51) Elements that show the properties of both metals and non metals are called ?
a)metalloids
b)allotropes
c)alloys
d)colloids
52) What is used to avoid melting of ice ?
a)Gelatine
b)Butane
c)Methane
d)Any acid
53) The high reactivity of fluorine is due to ?
a)small size of fluorine atom
b)its high electro negativity
c)availability of d-orbitals
d)strong F – F bond
54) Which one of the following metals does not react with water to produce Hydrogen?
a)Cadmium
b)Lithium
c)Potassium
d)Sodium
55) Air is a
a)compound
b)colloid
c)element
d)mixture
56) What is metallurgy ?
a)process of extracting metal in pure form from its ore.
b)process of creating alloys of metals.
c)process of making metals live long.
d)None of above.
57) The oxide of Nitrogen used in medicine as anaesthetic is ?
a)Nitrogen pentoxide
b)Nitrous oxide
c)Nitric oxide
d)Nitrogen dioxide
58) Petroleum is found in ?
a)Marshy land
b)Metamorphic rocks
c)Igneous rock
d)Sedimentary rocks
59) The major component used in preparation of different types of glasses is :
a)Sodium borate
b)Sodium silicate
c)Silica
d)Calcium silicate
60) Aspirin is
a)acetyl salicylic acid
b)sodium salicylate
c)methyl salicylate
d)ethyl salicylate
Best Wishes For The All Candidates!!