metals, non metals, minerals, ores, properties, uses - Category wise Question and Answer Practice Test with Solutions

Question : 21

Chemically rust is

a) ferric oxide only

b) hydrated ferric oxide only

c) hydrated ferrous oxide only

d) ferrous oxide only

Question : 22 [CDS]

What are the elements which are liquids at room temperature and standard pressure?

1. Helium
2. Mercury
3. Chlorine
4. Bromine

a) 2, 3 and 4

b) 2 and 4

c) 2 and 3

d) 1 and 3

Question : 23 [IAS (Pre) 2003]

Which one of the following statements is correct?

a) Calcium carbonate is an ingredient of toothpaste

b) Bordeaux mixture consists of sodium sulphate and lime

c) Liquid sodium is employed as a coolant in nuclear reactors

d) Zinc amalgams are used as a dental filling

Question : 24

A non metal that catches fire at room temperature is-

a) Sulphur

b) Phosphorus

c) Sodium

d) Fluorine

Question : 25

Which of the following non-metals has shining lustrous surfaces?

a) Graphite and iodine

b) Iodine and phosphorus

c) Graphite and phosphorus

d) Phosphorus and chlorine