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1. The main active constituent of tea and coffee is

nicotine chlorophyll caffeine aspirin
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2. The iron ore magnetite consists of

Fe2O3 Fe3OH4 FeCO3 3Fe2O3 .. 3H2O
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3. The mass of one avogadro number of helium atom is

1.00 gram 4.00 gram 8.00 gram 4 x 6.02 x 1023 gram
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4. The main use of salt in the diet is to

make the taste of food better produce in small amounts the hydrochloric acid required for the digestion of food ease the process of cooking increase the solubility of food particles in water
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5. The number of g-molecule of oxygen in 6.02 x 1024CO molecules is

1 gram of molecule 0.5 gram of molecule 5 gram of molecule 10 gram of molecule
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6. The number of waves made by an electron moving in an orbit having maximum magnetic quantum number is +3

4 5 2 zero
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7. The octane number of zero is assigned to

2-methyl octane n-heptane iso-octane 3-methyl octane
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8. The molecule which has the highest percentage of ionic character among the following is

HI HF HCI HBr
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9. The isomerism which exists between CH3CHCI2 and CH2CI. CH2CI is

chain isomerism functional group isomerism positional isomerism metamerism
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10. The organic reaction represented by equation CH3 - CH = O + H2NOH gives CH3 - CH - NH + H2O is an example of

an addition reaction a condensation reaction an oxidation reaction an elimination reaction
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