Question Detail

The luster of a metal is due to :

high polishing
high density
chemical inertness
presence of free electrons

Answer: Option D

Similar Questions :

1. The most electronegative element among the following is

sodium
bromine
fluorine
oxygen

Answer: Option C

2. A catalyst is a substance which

increases the activation energy
increases the rate of reaction and increases the equilibrium concentration of products
changes the equilibrium of a reaction so that the concentration of the product increases
hastens the attainment of equilibrium

Answer: Option D

3. Mass number of a nucleus is :

the sum of the number of protons and neutrons present in the nucleus
always more than the atomic weight
always less than its atomic number
None of above

Answer: Option A

4. Identify the wrong statement in the following

Atomic radius of the elements increases as one moves down the first group of the periodic table
Atomic radius of the elements decreases as one moves across from left to right in the 2nd period of the
Amongst isoelectronic species, smaller the positive charge on the cation, smaller is the ionic radius
Amongst isoelectronic species, greater the negative charge on the anion, larger is the ionic radius

Answer: Option C

5. The metallurgical process in which a metal is obtained in a fused state is called ?

roasting
calcinations
smelting
froth floatation

Answer: Option C

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