chemistry MCQs – Page 40

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 Review each marked answer and report any item that may be outdated or unclear.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
781. Acetal on acid hydrolysis generates__________________?
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A. Alcohol

B. Ketone

C. Both A & B

D. None of the above

782. In base catalyzed reaction of carbonyl compound the catalyst___________________?
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A. increases the nucleophilic character of reagent

B. increases electrophilic character of carbonyl compound

C. acidic character of reagent

D. both a and b

783. The common thing in phthalic acid and oxalic acid is that both are_________________?
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A. Strong acids

B. Dicarboxylic

C. Hydrocarbons

D. Aromatic

784. Which compound will readily undergo sulphonation ?
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A. Toluene

B. Benzene

C. Chlorobenzene

D. Nitro benzene

785. Which of the following does not contain phosphorus ?
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A. Bone

B. Nerves

C. Yolk of egg

D. Steel
786. Alkali and alkaline earth metals impart colours when heated over burner. It is due to______________?
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A. Excitation of electrons from low energy levels to higher energy levels

B. Smaller electronegativity of alkali metals

C. Smaller ionic radius of these metals

D. De-excitation of electrons from higher energy levels to low energy level
787. Non-metals usually form _________________ oxides?
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A. Acidic

B. All of the above

C. Neutral

D. Amphoteric

788. Acetic anhydride can be obtained by treating ethyl alcohol with___________________?
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A. P2O5

B. H2SO4

C. Both A and B

D. PCI5

789. Which one of the following is not the use of graphite ?
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A. Lubricant

B. Abrasive

C. Electrode of electrolytic cell

D. Lead pencils

790. Orthoboric acid is 2.6% soluble in water at 40?C and ___________at 107C.
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A. 27%

B. <2.6%

C. 37%

D. 26%

791. How many moles of H2 are added up when benzene is heated with hydrogen in the presence of platinum ?
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A. Two

B. Three

C. Six

D. Four

792. Which electronic configuration corresponds to an element of group IIIA ?
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A. 1s2 2s2 2p4

B. 1s2 2s2 2p6 3s2 3p1

C. 1s2 2s2 2p6 3s2 3p6 4s2 3d1

D. 1s2 2s2 2p3

793. Which of the following possesses maximum hydration energy ?
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A. Mg+2

B. Na+

C. K+

D. Ca+2

794. Amino acids present in cheese___________________?
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A. alanine

B. proline

C. lysine

D. tyrosine
795. When sulphuric acid is treated with ethanol sulphuric acid behaves like________________?
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A. as sulphonating agent

B. an acid

C. a dehydrating agent

D. an oxidizing agent

796. Carbonates of lithium are not stable like that of sodium due to________________?
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A. Low charge density

B. Low electropositivity

C. Low electronegativity

D. Not known yet

797. The atomic radii decreases by increasing atomic number in________________?
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A. Alkaline earth metal

B. Halogens

C. Elements from Li to Ne

D. Alkali metal

798. Formula of Chile saltpetre is__________________?
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A. NaNO3

B. CaCO3

C. Ba (NO3)2

D. NH4Cl

799. Reacting bromine with benzene in the presence of sunlight will result in_______________?
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A. The rupturing of benzene ring

B. No-reaction

C. Substitution reaction

D. Addition reaction
800. Co-enzymes are_________________?
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A. Proteineous

B. lipids

C. sugars

D. Non proteineous