chemistry MCQs – Page 27

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 Review each marked answer and report any item that may be outdated or unclear.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
521. Which of the following is used as water disinfectant to avoid the formation of toxic compounds_________________?
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A. Cl2

B. O3

C. ClO2

D. both B & C
522. When common salt is dissolved in water ?
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A. Boiling point of water increase

B. Boiling point of water remains same

C. Boiling point of water decrease

D. None of the above

523. Geometry of the complex compounds usually depends upon __________________?
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A. hybridization of central metal

B. type of ligands

C. types of hybridization in the elements of ligands

D. All of above

524. Molten NaCl conducts electricity due to the presence of_______________?
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A. Free molecules

B. Atoms of Na and Cl

C. Free ions

D. Free electrons

525. Which of the following will not change the concentration of ammonia at the equilibrium ?
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A. Increase of volume

B. Addition of catalyst

C. Increase of pressure

D. Decrease of temperature

526. Voltaic cell is a_________________?
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A. alkaline cell

B. reversible cell

C. all of the above

D. irreversible cell

527. Which of the following will have very high rate of reaction ?
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A. Ionic reactions

B. all of above

C. Double decomposition reaction

D. Neutralization reaction

528. What is clinker ?
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A. roasted argillaceous material

B. roasted gypsum

C. roasted calcareous and argillaceous material

D. roasted calcareous material

529. The percentage of suspended solid waste in raw water is removed by coagulation is__________________?
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A. 90

B. 80

C. 70

D. 60

530. In the purification of portable water the coagulant used is_________________?
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A. copper sulphate

B. barium sulphate

C. nickel sulphate

D. alum
531. Which of the following unit of concentration is independent of temperature ?
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A. all

B. Mole fraction

C. Molality

D. Molarity

532. E0red of an element cab be calculated by comparing it with _____________________?
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A. 2M solution of HCI

B. 1M solution of ions of respective element

C. SHE

D. New electrode of same element

533. Hypochlorous acid is used for disinfecting the water it reacts with the dissolved ammonia producing___________________?
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A. NHCI2

B. NH2Cl

C. NCI2

D. all of the above
534. AgCl dissolved with conc (210-2) Ksp will be__________________?
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A. 4 x 10-4

B. 3.6 x 10-5

C. 3.6 x 10-6

D. 7.2 x 10-6

535. Spontaneous reactions are_______________?
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A. not natural

B. Fast

C. Slow

D. Moderate

536. Common example of carbohydrates are__________________?
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A. Legumin amylopectin albumin

B. Glycerol phospho lipids collagen

C. Glyceraldehydes glucose peptone

D. Cellulose glycogen galactose
537. Which of the following solutions of H2SO4 is more concentrated ?
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A. 1 normal solution

B. all have same concentration

C. 1 molal solution

D. 1 Molar solution
538. Chlorination of water may be harmful if the water contains_________________?
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A. All

B. Ammonia

C. Dissolved oxygen

D. Carbon dixide

539. The addition of a catalyst to the reaction system__________________?
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A. Increases the rate of forward as well as backward reaction equally

B. Increases the rate of forward reaction only

C. Increases the rate of forward but decreases the rate of backward reaction

D. Increases the rate of reverse reaction

540. Greater value of standard reduction potential greater will be tendency__________________?
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A. to get oxidized

B. to get reduced

C. to accept electrons

D. both B and C