21. The gas produced in marshy places due to decomposition of vegetation is
22. Organic compounds are
23. Vinegar is an aqueous solution of
24. Two elements which can form a large number of compounds are
25. Alcoholic (– OH) group can be identified by :
26. Which one is the simplest form of alkane?
27. Which of the following is not a natural source of hydrocarbon?
28. The element with highest first ionisation energy is
29. In a period from Li to F, ionisation potential
30. In the periodic table of elements, on moving from left to right across a period, the atomic radius
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