chemistry MCQs – Page 46

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 Review each marked answer and report any item that may be outdated or unclear.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
901. The scientist who did not contribute in the construction of periodic table ?
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A. Democritus

B. Dobereiner

C. Al-Razi

D. Moseley

902. First ionization potential of alkaline earth metal is greater than alkali metals because___________________?
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A. They have smaller atomic sizes

B. All

C. They have greater atomic radii

D. They are more reactive

903. When benzene is substituted by halogens only which one of the following halogens only which one of the following halogens is given the number one position in the ring while writing the name of compound ?
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A. Bromine

B. Chlorine

C. Iodine

D. Fluorine

904. Best position of hydrogen in the periodic table is above I.A Group which is mainly due to_______________?
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A. Both are electropositive

B. Similar outer most shell electronic configuration

C. Both form ionic compounds

D. All
905. End name of enzyme is___________________?
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A. one

B. yl

C. ase

D. al

906. Replacement of hydrogen of benzene by alkyl group in the presence of alkyl halide & aluminum chloride is known as__________________?
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A. Friedel & Craft alkylation

B. Clemmenson reduction

C. Friedel & Craft acylation

D. Dows process

907. The resonance energy of benzene is__________________?
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A. 150.5 kJ/mol

B. 250.5 Cal/mol

C. 150.5 Cal/mol

D. 250.5 kJ/mol

908. The composition of brown ring in nitrate test is_________________?
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A. FeSO4.No3

B. FeSO4.N2o

C. FeSO4.No

D. FeSO4.No2

909. A elements are named as alkali metals because_______________?
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A. Their oxides are basic

B. Their oxide and hydroxides are water soluble

C. Both A & B

D. They are found in earth

910. Which one of the following acids is present in lemon juice ?
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A. Benzoic acid

B. Tartaric acid

C. Citric acid

D. Oxalic acid

911. Activated complex is formed due to________________?
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A. Temperature

B. Effective collision

C. Pressure

D. Ineffective collisions

912. Oxidation of primary alcohol gives________________?
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A. Ester

B. Alkene then COOH

C. ketone

D. Aldehyde
913. Benzene is heated in air with V2O5 at 450C it undergoes________________?
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A. Substitution reaction

B. Addition reaction

C. Oxidation reaction

D. Elimination reaction

914. Which allotropic form of phosphorous is the most stable ?
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A. White

B. black

C. red

D. Violet

915. Aluminium oxide is_________________?
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A. Amphoteric oxide

B. It does not exists

C. Basic oxide

D. Acidic oxide

916. Which of the following does not give Borax bead test ?
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A. Cu

B. Cr

C. Ni

D. A1
917. In modern periodic table all the leements are arranged in ascending order of__________________?
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A. Atomic mass

B. Valence electrons

C. Atomic number

D. Valency

918. The basic hydrolysis of ethyl acetate produces__________________?
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A. ethanol and sodium acetate

B. ethanol and acetic acid

C. ethanol

D. acetic acid

919. Which one of the following is not a periodic property ?
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A. Ionization energy of elements

B. Coordination number of ions

C. Melting point of elements

D. Boiling point of elements

920. The process of aluminium extraction is called__________________?
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A. Thermite process

B. Haber process

C. Contact process

D. Hall process