Q15 of 53 Page 1

Draw the ray diagram and also state the position, the relative size and the nature of image formed by a concave mirror when the object is placed at the center of curvature of the mirror.

When the object is placed at the center of curvature of a concave mirror, i.e., point C, The image will be formed at center of curvature only. The image will be real, inverted and of same size as that of the object.


The ray diagram when object is at center of curvature will be as follows:


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Write one chemical equation to represent each of the following types of reactions of organic substances:

(i) Esterification


(ii) Saponification


(iii) Substitution

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Two elements X and Y belong to group 1 and 2 respectively in the same period of periodic table. Compare them with respect to:

(i) the number of valence electrons in their atoms;


(ii) their valences;


(iii) metallic character;


(iv) the sizes of their atoms;


(v) the formulae of their oxides;


(vi) the formulae or their chlorides.

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