Consider the reaction below. which species are conjugate acid/base pairs? h2so3 (aq) + cn (aq) hso3 (aq)hcn (aq) a) hso3, cn b) hso3, h2so3 c) h2so 3, cn d) hcn, h2so

Answer : The correct option is, (B)

Explanation :

According to the Bronsted Lowry concept, Bronsted Lowry-acid is a substance that donates one or more hydrogen ion in a reaction and Bronsted Lowry-base is a substance that accepts one or more hydrogen ion in a reaction.

Or we can say that, conjugate acid is proton donor and conjugate base is proton acceptor.

The given equilibrium reaction is,

Here, is loosing a proton, thus it is considered as an acid and after losing a proton, it forms which is a conjugate base. That means, are act as a conjugate acid-base pairs.

Hence, correct option is, (B)

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2