SCIENCE—X FOR 2009-2010
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SCIENCE—X FOR 2009-2010
Subject –Chemistry(PERIODIC CLASSIFICATION OF ELEMENTS)
PAPER SET-1
Q1 In which form matter is present around us?
Q2 Define element.
Q3 At present, how many elements are known to us?
Q4 The earliest attempt in classifying elements resulted in the formation of two groups of elements. What are they?
Q5 Who made the first attempt of classifying elements?
Q6 On what basis Döbereiner classified elements?
Q7 Döbereiner classified elements into how many groups?
Q8 What name was given to Döbereiner groups?
Q9 What is the total number of elements in Döbereiner groups?
Q10 How did John Newlands classify elements?
Q11 Name the first element of Newland’s octaves.</p