cyanide dissolves silver in presence of air or $O_{2}$ .
0%

Potassium formate is formed when moist $C O_{2}$ reacts with potassium hydride.

Ionic conductances of hydrated M+ ions are in the order-

0%

$L i^{+} (a q) > N a^{+} (a q) > K^{+} (a q) > R b^{+} (a q) > C s^{+} (a q)$
0%

$L i^{+} (a q) > N a^{+} (a q) < K^{+} (a q) < R b^{+} (a q) < C s^{+} (a q)$
0%

$L i^{+} (a q) > N a^{+} (a q) > K^{+} (a q) > R b^{+} (a q) < C s^{+} (a q)$
0%

$L i^{+} (a q) < N a^{+} (a q) < K^{+} (a q) < R b^{+} (a q) < C s^{+} (a q)$

Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is –

0%

PbO, $F e_{3} O_{4}$
0%

CaO, $K_{2} O$
0%

$C u_{2} O, S n O_{2}$
0%

$F e_{2} O_{3}, Z n O$

The number of crystal water in Gypsum, Plaster of Paris and Epsom salt respectively are-

0%

2, 0.5, 7
0%

7, 2, 1
0%

7, 0.5, 2
0%

3, 4, 2

Which of the following statement is false regarding saline hydrides –

0%

They conduct electricity in molten state
0%

They dissolve in water and liberate $H_{2}$
0%

They are used as reducing agents
0%

They are covalent in nature

An amphoteric oxide among the following is-

0%

CaO
0%

SrO
0%

BeO
0%

MgO

The incorrect statement among the following regarding Lithium is that-

0%

The hydroxide, carbonate and nitrate decompose to give the oxide on heating.
0%

It is the most electronegative element of group IA.
0%

The hydrogen carbonate cannot be isolated as a stable solid.
0%

It forms superoxide.

Which one of the following is most stable in ether-

0%

$B e C l_{2}$
0%

$C a C l_{2}$
0%

$S r C l_{2}$
0%

None of these

The strongest reducing agent is-

0%

Be
0%

Mg
0%

Sr
0%

Ba

The largest value of $K_{sp}$ among the following is -

0%

${BeSO}_{4}$
0%

${MgSO}_{4}$
0%

${CaSO}_{4}$
0%

${BaSO}_{4}$

What are $α$ , $β$ and $γ$ in the following equation

$α K_{4} [F e {(C N)}_{6}] + β K_{2} C O_{3} + γ S \overset{h e a t}{\to}$ Products ?

the products are Fe, $C O_{2},$ KCNO and KSCN.

0%

() 1, 2, 3
0%

() 2, 1, 5
0%

() 1, 1, 5
0%

() 2, 2, 3

The correct order of increasing ionic character is –

0%

$B e C l_{2} < B a C l_{2} < M g C l < C a C l_{2}$
0%

$B e C l_{2} < M g C l_{2} < C a C l_{2} < B a C l_{2}$
0%

$B e C l_{2} < M g C l_{2} < B a C l_{2} < C a C l_{2}$
0%

$B a C l_{2} < C a C l_{2} < M g C l_{2} < B e C l_{2}$

The polarising power of Mg is close to that of –

0%

Na
0%

Cs
0%

Li
0%

K

Sodium metal cannot be stored under-

0%

Benzene
0%

Kerosene
0%

Alcohol
0%

Toluene

0:0:1

Practice Chemistry Quiz Questions and Answers

0:0:1

Practice Chemistry Quiz Questions and Answers

Support mcqexams.com by disabling your adblocker.