10.Classify the following compounds diatomic, triatomic and polyatomic
molecules: HCl,H2,H2O,NH3,CH3OH,PCl5
11.Write the correct symbols of the following elements which are written
incorrectly. (i) FE (Iron) (ii) AL (Aluminium) (iii) CO (Cobalt) (iv) AG (silver)
(v) NA (sodium) (vi) AR (Argon)
12.If an element X has its valency equal to 3,what will be its formula with
carbonate ion?
13. Give two examples for positive work done
14. Say true or false:
(a) Work done by a body against friction results in a loss of potential energy.
(b) The work done by the force of gravity on moon moving round the earth is zero.
15. Define unit of work.
16. Define notochord.
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it's too very big please write one by one
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