Q. 125.0( 4 Votes )

Complete the missing components/variables given as x and y in the following reactions:

(a) Pb(NO3)2(aq) + 2Kl(aq) PbI2(x) + 2KNO3(y)

(b) Cu(s) + 2AgNO3(aq) Cu(NO3)2(aq) + x

(c) Zn(s) + H2SO4(aq) ZnSO4(x) + H2(y)

(d) CaCO3(s) CaO(s) + CO2 (g)

Answer :

(a) Pb(NO3)2(aq) + 2Kl(aq) PbI2(s) + 2KNO3(aq)

Hence, x is (s) and y is (aq) (s) means PbI2 exists in solid state and (y) means that KNO3 exists in aqueous/liquid state.


(b) Cu(s) + 2AgNO3(aq) Cu(NO3)2(aq) + 2Ag(s)


Hence, x is Ag(s) In the above reaction, Ag gets replaced by Cu.


(c) Zn(s) + H2SO4(aq) ZnSO4(aq) + H2(g)


Hence, x is (aq) and y is (g) (aq) means copper sulphate formed exists in aqueous state. (g) means hydrogen gas is liberating.


(d)


Hence x is heat


When CaCO3 is heated in the presence of oxygen, it forms calcium oxide (CaO) and carbon dioxide.


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