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10th carbon and its compounds solved paper-1 sample paper

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Aastha Mishra
YMCA Centenary School
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10th Carbon and Its Compounds Solved Paper-1 Q.1 Why is carbon tetravalent? Ans 1: Carbon atom has 4 electrons in the outermost shell.It needs 4 more electrons to complete its octet. Therefore, carbon is tetravalent. Q.2 The formula of a hydrocarbon is Cn H2n. Name the family to which it belongs and also predict its nature. Ans 2: The hydrocarbon belongs to alkenes It is unsaturated in nature. Q.3 What is the valency of carbon in CH3-CH3, CH2=CH2 and HC=CH ? Ans 3: The valency of carbon in all its compounds whether saturated or unsaturated is 4. Q.4 Out of butter and ground nut oil , which is unsaturated in Nature? Ans 4: Groundnut oil is unsaturated in nature . Q.5 Why is high temperature not favourable for alcoholic fermentation? Ans 5: The high temperature destroys the enzymes which are needed to carry fermentation . Q.6 Name a cyclic unsaturated hydrocarbon, containing three double bonds? Ans 6: Benzene Q.7 What is the difference in the molecular mass of any two adjacent homologues? Ans 7 : 14 mass units. Q.8 Which has triple bond ; C2H4 ,C3H6 and C3H4 ? Ans 8:C3H4 has triple bond in the formula . Q.9 Which substance is added to denature ethyl alcohol? Ans 9: A small amount of methyl alcohol , pyridine or copper sulphate is added to denature ethyl alcohol . Q.10 Which ions are responsible for making water hard ? File downloaded from: http://cbseadda.blogspot.com/ Page 1

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