chemistry MCQs – Page 35

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 Review each marked answer and report any item that may be outdated or unclear.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
681. By the addition of base in waterpH will be_______________?
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A. no effect

B. more than 7

C. less than 7

D. equal to 7

682. What do we call to sudden expansion of plasma ?
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A. Joule Thompson effect

B. Avogadros law

C. Grahams law of diffusion

D. Daltons law of partial pressure

683. The most electronegative element among the following is_________________?
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A. P

B. Sb

C. As

D. N
684. Identify the correct statement regarding CO_______________?
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A. it is used to prepare aerated drinks

B. it is powerful oxidizing agent

C. it combines with H2O to form carbonic acid

D. it reacts with red blood cells of haemoglobin
685. Magnesium metal does not burn in the vessel containing_______________?
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A. N2

B. O2

C. N2 and O2

D. Ne
686. Iodoform test can be used to distinguish between_________________?
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A. all of the above

B. acetaldehyde and methanal

C. ethanol and methanol

D. acetone and diethyl ketone

687. One of the outstanding features of boron is its ability to form__________________?
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A. Ionic compounds

B. Semiconductors

C. Molecular crystals

D. Molecular addition compounds
688. The substances that reduces the effectiveness of a catalyst are called ___________________?
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A. Inhibitors

B. Poisoning catalysts

C. pro-catalysts

D. Promoters

689. The word Alkali means__________________?
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A. Ashes

B. Spirit

C. Base

D. Basic salt

690. In network of silica (SiO2) each silicon atom is surrounded by _____________ atoms of osygen?
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A. 2

B. 1

C. 4

D. 6

691. Which one of the following element has highest oxidation state in its compounds ?
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A. Cr

B. Sn

C. Mn

D. O

692. Mixture of catalysts Cr2O3 + A?2O3 + SiO2 at 500?C are used when benzene is prepared from_______________?
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A. acetylene

B. Sodium benzoate

C. Benzene sulphonic acid

D. N-hexane
693. Modern periodic table has been divided in ___________ blocks?
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A. 8

B. 4

C. 2

D. 7

694. In which of the following pairs are elements belonging to the same group ?
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A. Boron & Beryllium

B. Nitrogen & Phosphorous

C. Gallium & Helium

D. Magnesium & Aluminium

695. Chlorination of toluene in the presence of sublight produces_________________?
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A. benzoic acid

B. o chlorotoluene

C. Benzyl chloride

D. p chlorotoluene

696. The formula of palmitic acid_________________?
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A. C17H35COOH

B. C17H33COOH

C. C15H31COOH

D. C13H27COOH

697. Oxidation state of an atom represents____________________?
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A. Number of electrons lost

B. Its vacancies

C. Number of electrons gained

D. Apparent charge in compound
698. Which ion will have maximum value of heat of hydration ?
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A. Cs+

B. Ba+

C. Mg+2

D. A1+3
699. Special features of borate glass is that it is_________________?
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A. Low melting

B. Heat resistant

C. Used to prepare chemical garden

D. Green in colour

700. Addition of 2% gypsum in cement________________?
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A. Triggers hydration

B. Prevents rapid hardening

C. all of the above

D. Triggers hydrolysis