Metals and Non Metals

What is the most abundant metalloids present in the earth

• Bromine

• Mercury

• Silicon

• Hydrogen

The minerals from which metal can be extracted conveniently and profitably is known as

• Mining sites

• ores

• cultivation sites

• Extraction sites

Bromine is only --------- which is at liquid state

• Non metal

• Metalloids

• Metal

Non metal oxides are not basic oxides

• True

• False

Solution of non metal oxide

• Turns blue litmus red

• turns red litmus blue

• shows no color change with red litmus

• shows no color change with blue litmus

The arrangement of metals in the increasing order of their reactivity is known as reactivity series

• True

• False

Rusting is an example of -----------

When zinc reacts with dilute sulphuric acid, a salt is formed with the release of a gas. The gas produced during this puts off a burning candle with a pop sound. The gas evolved during this reaction is

• sulphur dioxide

• oxygen

• hydrogen

• hydrogen sulphide

Food cans are coated with tin and not with zinc because

• zinc is costlier than tin

• zinc has a higher melting point than tin

• zinc is more reactive than tin

• zinc is less reactive than tin

Which of the following elements is used in vulcanization of rubber

• graphite

• iron

• sulphur

• magnesium