chemistry MCQs – Page 19

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 Review each marked answer and report any item that may be outdated or unclear.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
921. Iodine is solid due to_________________?
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A. Strong hydrogen bonding

B. High polarizability

C. Strong covalent bond

D. Large value of dipole moment

922. The atoms of same element having same atomic number but different mass number are called____________________?
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A. Isotropes

B. Isotopes

C. Isobars

D. Isomers

923. Elements in the same vertical group of the periodic table have same_______________?
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A. Atomic mass

B. Atomic number

C. Atomic volume

D. Number of valence electrons
924. Concept of Triads was introduced by_______________?
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A. Al-Razi

B. Dobereiner

C. Mendeleev

D. Newland

925. Acidic amino acids have________________?
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A. 2 amino and 2 carboxylic groups

B. 2 carboxylic groups and 1 amino group

C. 1 amino and 1 carboxylic groups

D. 2 amino groups and 1 carboxylic group

926. Which one of the followings possesses melting point below 0C?
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A. Nitrogen

B. Carbon

C. Bismuth

D. Phosphorus

927. Boric acid cannot be used__________________?
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A. In soda bottles

B. For enamel and glazes

C. For washing eyes

D. As antiseptic in medicine

928. Which one of the following is not a semiconductor ?
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A. Ge

B. Sn

C. Se

D. Si

929. Borax is a white crystalline solid and it is_________________?
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A. Soluble only in organic solvents

B. More soluble in cold water

C. More soluble in hot water

D. Insoluble in water

930. Periodic table provides a basic framework to study elements with respect to their__________________?
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A. Properties of their compounds

B. All

C. Chemical properties

D. Physical properties

931. Inner transition elements are called _________________?
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A. Lanthanides

B. Rare earth metals

C. Actinides

D. All
932. Each catalyst has_________________?
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A. Specificity

B. Its own Ea

C. Special structure

D. all of above
933. Which of the following is an unsaturated carboxylic acid___________________?
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A. maleic acid

B. oxalic acid

C. succinic acid

D. malonic acid

934. The ether used in Wurtz synthesis is__________________?
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A. basic

B. acidic

C. dry

D. aqueous

935. Alkanes containing a methyl group on main chain at 2nd carbon are called________________?
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A. neo-alkane

B. iso-alkane

C. normal-alkane

D. branched-alkane

936. The PH of the 0.0032 M H2SO4 is__________?
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A. 1

B. 2.198

C. 4

D. 3.2
937. The octane number of zero is assigned to____________?
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A. iso-octane

B. 3-methyl octane

C. 2-methyl octane

D. n-heptane
938. When phenol is heated with concentrated nitric acid the product is________________?
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A. Picric acid

B. 1 3 5 -trinitro benzene

C. p-nitrophenol

D. o-nitrophenol

939. The bond angle between hybrid orbitals in methane CH3 is___________?
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A. 180

B. 115.5

C. 105. 7

D. 109.5
940. Which one of the following is most acidic?
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A. P-nitrophenol

B. M-nitrophenol

C. O-nitrophenol

D. Phenol

941. Sabatier Senderns reaction involve _____________ in presence of Ni?
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A. alkyne & Cl2

B. Aalkene & H2

C. alkene & O2

D. alkene & N2

942. Which of the halogen has highest electronegativity ?
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A. Iodine

B. Fluorine

C. Bromine

D. Chlorine

943. Which one is not a nucleophile ?
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A. C2H5O-

B. H3C+

C. NH3

D. SCN-

944. General formula of alkyne is______________?
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A. CnH2n

B. CnH2n + 2

C. CnH2n + 2

D. CnH2n 2
945. Water gas heated at 450?C and 200 atm pressure in the presence of ZnO+Cr2O3 will produce________________?
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A. carbonic acid

B. methanol

C. methanol

D. methane

946. The relatively high energy of the gauche conformation of butane is primarily associated with_________?
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A. Torsional strain

B. Steric strain

C. Angle strain

D. Orbital strain

947. When alcohol reacts with phosphorous halides it geive____________________?
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A. alkanes

B. alkyl halides

C. alkyl amine

D. alkynes

948. Ethylene epoxide treated with Grignards reagent followed by acid hydrolysis yield __________________?
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A. tertiary alcohol

B. secondary alcohol

C. dihydric alcohol

D. primary alcohol
949. The purpose of Smelting an ore is to________?
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A. Reduce it

B. Oxidize it

C. Separate volatile impurities

D. Obtain an alloy

950. The distinction test for primary secondary and tertiary alcohol required to react each of them is_________________?
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A. Cone. HCI and anhydrous ZnCl2

B. Cone. HCI and anhydrous CaCl2

C. Cone. HCI and anhydrous PCl2

D. Cone. HCI and anhydrous SOCl2