chemistry MCQs – Page 30

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 Review each marked answer and report any item that may be outdated or unclear.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
581. Cement is a mixture of so many compounds roasted in rotary kiln. Which substances has greater percentage ?
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A. Lime (CaO)

B. Magnesia (MgO)

C. Alumina (Al2O3)

D. Silica (SiO2)

582. Reaction at anode is called________________?
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A. oxidation

B. reduction

C. redox

D. decomposition

583. Which of the following is not a condition for the formation of smog ?
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A. sufficient NO

B. sunlight

C. winds

D. less movement of air

584. Which of the following are the conditions of colligative properties_______________?
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A. All of the above

B. Dilute solution

C. Non-volatile solute

D. Non-electrolye solute

585. Which of the following fertilizers is not useful for paddy rice ?
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A. urea

B. Ammonium sulphate

C. DAP

D. Ammonium nitrate
586. Which is sold as fertilizer ___________________?
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A. MnSiO3

B. Ca3(PO4)2

C. Na2SiO3

D. CaSiO3

587. Solubility of KCIO3 gives__________________?
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A. continuous and rising solubility curve

B. continuous and falling solubility curve

C. discontinuous and rising solubility curve

D. discontinuous and falling solubility curve

588. Addition of urea to the soil is ____________ reaction?
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A. endothermic

B. exothermic

C. both a and b

D. no heat energy is involved

589. Major cause of SO2 on global scale is__________________?
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A. all

B. combustion

C. electric sparks

D. volcanoes
590. In electrolytic cell electricity carries________________?
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A. non-wpontaneous reaction

B. all of above

C. spontaneous reaction

D. neutralization

591. Which of the following is incorrect statement about nitrogen importance ?
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A. It is involved in the chlorophyll synthesis

B. It is involved in the synthesis of protein and nucleic acids

C. it accelerates fruits and flowers growth

D. It enhances plant growth

592. A substance which increases the reactivity of enzyme is called_________________?
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A. Promoters

B. Non-activators

C. Stimulators

D. Inhibitors

593. Which of the following is the most suitable catalyst for ammonia synthesis ?
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A. Fe in fused mixture of Al2O3 + SiQ2 + MgO

B. All of the above

C. ZnO + Cr2O3

D. Pt

594. Which one of the following set of raw material is most suitable for manufacture of urea ?
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A. H2O N2 and H2

B. CH4 N2 and CO2

C. H2 N2 and CO

D. H2 CO2 and H2O

595. When a compound of transition element is dissolved in a solution of salt then it produces____________________?
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A. complex ions

B. simples ions

C. double salts

D. strong anions

596. Which of the following potassium fertilizers are more useful for horticultural crops tobacco & potatoes ?
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A. KMnO4

B. KCI

C. K2SO4

D. KNO3
597. Rate expression for ammonia synthesis is___________________?
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A. Kc=x2/v(a-x)

B. Kc=x2/(a-x)(b-x)

C. Kc=42/(a-2x)2(b-x)

D. Kc=4x2v2/(a-x)(b-3x)3
598. When the reaction completes in more than one steps rate of reaction will be determined by________________?
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A. Fast step

B. All steps

C. Molecularity of the reaction

D. Slowest step
599. Which of the following air pollutants is more dangerous for ozone layer ?
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A. CO2

B. Oxides of nitrogen

C. CO

D. CFC
600. 1 molar solution of glucose in water contains weight of glucose________________?
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A. 180g/dm3

B. 190g/dm3

C. 195g/dm3

D. 170g/dm3