Hl cannot be prepared by the action of Kl and H 2 SO 4 because -

Hl gets oxidized by H 2 SO 4 to form l 2

Hl is a much weaker acid than H 2 SO 4

H 2 SO 4 is a dehydrating reagent.

Hl is less volatile than H 2 SO 4

Chemistry - Pblock Elements Xii - Quiz-4

Which of the following noble gas does not form clathrate compound?

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(a) Kr
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$() Ne$
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$(c) Xe$
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$() Ar$

Correct order of bond angle in given species is :

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(a) SiO44->PCl3>NCl3>SbH3>H2Te
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$() {SiO}_{4}^{4 -} > {NCl}_{3} > {PCl}_{3} > {SbH}_{3} > H_{2} Te$
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$(c) {SiO}_{4}^{4 -} > H_{2} Te > {SbH}_{3} > {PCl}_{3} > {NCl}_{3}$
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$() {NCl}_{3} > {PCl}_{3} > {SiO}_{4}^{4 -} > {SbH}_{3} > H_{2} Te$

The incorrect order is:

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(a) N>P>As : Strength of π‐bond with oxygen atom
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$() {SiF}_{4} > {SiCl}_{4} > {SiBr}_{4} > {Sil}_{4} : Thermal stability$
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$(c) H_{2} S > H_{2} Se > H_{2} Te : Arrhenious acid character$
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$() {CaBr}_{2} > {MgBr}_{2} > {BeBr}_{2} : Melting point$

Among the following cyclic species are :

$(I) H_{5} P_{3} O_{10} (II) {[B_{3} O_{3} {(OH)}_{5}]}^{2 -} (III) H_{5} P_{5} O_{15} (IV) P_{3} N_{3} {Cl}_{6}$

$(a) I, III$

$(b) I, III, IV$

$(c) II, III, IV$

$(d) I, II, III, IV$

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$H C N + H_{2} O \to [X] + N H_{3}$

$[X] \overset{∆}{\to} [Y] + H_{2} O$

(Unbalanced equations)

[Y] May be prepared by which one of the following methods?

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[A] By dehydrtion of malonic acid with $P_{2} O_{5}$
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[B] By thermal decomposition of caron sub-oxide in air.
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[C] By heating potassium hyxayaanoferrate (II) with conic $H_{2} S O_{4}$
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[D] By the action of conc. $H N O_{3}$ on charcoal

Select the correct statement about elements of group $15^{t h}$ .

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(A) The order of stbility of oxidation state for +3 is $B i^{3 +} > S b^{3 +} > A s^{3 +}$ and for +5 is $B i^{5 +} < S b^{5 +} < A s^{5 +}$
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(B) In the case of nitrogen, all oxidation states from +1 to +4 tend to disproportionate in acid solution.
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(C) There is onsiderable increase in covalent radius from N to P but from As to Bi only a small increase in covalent radius is observed.
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(D) All of these.

Which of the following compounds does not give nitrogen on heating?

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$N a N_{3}$
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${(N H_{4})}_{2} S O_{4}$
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$N H_{4} N O_{2}$
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$(N H_{4}) 2 C r_{2} O_{7}$

A brown coloured mixture of two gases is obtained by the reduction of 6N nitric acid with metallic
copper. This mixture on cooling condenses to a blue liquid which on freezing (-30^o C) gives a blue solid. The correct choice for blue liquid or solid is-

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It is referred to as the anhydride of nitrous acid.
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It is an acidic oxide and hence dissolves in alkalies producing nitrites.
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It can also be prepared by the action of 50% HNO₃ on arsenious oxide and then cooling to 250K.
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All of the above.

Which of the following orders is correct?

(2) $N H_{3} > P H_{3} > A s H_{3} > S b H_{3}$ – Thermal Stability

(3) $N H_{3} > P H_{3} > A s H_{3} > S b H_{3}$ – Basic Character

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$S b H_{3} > N H_{3} > A s H_{3} > P H_{3}$ – Boiling Point
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(A) (1), and (3) only (B) (2), (3) and (4) only
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(C) (1), and (4) only (D) (1), (2), (3) and (4).
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$N H_{3} > P H_{3} > A s H_{3} > S b H_{3}$ – Bond Angle

The oxidation states of S atom in $S_{4} O_{6}^{2 -}$ from left to right respectively are:

