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All Physics Chemistry Botany Zoology

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MgO is a-

Acidic oxide

Basic oxide

Neutral oxide

Amphoteric oxide

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Explanation

(B). It is a basic oxide and hence reacts with acids to form salts.

$M g O + 2 H C l \to M g C l_{2} + H_{2} O$

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Which of the following statements is wrong ?

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

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

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

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

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Explanation

(A). $4 L i N O_{3} \to 2 L i_{2} O + 4 N O_{2} + O_{2}$

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

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

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

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

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

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Explanation

(D). Due to high charge density of $L i^{+}$ is attracts more water molecules and becomes bulky so the ionic conductances of $M^{+}$ ions increase from $L i^{+}$ ion to $C s^{+}$ ion.

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Which of the following halides has the highest melting point-

NaCl

KCl

NaBr

NaF

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Explanation

(D). Apply Fazan’s rule.

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

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

CaO, $K_{2} O$

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

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

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Explanation

(B). Alkali and alkaline earth metals are strong reducing agents. Hence they can not be prepared by the reduction of their oxides.

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Which of the following statement is false regarding saline hydrides –

They conduct electricity in molten state

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

They are used as reducing agents

They are covalent in nature

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Explanation

(D). They are not covalent, but ionic in nature.

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Which of the following is an amphoteric oxide-

CaO

SrO

BeO

MgO

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Explanation

(C). BeO, because it is least electropositive in its group. Therefore, instead of basic oxide, it forms amphoteric oxide.

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Which one of the following about compounds of lithium is false –

The hydroxide, carbonate, nitrate decomposed to give the oxide on heating

It is the most electronegative element of group IA

The hydrogen carbonate cannot be isolated as a stable solid

It forms a superoxide

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Explanation

(D). Lithium forms an oxide $L i_{2} O$ , but not the peroxide or super oxide, because strong polarising power of small sized $L i^{+}$ ion is strong enough to restrict the oxidation of an oxide ion $O^{2 -}$ to the peroxide ion, $O_{2}^{2 -}$ .

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Which one of the following is most stable in ether-

$B e C l_{2}$

$C a C l_{2}$

$S r C l_{2}$

None of these

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Explanation

(A). Due to smaller cation $B e C l_{2}$ is most covalent and is most stable in ether.

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The strongest reducing agent is-

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Explanation

(D). The oxidation potential which is a measure of the tendency of an element to loose electrons (i.e. a measure of electropositive character and of straight as a reducing agent of an element) increases from Be to Ba. Hence, the electropositive character and strength as a reducing agent increases from Be to Ba

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Yes. You can attempt every NEET question on this page for free without logging in, and check the correct answer with a detailed explanation instantly.

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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.