Question

There are four metals K, L, M and N identify them by using the hints given below
K forms basic oxide, L forms amphoteric oxide, Oxide of M dissolves in water to
form alkali, N does not react with water at all.
a) K= K, L= Ca, M= Al, N=Fe b) K= K, L= Al, M= Na, N= Fe
c) K=Fe, L=Al, M=Ca, N= Na d) K= Ca, L=Fe, M=Na, N=Pb

Answer 1

Answer:

C OPTION IS THE CORRECT ANSWER

Answer 2

The four metals K, L, M, and N are identified by using the hints given as follows: d) K= Ca, L=Fe, M=Na, N=Pb

• It is given that K forms a basic oxide. Hence, K is a metal. In all the options, however, K is representing a metal.
• L forms an amphoteric oxide. Thus, L is also a metal, but it can form both acidic or basic oxides. Calcium will not produce amphoteric oxide; its oxide is basic in nature. Iron can also form amphoteric oxide. Thus, option (a) is eliminated.
• It is given that N does not react with water. This shows that the N has very low reactivity. Amongst the given options, iron will not react with hot water too, but it can react with steam. While sodium can react even with cold water. Lead, copper, silver, and gold are metals that do not react with water at all. Thus, N can be lead, i.e., Pb.