Metals And Non-...

Which of the following statements are correct?

1. Metalloids are called semi-metals.
2. Metalloids are used as semi-conductors.
3. Metalloids are impure metals.
4. Metalloids are pure non-metals.

Which of the following statements is incorrect?

Transition metals exhibit properties like high melting point and high tensile strength because

'X' and 'Y' are examples of acidic and neutral non-metallic oxides.

Choose from the options given below, the one that is a suitable illustration of 'X' and 'Y'.

Match Column - A (non-metal) with Column - B (with their uses).
 

Consider the following physical properties:

(i) Low melting and boiling points
(ii) Formation of alloys and amalgams
(iii) Highly lustrous
(iv) Non-conductor of heat and electricity
(v) Low density

Which of the given physical properties are shown by sulphur and phosphorus?

Metals have free electrons in their valence shells, and show electrical and thermal conductance. Which of the following elements is a poor conductor of electricity?

Which of the following represents the pairs of metalloids?

(a) Si and Sb
(b) Pb and Sb
(c) Ru and Rh
(d) Ge and As

Metals are electropositive elements and their reactivity depends on their ability to lose one or more of their valence electrons. Which of the following properties is expected to increase the reactivity of the metals?