• Chemistry - Section 1
56. 

The hardest form of carbon is

A. coke
B.

सीसा

C.

हीरा

D.

लकड़ी का कोयला


57. 

The most important ore of aluminium is

A. bauxite
B.

मैग्नेटाइट

C.

हेमटैट

D.

मोनाजाइट 


58. 

The number of electrons presents in H+ is

A. zero
B.

एक 

C.

दो 

D.

तीन 


59. 

The human body is made up of several chemical elements; the element present in the highest proportion (65%) in the body is

A. carbon
B.

हाइड्रोजन

C.

ऑक्सीजन

D.

नाइट्रोजन


60. 

The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is

A. chain isomerism
B.

कार्यात्मक समूह िस्रोमेरिस्म 

C.

स्थितीय आइसोमेरिज़्म

D.

मेंतामेरिस्म