chemistry Mcqs
651. Unit of Kc is_______________?
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A. moles2dm+6

B. Kc may or may not have units

C. moles-2dm+6

D. moles+2dm-6

653. The correct electronic configuration of Cr is____________________?
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A. [Ar]4s03d5

B. [Ar]4s23d4

C. [Ar] 4s23d4

D. [Ar]4s13d5
654. Which statement is wrong ?
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A. in the equatorial region it acts as pollutant

B. CFCs play effective role in removing O3 in the stratosphere

C. ozone acts as filter for UV radiations

D. the amount of ozone layer is greater in the region close to the equator
655. Decrease in oxidation number is called__________________?
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A. oxidation-reduction

B. all of above represent same entity

C. oxidation

D. reduction
656. In a galvanic cell________________?
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A. Chemical energy is converted into electricity

B. Electrical energy is converted into chemical energy

C. Chemical energy is converted into heat

D. Electrical energy is converted into heat

657. Density of H2SO4 in lead accumulator is__________________?
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A. 1.20g/cm3

B. 1.3g/cm3

C. 1.25g/cm3

D. 1.15g/cm3

659. Radiations are absorbed in_______________?
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A. Spectrophotometer method

B. Optical relation method

C. Refractometric method

D. Dilatometric method

660. Mixtures which distill over without change in composition called___________________?
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A. ideal solution

B. amphoteric mixture

C. zeotropic mixture

D. azeotropic mixture
661. Cement is a mixture of________________?
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A. lime stone and gypsum

B. clay lime stone and gypsum

C. lime stone and clay

D. clay and clinker

662. Animal fats are located particularly in__________________?
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A. Adipose tissues

B. Connective tissues

C. Skeleton tissues

D. Cardiac tissues

664. The determination of correct molecular weight from Raoults law is applicable to_________________?
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A. a non-electrolyte & non volatile solute in concentrated solute

B. a volatile solute in dilute solution

C. non volatile solute in a dilute solution

D. a non-electrolyte & non volatile solute in concentrated solution

666. Which of the following type of reaction is 3rd order reaction_________________?
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A. 2FeCl3 + 6KI ? 2FeI2 + 6KCl + I2

B. None of these

C. 2N2O5 = 2N2O4 + O3

D. NO + O3 ? NO2 + O2

668. Lipids are soluble in___________________?
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A. Solubility has nothing to do with lipids

B. Organic and inorganic solvents

C. Organic solvents

D. Inorganic solvents

670. The molal boiling point constant is the ration of the elevation of boiling point to____________________?
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A. Molarity

B. Mole fraction of solute

C. Molality

D. More fraction of solvent

671. Conjugated base of a weak acid is_________________?
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A. strong

B. unstable

C. weak

D. moderately weak

672. Beckmanns apparatus is used to measure_______________?
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A. lowering of osmotic pressure

B. boiling point elevation

C. depression in freezing point

D. lowering of vapour pressure

673. Protein attached to some non protein group is called____________________?
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A. Conjugated protein

B. Derived protein

C. Sample protein

D. Proteoses

674. The potassium present in plant help the plant to___________________?
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A. ripen the seeds and fruits

B. form starch sugar and fibrous material

C. increase the resistance against disease

D. all the above statements are correct
675. The location of transition elements is in between__________________?
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A. chalcogens and halogens

B. d and f block elements

C. s and p block elements

D. lanthanides & actinides

679. Which one of the following is a buffer solution ?
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A. brine

B. solution of CuSO4

C. blood

D. glue

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

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
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
689. The word Alkali means__________________?
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A. Ashes

B. Spirit

C. Base

D. Basic salt

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
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