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(i) Which statement gives a clear meaning of Chemistry?
(ii) The mass number of an atom is determined by:
(iii)Which of the following is a metal?
(iv)Air entering the Bunsen burner barrel can be controlled by
(v) How many atoms are there in a water molecule
(vi)Which neutral atom has the same number of eletrons as Mg2+?
(vii) The appropriate extinguisher used to put off fire caused by cooking oil is:
(viii) A non-luminous flame is obtained if the hole is:
(ix)Which is the least abundant gas in the air?
(x) The process which produces energy in form of heat and light is called:
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