Chemistry MCQs

Page No. 57

Which of the following is incorrect statement about nitrogen importance ?


aIt enhances plant growth

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bIt is involved in the synthesis of protein and nucleic acids

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cit accelerates fruits and flowers growth

✓


dIt is involved in the chlorophyll synthesis

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The important function of burning zone in the rotary kiln is __________________?


ato dry the moisture of slurry

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bto decompose lime stone to unslaked lime

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ccombination of different oxides like CaO SiO2 Fe2O3 and Al2O3

✓


dto reduce the impurities

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The composition of mixture of clay and lime stone in the raw for cement material is __________________?


a75% lime stone and 25% clay

✓


b25% lime stone and 75% clay

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c15% lime stone and 55% clay

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d55% lime stone and 15% clay

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Which sequence of steps is correct for the manufacture of cement ?


acrushing heating mixing grinding

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bcrushing mixing heating grinding and mixing

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ccrushing grinding mixing heating

✓


dmixing heating grinding crushing

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Cement is a mixture of so many compounds roasted in rotary kiln. Which substances has greater percentage ?


aLime (CaO)

✓


bSilica (SiO2)

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cAlumina (Al2O3)

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dMagnesia (MgO)

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View Answer Lime (CaO)

Cement is a mixture of________________?


aclay and clinker

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bclay lime stone and gypsum

✓


clime stone and gypsum

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dlime stone and clay

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Which one of the following fertilizers provides the nitrogen and phosphorus to the plant ?


aurea

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bcalcium superphosphate

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cdiammonium phosphate

✓


dpotassium nitrate

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View Answer diammonium phosphate

The percentage of nitrogen in urea is________________?


a36%

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b46%

✓


c56%

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d66%

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View Answer 46%

Which one of the following set of raw material is most suitable for manufacture of urea ?


aCH4 N2 and CO2

✓


bH2 N2 and CO

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cH2 CO2 and H2O

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dH2O N2 and H2

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View Answer CH4 N2 and CO2

How many zones through which the charge passes in a rotary kiln ?


a4

✓


b3

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c2

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d5

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View Answer 4

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