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NEET NEET Questions — Free MCQ Practice

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Phosphate rock (fluorapatite) on reaction with orthophosphoric acid produces:

A.

$C a {(H_{2} P O_{4})}_{2} + C a F_{2}$

B.

$C a_{3} {(P O_{4})}_{2} + C a F_{2} + H_{2} O$

C.

$C a {(H_{2} P O_{4})}_{2} + H F$

D.

$C a_{3} {(P O_{4})}_{2} + H F + H_{2} O$

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Explanation

$3 C a_{3} {(P O_{4})}_{2} C a F_{2} + 14 H_{3} P O_{4} \to 10 C a {(H_{2} P O_{4})}_{2} + 2 H F$ (Triple super phosphate).

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Which of the following is correct?

A.

$S_{3} O_{9}$ – contains no S - S linkage.

B.

$S_{2} O_{6}^{2 -}$ – contains – O - O linkage.

C.

${(H P O_{3})}_{3}$ – contains P – P linkage.

D.

$S_{2} O_{8}^{2 -}$ - contains S – S linkage.

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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.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(C) $P b^{2 +}$ is more stable because of inert pair effect. $I^{-}$ being larger has the tendency to lose the electron easily.

Smaller and highly electronegative elements like $F^{-}$ can stabilize the higher oxidation state
not $I^{-}$ .

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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.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(A) $P_{4} O_{10} + 12 N H_{3} + 6 H_{2} O \to 4 {(N H_{4})}_{3} P O_{4}$

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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.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(C)Conjugate base of $H N O_{3}$ , the $N O_{3}^{-}$ is more stable (charge dispersion on three oxygen atoms) than conjugate base of $H N O_{2}$ , the $N O_{2}^{-}$ (charge dispersion on two oxygen atoms).

There are three nitrogen to oxygen bonds in $H N O_{3}$ and two in $H N O_{2} .$

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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.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(A) Filling of 10 electrons in 3d-subshell enhances the effective nuclear charge on account of the
poor sheilding and thus the electrons are held more tightly. This is the reason why selenium is
reluctant to attain the highest oxidation state of (VI).

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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.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(B) $2 H_{2} O + S O_{2} ⇋ S O_{4}^{2 -} + 4 H^{+} + 2 e^{-}$ (increase in $[H^{+}]$ will shift the equilibrium in backward direction)

$S O_{2} + 4 O H^{-} ⇌ S O_{4}^{2 -} + 2 H_{2} O + 2 e^{-}$ (increase in $[O H^{-}]$ will shift the equilibrium in forward direction)

$2 H_{2} S + S O_{2} \overset{m o i s t u r e}{\to} 2 H_{2} O + 3 S ↓$

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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.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(A) Inertness of $S F_{6}$ is due to the presence of sterically protected sulphur atom which does not allow
thermodynamically favourable reactions like hydrolysis to take place.

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

Reason : Hydrochloric acid produces hydrogen gas with iron.

A. If both the assertion and the reason are true and the reason is a correct explanation of the assertion B. If both the assertion and reason are true but the reason is not a correct explanation of the assertion C. If the assertion is true but the reason is false D. If both the assertion and reason are false

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Explanation

(A) $F e + 2 H C l \to F e C l_{2} + H_{2}$

Liberation of hydrogen prevents the formation of ferric chloride.

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Which one of the following does not exist?

A.

XeOF₄

B.

NeF₂

C.

XeF₂

D.

XeF₆

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Explanation

NeF₂does not exist.

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