Question

Permanent magnets are generally made of alloys of

Solution

Correct option is

Co

Permanent magnets are generally made up of alloys of Al, Ni and Co.

SIMILAR QUESTIONS

Q1

In industrial smog, Cu corrodes to

Q2

IE1 of Cu (3d10 4s1) is less than that of Zn (3d10 4s2) because it is easy to remove an electron from a half-filled s-orbital as compared to fully-filled s-orbital. However, in case of IE2, the electron is lost from 3d orbital of Cu and 4s orbital of Zn and loss of electron from 4s orbital is easier as compared to fully-filled 3d orbital.

Q3

 

An inorganic compound (A) gave the following reactions

(i) The compound on heating gave a residue and a gaseous mixture of NO2and O2.

(ii) The aqueous solution of (A) gave a white precipitate with sodium chloride solution. The precipitate dissolves in NH4OH. The compound (A) is

Q4

Silver nitrate produces a black strain on skin due to

Q5

A metal, M which is not affected by strong acids and strong bases but dissolves in aqua-regia forms MCl3 which is used for toning in photography. The metal M is

Q6

Transition elements exhibits variable valencies because they release electrons from the following orbits

Q7

The transition elements are more metallic than the representative elements because they have

Q8

Which forms interstitial compounds?

Q9

Which oxide of manganese is amphoteric?

Q10

Among the following pair of ions, the lower oxidation state in aqueous solution is more stable in