chemistry MCQs – Page 47

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 Review each marked answer and report any item that may be outdated or unclear.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
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