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The compounds of Ca are-

Paramagnetic and colourless

Paramagnetic and coloured

Diamagnetic and coloured, provided their anions are also coloured

Diamagnetic and colourless, provided their anions are also colourless

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Explanation

(D). The divalent $C a^{2 +}$ ion has no unpaired electron, hence, its compounds are diamagnetic and colourless, provided their anions are also colourless.

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Calcium hydride can be obtained by heating-

Calcium oxide with hydrogen

Calcium oxide with hydrogen under pressure

Calcium with hydrogen under pressure

Calcium with hydrogen at very low temperature.

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Explanation

(C). $C a + H_{2} \to C a H_{2}$

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Mark the incorrect statement:

Alkali metals are strong reducing agents.

The electropositive nature of alkali metals decreases with increase in atomic number.

Alkali metals have relatively low electronegativity values.

On burning in oxygen lithium forms only the monoxide while other alkali metals form peroxides and or superoxides.

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Explanation

(B). Since ionisation energy decreases on moving down the group, the electropositive character increases on moving down from lithium towards cesium.

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A hydrated water soluble salt, A in solution gives a turbidity with dilute hydrochloric acid evolving a gas with a suffocation odour. The solution of A decolourises lodine solution. A is likely to be

$N a_{2} S O_{4} . 10 H_{2} O$

$N a_{2} S_{2} O_{3} . 5 H_{2} O$

$A g N O_{3}$

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Explanation

(C). The reactions are

$N a_{2} S_{2} O_{3} + 2 H C l \to 2 N a C l + S O_{2} ↑ + S ↓ + H_{2} O$

$2 N a_{2} S_{2} O_{3} + I_{2} \to 2 N a I + \underset{(S o d i u m t e t r a t h i o n a t e)}{N a_{2} S_{4} O_{6}}$

Sodium thiosulfate is an inorganic compound with the formula Naâ‚‚Sâ‚‚Oâ‚ƒxHâ‚‚O. Typically it is available as the white or colorless pentahydrate, Naâ‚‚Sâ‚‚Oâ‚ƒ·5Hâ‚‚O. The solid is an efflorescent crystalline substance that dissolves well in water.

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Which of the following compounds may be soluble in pyridine-

Barium chloride

Sodium chloride

Lithium chloride

Potassium chloride

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Explanation

(C). Due to high positive charge density on $L i^{+}$ , it forms compounds with maximum covalent character. So lithium chloride may be soluble in pyridine.

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Which of the following statement regarding isolation of Na and K metal is true –

These metals can be isolated by the reduction of their oxides

These metals can be prepared from their aqueous salt solutions by metal displacement

These metals can be prepared by the electrolysis of their aqueous salt solutions

These metals can be prepared by the electrolysis of their fused chlorides

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Explanation

(D). Sodium and potassium can be prepared by the electrolysis of their fused chlorides but not from aqueous solutions of their salts, because these metals are very reactive.

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Which of the following is a false statement-

Sodium oxide is more basic then magnesium oxide.

Beryllium oxide is amphoteric

The thermal stability of beryllium carbonate is more than that of calcium carbonate

Beryllium is amphoteric

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Explanation

(C). The thermal stability of calcium carbonate is more as compared to that of beryllium carbonate. The ionic potential ( $ϕ$ ) value of $B e^{2 +}$ is more than that of $C a^{2 +}$ . So $B e^{2 +}$ attracts the oxygen of $C O_{3}^{2 -}$ more and on heating beryllium carbonate losses $C O_{2}$ more easily.

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The basic character of oxides MgO, SrO, $K_{2} O$ , NiO and $C s_{2} O$ increases in the order –

$M g O > S r O > K_{2} O > N i O > C s_{2} O$

$C s_{2} O > K_{2} O > M g O > S r O > N i O$

$N i O < M g O < S r O < K_{2} O < C s_{2} O$

$K_{2} O < N i O < M g O < S r O < C s_{2} O$

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Explanation

(C). Alkali metal oxides are more basic than alkaline earth metal oxides and basic nature increases as we move down the group.

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Which of the following ions is the best conductor of electricity in aqueous solution –

$L i^{+}$

$N a^{+}$

$C s^{+}$

$K^{+}$

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Explanation

(C). Because $C s^{+}$ is least hydrated and can move faster in aqueous solution. Hence it is the best conductor of electricity.

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Which among the following statement is not correct –

Lithium is softest among all the alkali metals

Lithium possesses higher melting and boiling points

It is least reactive among alkali metals

It forms chloride which is soluble in alcohol

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Explanation

(A). Lithium is harder than other alkali metals. In a group the softness of metal increases from top to bottom as the strength of metallic bond decreases.

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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.

No account is required to attempt questions and view answers. A free account adds bookmarks, personal notes, and progress tracking.

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