Chemistry MCQs

Page No. 31

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


aPCI5


bP2O3


cP2O5


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


cDilute acid is produced


dall of the above



Compounds of nitrogen and phosphorus are mostly________________?


aionic


bcovalent


cpolar


dall varieties are possible


View Answer covalent

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


aArsenic


bPhosphorus


cAntimony


dBismuth


View Answer Phosphorus

Which element can form tripositive ion ?


aBeryllium


bcarbon


csilicon


dAluminium


View Answer Aluminium

Boric acid cannot be used__________________?


aAs antiseptic in medicine


bFor washing eyes


cIn soda bottles


dFor enamel and glazes


View Answer In soda bottles

Identify the correct statement regarding CO_______________?


ait combines with H2O to form carbonic acid


bit reacts with red blood cells of haemoglobin


cit is powerful oxidizing agent


dit is used to prepare aerated drinks



CO2 is gas while SiO2 is solid at room temperature?


acarbon is non-metal while silicon is semi-metal


bCO2 is an independent molecule while SiO2 has network covalent structure


cCO2 forms multiple bond while silicon does not form multiple bonds


dSilicon has all sigma bonds



Which of the following is not a use of silicon ?


aLubricants


bHydraulic brakes


cAntifreeze


dWater repellent


View Answer Antifreeze

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


aNa2B4O7.4H2O


bNa2B4O7.5H2O


cNa2B4O7.2H2O


dNa2B4O7.10H2O


View Answer Na2B4O7.5H2O

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