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NEET Practice Questions (MCQs) with Answers & Solutions

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Manufacture of NaOH is done by:

Canstner - Kellner process

Solvay process

Brine process

Mond's process

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Explanation

(a) It is also a method for manufacture of NaOH.

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Sodium forms Na⁺ and not Na²⁺ because:

sodium contains only one electron in outermost shell

first ionisation potential is small and the difference in first and second ionisation potential is very large

radius of Na⁺ is much smaller than of Na⁺

none of the above

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Explanation

(b) It is a reason for given fact

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Lithium is the only alkali metal which is not placed in kerosene but is wrapped in paraffin wax, because:

it reacts with kerosene

it floats to the surface of kerosene because of low density

it does not react with air and H₂O

none of the above

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Explanation

(b) It is a reason for given fact.

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When CO₂ is bubbled into an aqueous solution of Na₂CO₃, the following is formed:

H₂O

OH-

NaHCO₃

NaOH

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Explanation

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Which of the alkali metal chloride is expected to have highest m.p. ?

LiCl

NaCl

KCl

RbCl

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Explanation

(b) In case of halides of alkali metals, melting point decreases going down the group because lattice enthalpies decreases as size of alkali metal increases. But LiCl has lower melting point in comparison to NaCl due to covalent nature. Thus, NaCl is expected to have the highest melting point among given halides.

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Baking soda or baking powder is:

washing soda

caustic soda

soda ash

sodium bicarbonate

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Explanation

(d) Baking soda is NaHCO₃.

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The element which does not dissolve in caustic soda is:

silicon

aluminium

zinc

cadmium

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Explanation

(d) Cd does not dissolve with NaOH.

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Sodium carbonate is manufactured by Solvay process. The products those are recycled are:

CO₂ and NH₃

CO₂ and NH₄Cl

NaCl and CaO

CaCl₂ and CaO

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Explanation

(a) Follow Solvay process for Na₂CO₃

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Washing soda is:

Na₂CO₃

Na₂CO₃.H₂O

Na₂CO₃.7H₂O

Na₂CO₃.10H₂O

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Explanation

(d) Washing soda is chemically Na₂CO₃.10H₂O

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When sulphur is heated with NaOH(aq) the compounds formed are:

Na₂S + H₂O

Na₂SO₃ + H₂O

Na₂S + Na₂S₂O₃ + H₂O

Na₂S₂O₃ + H₂O

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Explanation

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