$O - S_{\underset{O}{| |}}^{\overset{O}{| |}} - S - S - \overset{\overset{O}{| |}}{\underset{\underset{O}{| |}}{S}} - O$

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+ 6, 0, 0, +6
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+5, +1, +1, +5
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+5, 0, 0, +5
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+3, +1, +1, +3

One gas bleaches the coloured matter by reduction temporary while the other one by oxidation
permanently. The gases are respectively:

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$S O_{2} a n d C l_{2}$
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$O_{3} a n d C l_{2}$
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$H_{2} S a n d C O_{2}$
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$C l_{2} a n d S O_{2}$

$H_{2} S O_{4}$ cannot be used to prepare HI from KI as:

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Its reaction with KI is very slow.
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It oxidizes HI to iodine.
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It disproportionates HI.
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It reduces HI.

The incorrect statement among the following regarding helium is -

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It is used in filling balloons for meteorological observations because it is lighter and non-inflammable.
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It is used to produce and sustain powerful superconducting magnets.
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It is used as a cryogenic agent for carrying out experiments at low temperatures.
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It is used as a dilute for oxygen in modern diving apparatus because of its high solubility in blood.

Assertion : $P b I_{4}$ is not known probably because of the oxidising power of Pb(IV) and reducing power of $I^{-}$ .

Reason : Iodide stabilizes higher oxidation state.

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

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Assertion : $P_{4} O_{10}$ is not used to dry $N H_{3}$ .

Reason : $P_{4} O_{10}$ is acidic and $N H_{3}$ is basic.

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

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Assertion : $H N O_{3}$ is stronger acid than $H N O_{2}$ .

Reason : In $H N O_{3}$ there are two nitrogen to oxygen bonds where as in $H N O_{2}$ there is only one.

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

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Assertion : $H N O_{3}$ oxides sulphur to $H_{2} S O_{4}$ acid ( S + VI) but only oxidizes selenium to $H_{2} S e O_{3}$ ( Se + IV ).

Reason : In Selenium atoms, the electrons are more tightly held by the nucleus on account of increased nuclear charge.

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

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4

Assertion : Sulphur dioxide is more powerful reducing agent in alkaline medium than in acidic
medium.

Reason : Sulphur dioxide reacts with hydrogen sulphide in presence of moisture and sulphur is
precipitated.

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

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Assertion : $S F_{6}$ is used as a gaseous insulator in high voltage generators.

Reason : It is inert and has good dielectric properties.

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

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Sulphuric acid is used-

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In lead storage batteries.
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In making fertilizers.
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As a dehydrating agent.
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All of the above.

Hl cannot be prepared by the action of Kl and H₂SO₄ because -

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Hl is a much weaker acid than H₂SO₄
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Hl gets oxidized by H₂SO₄ to form l₂
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H₂SO₄ is a dehydrating reagent.
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Hl is less volatile than H₂SO₄

Assertion : Finely divided iron does not form ferric chloride with hydrochloric acid.

Reason : Hydrochloric acid produces hydrogen gas with iron.

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

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4

Assertion : $X e F_{6}$ reacts with small quantity of water to form $X e O F_{4}$ .

Reason : $X e F_{6}$ reacts with glass and form $X e O F_{4}$ .

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

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4

Which one of the following does not exist?

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XeOF₄
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NeF₂
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XeF₂
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XeF₆

The hybridisation of atomic orbitals of nitrogen in $N O_{2}^{+}, N O_{3}^{-} a n d N H_{4}^{+}$ are

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(A) sp, sp³ nd sp² respectively
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(B)&nsp;sp, sp² and sp³ respectively
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(C) sp², sp and sp³ respetively
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(D) sp², sp³ an sp respectively

Which of the following hydrides is most acidic

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H₂Te
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H₂Se
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H₂O
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H₂S

The incorrect statement among the following regarding H₂SO₄ is -

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It can act as oxidising agent with copper
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It acts as a dehydrating agent with sugar
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It acts as an acid in its reaction with BaO₂
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It acts as a reducing agent in its reaction with Cu₂O

Which of the following oxide is most acidic

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Na₂O
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Al₂O₃
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P₂O₅
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SO₃

Least acidic oxide among the following is -

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P₄O₆
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P₄O₁₀
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As₄O₆
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As₄O₁₀

Which of the following polyhalide ion is most stable

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$B r_{3}^{-}$
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$I_{3}^{-}$
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$C l_{3}^{-}$
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$F_{3}^{-}$

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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