Which one of the followings possesses melting point below 0°C?
Which one of the followings possesses melting point below 0°C?
A. Nitrogen
B. Phosphorus
C. Carbon
D. Bismuth
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Covalent network crystals have_____________?
Covalent network crystals have_____________?
A. higher melting point then molecular crystals
B. lower melting point then molecular crystals
C. discrete molecules linked by Van der waals forces
D. hydrogen bondingThe number of molecules taking part in the rate determining step is called___________________?
The number of molecules taking part in the rate determining step is called___________________?A. Order of reaction
B. Rate of reaction
C. Mole of a reaction
D. Extent of a reaction50% inversion of configuration of molecules take place in a___________________?
50% inversion of configuration of molecules take place in a___________________?A. E1 – reaction
B. E2 – reaction
C. SN1 – reaction
D. SN2 – reactionTincal is a mineral of___________________?
Tincal is a mineral of___________________?A. A1
B. Si
C. B
D. CThe composition of mixture of clay and lime stone in the raw for cement material is __________________?
The composition of mixture of clay and lime stone in the raw for cement material is __________________?A. 75% lime stone and 25% clay
B. 25% lime stone and 75% clay
C. 15% lime stone and 55% clay
D. 55% lime stone and 15% clayThe carbon atom of carbonyl group is__________________?
The carbon atom of carbonyl group is__________________?A. sp hybridized
B. sp2 hybridized
C. cp3 hybridized
D. dsp2 hybridized