Tag: d and f block elements

Questions Related to d and f block elements

Interstitial compounds are formed when small atoms are trapped inside the crystal lattice of
metals. Which of the following is not the characteristic property of interstitial compounds?

  1. They have high melting points in comparison to pure metals.

  2. They are very hard.

  3. They retain metallic conductivity.

  4. They are chemically very reactive.


Correct Option: D
Explanation:
Interstitial compounds have high melting points in comparison to pure metals. They are very hard and retain metallic conductivity. They are chemically inert i.e. not reactive.

Which of the following is incorrect about interstitial compounds?

  1. Very reactive

  2. High metallic conductivity

  3. Very hard

  4. High melting point


Correct Option: A
Explanation:

Interstital compound are almost inert so (A) is wrong statement.

Which forms interstitial compounds?

  1. $Fe$

  2. $Co$

  3. $Ni$

  4. All


Correct Option: D
Explanation:

A interstitial compound has ions or atoms of a nonmetal occupy interstitial positions in a metal lattice. All of the three transition metal mentioned above have the tendency to form interstitial compounds.

Addition of non-metals like B and C to the interstitial sites of a transition metal results the metal :

  1. of more ductability

  2. of less ductability

  3. Less malleable

  4. of more hardness


Correct Option: B,C,D
Explanation:

Addition of non-metals like B and C to the interstitial sites of a transition metal results in the  more hardness so it will be less ductile and less malleable.
Hence options B,C & D are correct.

German silver is a mixture of :

  1. copper and zinc

  2. copper and tin

  3. copper, nickel and zinc

  4. aluminium, copper and traces of Mg and Mn


Correct Option: C
Explanation:

German silver is a mixture approximately 60% of Cu, 20% of Zn  and 20% of Ni.

Stainless steel contains:

  1. Cu and Zn

  2. Cu and Sn

  3. Pb and Sn

  4. Fe, C, Cr and Ni


Correct Option: D
Explanation:

Stainless steel is a metal alloy made up of steel mixed with elements such as chromium, nickel, molybdenum, silicon, aluminium, and carbon. 


Iron mixed with carbon to produce steel is the main component of stainless steel. Chromium is added to make it resistant to rust.

Coil present in electrical water heater made up which alloy:

  1. Nichrome

  2. Steel

  3. Brass

  4. Aluminium bronze


Correct Option: A
Explanation:

An alloy of nickel & chromium (Nichrome) is used in electrical water heater because of its high heating property. 


Option A is correct.

Aluminium appears like gold when mixed with :

  1. 90 % Cu

  2. 75 % Ni

  3. 80 % Sn

  4. 80 % Co


Correct Option: A
Explanation:

Aluminium reacts with 90 % Cu and appears like gold. It is known as rolled gold.