Chemistry MCQs

Page No. 31

Which of the following will give phosphoric acid one reaction with water_________________?


aPCI5

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bP2O3

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cP2O5

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dAll of the above

✓


View Answer All of the above

SO3 is not absorbed in water directly because__________________?


aReaction is exothermic

✓


bIt is insoluble in water

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cDilute acid is produced

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dall of the above

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Compounds of nitrogen and phosphorus are mostly________________?


aionic

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bcovalent

✓


cpolar

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dall varieties are possible

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View Answer covalent

Which of the following is different with respect to physical appearance ?


aArsenic

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bPhosphorus

✓


cAntimony

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dBismuth

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View Answer Phosphorus

Which element can form tripositive ion ?


aBeryllium

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bcarbon

✖


csilicon

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dAluminium

✓


View Answer Aluminium

Boric acid cannot be used__________________?


aAs antiseptic in medicine

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bFor washing eyes

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cIn soda bottles

✓


dFor enamel and glazes

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View Answer In soda bottles

Identify the correct statement regarding CO_______________?


ait combines with H2O to form carbonic acid

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bit reacts with red blood cells of haemoglobin

✓


cit is powerful oxidizing agent

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dit is used to prepare aerated drinks

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CO2 is gas while SiO2 is solid at room temperature?


acarbon is non-metal while silicon is semi-metal

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bCO2 is an independent molecule while SiO2 has network covalent structure

✓


cCO2 forms multiple bond while silicon does not form multiple bonds

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dSilicon has all sigma bonds

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Which of the following is not a use of silicon ?


aLubricants

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bHydraulic brakes

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cAntifreeze

✓


dWater repellent

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View Answer Antifreeze

Aqueous solution of borax above 62°C gives crystals of________________?


aNa2B4O7.4H2O

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bNa2B4O7.5H2O

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cNa2B4O7.2H2O

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dNa2B4O7.10H2O

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View Answer Na2B4O7.5H2O

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