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NEET Practice Questions (MCQs) with Answers & Solutions

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Which salt will not impart colour to flame?

LiCl

MgCl₂

CaCl₂

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Explanation

Mg does not impart in flame colouration.

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Which of the following alkali metal ion in aqueous solution is the best conductor of electricity?

Li⁺

Na⁺

Cs⁺

K⁺

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Explanation

Cs⁺ is least hydrated due to bigger in size. So, it moves rapidly in aqueous solution and best conductor of electricity.

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Which of the following has largest size in aqueous solution.

Rb⁺

Na⁺

K⁺

Li⁺

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Explanation

Size in aq. solution $\propto \frac{1}{ionic size}$

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A coloured salt violet colour to Bunsen flame. It is:-

Na₂CO₃

K₂CO₃

Cu(OH)₂

MgCO₃

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Explanation

Potassium gives violet colour

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Which of the following is soluble in pyridine:-

LiCl

CsCl

NaCl

KCl

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Explanation

LiCl is covalent so can get dissolve in organic solvent

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Dissolving metallic Zn in excess of NaOH produces:-

Na₂ZnO₂

Zn(OH)₂

ZnO

Zn(OH)₂ & Na₂ZnO₂

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Explanation

$NaOH + Zn \overset{}{\to} {Na}_{2} {ZnO}_{2} + H_{2}$

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Which of the following form superoxide on heating with excess of air :-

Li, Na

Mg, Be

Na, K

K, Rb

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Explanation

K, Rb, Cs forms superoxide

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For the alkali metals, which of the following increases with increasing atomic number:-

I.P.

Atomic radius

Hydration energy of univalent ion

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Explanation

Atomic radius increases as the atomic number increases.

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Sodium carbonate solution in water is alkaline due to

hydrolysis of Na+

hydrolysis of ${CO}_{3}^{2 -}$

hydrolysis of Na+ and ${CO}_{3}^{2 -}$ ions

none of these

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On heating Li₂CO₃ and Na₂CO₃.10H₂O, residue is left after heating. The weight loss is due to

Evolution of CO₂ from Na₂CO₃.10H₂O only

Evolution of CO₂ from Li₂CO₃ only

Due to evolution of CO₂ from Li₂CO₃ and H₂O from Na₂CO₃.10H₂O

H₂O from Na₂CO₃.10H₂O

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Explanation

li2co3 is thermally unstable..so will give co2, where as Na2CO3 will lose water of crystallization.

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