chemistry MCQs – Page 41

Practise multiple-choice questions from chemistry for competitive examinations and subject revision. Review each marked answer and report any item that may be outdated or unclear.

chemistry Mcqs
801. P2O5 is a hygroscopic powder which sublimes at______________?
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A. 630C

B. 360C

C. 620C

D. 260C

802. The test which is used for the identification of amino-acids is_________________?
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A. Biuretic test

B. Benedict test

C. Ninhydrin test

D. Molisch test

803. Silicon differ from silica by a group of__________________?
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A. OCH3

B. OH

C. Ch3

D. O2

804. The irritation caused by red ants bite is due to____________________?
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A. Uric acid

B. Acetic acid

C. Formic acid

D. Lactic acid

805. If temperature of gallium arsenide is increased then its conductivity will___________________?
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A. decrease

B. remains constant

C. first decreases then increases

D. increase
806. Ammonia may be prepared by heating ammonium chloride with_______________?
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A. Water

B. H2SO4

C. NaCl

D. Aqueous sodium hydroxide
807. Amphoteric exides are those which possess ____________ properties?
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A. Acidic

B. Neutral and acidic

C. Acidic and basic

D. Basic

808. Which one of following is not a property of pure quartz ?
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A. Brittle

B. Hard

C. All of above

D. Coloured solid
809. Which of the following reactions may be assoclated with aldehyde and ketone ?
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A. nucleophile addition

B. all of the above

C. polymerization

D. oxidation

810. Which one exhibits aldol condensation____________________?
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A. C6H5CHO

B. HCHO

C. Cl3CCHO

D. CH3COCH3
811. The carbon atom of carbonyl group is__________________?
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A. sp2 hybridized

B. cp3 hybridized

C. dsp2 hybridized

D. sp hybridized

812. Phenanthrene is a fused polycyclic compound contains __________ benzene rings ?
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A. Three

B. Two

C. Five

D. Four

813. Which one of the following sets consists of all coinage metals ?
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A. Ag Au Hg

B. Cu Ag Au

C. Cu Hg Au

D. Cu Fe Au

814. Which of the following substances does not give iodoform test ?
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A. acetaldehyde

B. methyl alcohol

C. ethyl alcohol

D. acetone

815. Which acid is the manufacture of synthetic rubber ?
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A. Formic acid

B. Acetic acid

C. Carbonic acid

D. Benzoic acid

816. Sodium is not observed in +2 oxidation state because of its__________________?
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A. high second ioniation potential

B. high first ionization potential

C. high electronegativity

D. high ionic radius

817. Arsenic oxides are removed by passing through_________________?
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A. Sodium hydroxide

B. Aluminium hydroxide

C. Calcium hydroxide

D. Ferric hydroxide
818. The deliquescence is a property in which a solid____________________?
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A. Loses water of crystallization

B. Absorbs moisture and turns to liquid form

C. Increases the number of water of crystallization

D. Absorbs moisture and remains solid

819. Which element was not known when Mendeleev proposed his classification ?
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A. Copper

B. Germanium

C. Sodium

D. Hydrogen

820. Which element is necessary for normal leaf development ?
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A. Ca

B. Ba

C. Si

D. Mg