CHEMISTRY 9

The elements having highest Ionization energy is

• Oxygen

• Berylium

• Nitrogen

• Boron

Diamond is an allotrope of

• Oxygen

• Carbon

• Phoshorous

• SULPHUR

If the PH value of solution increases from 7 to 14 the solution will becomes

• Acidic

• Alkaline

• Neutral

• None of above

The reaction AgNO3+NaCl gives AgCl+NaNO3 is called

• Decomposition

• Double displacement

• Combination

• Substitution

Pentane has ....... number of chain isomers

• One

• Two

• Three

• Four

The metalic sound produced by pre-ignition of fuel is called

• Knocking

• Antiknocking

• Cracking

• Reforming

What is the another name of quick lime

• Calcium carbonate

• Calcium oxide

• Clacium hydroxide

• Calcium sulphate

What is the oxidation number of Co in Co(CO)5

• Zero

• +5

• -5

• +3

Which of the following gas is used to make blue print map

• Carbondioxide

• Oxxygen

• Hydreogen

• Ammonia

The oxidation number of Fe in Ferrosoferric oxide is

• +2,+3

• +8/3

• +3

• Both a and b