In which of the following pairs, the two substances forming the pair are chemically most dissimilar?
A Sugar and paper
B Butter and paraffin wax
C Chalk and marble
D Charcoal and diamond
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The agent which is oxidized in photosynthesis is
A Sunlight
B Carbon dioxide
C Water
D Chlorophyll
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
A 3 billion years
B 100 years
C 0.01 minute
D 13 days
The high reactivity of fluorine is due to
A Its high electro negativity
B Small size of fluorine atom
C Availability of d-orbitals
D Strong F - F bond
The formula C6H5-CO-CH3 represents
A Acetone
B Acetic acid
C Acetophenone
D Phenyl acetate
The names of the scientists, New lands, Mendeleev, and Meyer are associated with the development of
A Atomic structure
B Metallurgy
C Periodic table of contents
D Discovery of elements
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