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An organic acid �X� is a liquid which often freezes during winter time in cold countries, has the molecular formula, C2H4O2. On warming   it with ethanol in the presence of a few drops of concentrated  sulphuric acid, a compound �Y� with a sweet smell is formed   (i) Identify �X� and �Y�. (ii) Write a chemical equation for the reaction involved. (i) The organic acid X is ethanoic acid (CH 3 COOH) and The compound Y is ethyl Ethanoate CH 3 � COOH + CH 3 � CH 2 OH ---------->  (CH 3  �  C � O � CH 2 � CH 3 ) II O Write name of the following � i.   Alkaline earth metal belonging to the third period ii.   The alkali metal atom having largest atomic radius iii.   The halogen atom belonging to fourth period iv.   The element having lowest ionization energy v.   The element having second lowest electronegativity    i.   Magnesium   ii.   Franciu...

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CBSE BOARD EXAM 2014 Model sample Paper Solved Science (Physics & chemistry) Term-II 1. Give the molecular formula and IUPAC name of a carboxylic acid used as a preservative. Ans:  Ethanoic acid, CH 3 COOH 2. The ciliary muscles of a normal eye are in their : (i) most relaxed (ii) Most contracted state. In which of the two cases is the focal length of the eye lens more? Ans: The focal length of eye lens is more when the ciliary muscles of a normal eye are in their most relaxed state 3. (a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements? If yes, write the similarity. Ans: (a) Yes. The atoms of all the three elements lithium, sodium, and potassium have one electron in their outermost shell. (b) Both helium (He) and neon (Ne) have filled outermost shells. Helium has a duplet in its K shell, while neon has an octet in its L shell. (b) Helium is a non-reactive gas and neon is a g...