Chemistry MCQs

Page No. 77

Any substance which accepts H+ is base favours the concept___________________?


aLowrys


bLewis


cArrhenius


dNone of these


View Answer Lowrys

Negative log of mular concentration of H+ ions is called___________________?


apH


bpOH


cpka


dpkw


View Answer pH

By the addition of base in waterpH will be_______________?


amore than 7


bless than 7


cequal to 7


dNo effect


View Answer more than 7

Catalyst used to speed up the reaction of ammonia synthesis is________________________?


aV2O5


bV2O5 and Pt


cFe


dPieces of Fe crystals are embedded in fused mixture of MgO Al2O3 and SiO2



Rate expression for ammonia synthesis is___________________?


aKc=x2/(a-x)(b-x)


bKc=x2/v(a-x)


cKc=4×2/(a-2x)2(b-x)


dKc=4x2v2/(a-x)(b-3x)3


View Answer Kc=4x2v2/(a-x)(b-3x)3

Unit of Kc is_______________?


amoles2dm+6


bmoles-2dm+6


cmoles+2dm-6


dKc may or may not have units



Conversion of reactant into product in unit time is called________________?


arate of forward reaction


brate of backward reaction


crate constant


drate co-efficient



Reaction which proceeds in both directions is called_______________?


areversible


birreversible


cspontaneous


dnon-spontaneous


View Answer reversible

Which one of the following aqueous solutions will be basic ?


aNaCl


bNa2SO4


cNa2CO3


dFeCl3


View Answer Na2CO3

For a reaction involving only gases at 25?C the equilibrium constant can be expressed in terms of molarity Ke or partial pressure Kp. Which is true about the numerical value of Kp ?


aKc is generally greater than Kp


bKc is generally less than Kp


cKc is generally equal to Kp


dKc is equal to Kp if the total moles of reactants and products are equal



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