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Q. 3. Redraw the diagram given in your answer book and show the direction of the light ray afterreflection from the mirror.

Ans

Q. 4. What is meant by a saturated hydrocarbon? 1

Ans. A saturated hydrocarbon is a hydrocarbon in which the carbon atoms are connected by only a single bond.

Q. 5. Chlorine, bromine and iodine form a Dobereiner’s triad. The atomic masses of chlorine and iodine are 35·5 and 126·9 respectively. Predict the atomic mass of bromine. 1

Ans.

Element of the triad Symbol Atomic masses
1. Chlorine Cl 35·5
2. Bromine Br ?
3. Iodine I 126·9

According to Dobereiner’s triad, the atomic mass of bromine is the arithmetic mean of Cl and I.

Atomic mass of Br =

Science 2009 Question Papers Class X
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