chemistry MCQs – Page 22

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 Review each marked answer and report any item that may be outdated or unclear.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
421. The technique used to separate components of mixture in solid phase ?
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A. Filtration

B. Crystallization

C. Solvent extraction

D. Sublimation
422. C5H12 has the number of isomers ___________________?
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A. two

B. one

C. four

D. three
423. Which one is not the partial pressure of oxygen in the lungs ?
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A. 116 torr

B. 0.1526 atm

C. 116 mm of Hg

D. 1 atm
424. A technique of partition chromatography in which the solvent is in a pool at the bottom of container_______________?
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A. Descending chromatography

B. Radial chromatography

C. Adsorption chromatography

D. Ascending chromatography
425. Formation of vapours from the surface of a liquid is called________________?
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A. cracking

B. condensation

C. evaporation

D. vapourization

426. the fractional distillation of petroleum produces gasoline up to ________________?
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A. 30%

B. 15%

C. 10%

D. 20%
427. In CCI4 I2 shows________________?
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A. Purple colour

B. Red colour

C. Yellow colour

D. Blue colour

428. Direct conversion of solids into vapours is called ___________________?
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A. vaporization

B. crystallization

C. Solvent extraction

D. sublimation
429. Pentane and 2-methyl butance have the same_______________?
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A. Percentage composition

B. Boiling point

C. Structural formula

D. Melting point

430. The highest temperature at which a substance can exist as a liquid is called its______________?
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A. Absolute temperature

B. Upper consulate temperature

C. Critical temperature

D. Standard temperature

431. Which of the following is not considered as an intermolecular force between molecules ?
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A. London dispersion forces

B. Hydrogen bonds

C. Debye forces

D. Coordinate covalent bonds
432. Secondary cell is_____________________?
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A. Daniel cell

B. rechargeable

C. non rechargeable

D. electrolytic cell

433. Every sample of matter with uniform properties and fixed composition is called_________________?
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A. solute

B. solution

C. solvent

D. phase
434. Any process of chemical decay of metals due to the action of surrounding medium is called__________________?
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A. corrosion

B. coating

C. enameling

D. activation

435. For a reaction involving only gases at 25?C the equilibrium constant can be expressed in terms of molarity Ke or partial pressure Kp. Which is true about the numerical value of Kp ?
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A. Kc is generally greaer than Kp

B. Kc is generally less than Kp

C. Kc is equal to Kp if the total moles of reactants and products are equal

D. Kc is generally equal to Kp

436. The cooling of molten urea by air in the tower is called______________________?
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A. evaporation

B. crystallization

C. condensation

D. prilling
437. Which of the following substance do not show continuous solubility curve ?
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A. PbCl2

B. Na2SO4. 10H2O

C. K2Cr2O7

D. KCIO4

438. Which one of the following makes the bulk of hydrospheres content ?
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A. oceans

B. glaciers & icecaps

C. All have equal distribution

D. fresh water lakes and ponds

439. Reaction which proceeds in both directions is called_______________?
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A. non-spontaneous

B. spontaneous

C. reversible

D. irreversible

440. Which set of solutes will form a buffer when dissolved in water to make 1 litter of solution ?
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A. 0.0002M HCI

B. 0.4 mole of CH3COOH with 0.4 mole of NaOH

C. 0.2 mole of NaCI with 0.2 mole of HNO3

D. 0.4 mole of NH3 with 0.2 mole of HCI