Q1 of 10 Page 142

Arrange the objects as shown in the figure and conduct the experiment. Based on your observations, what is the conclusion that you reach at?

When we will pass the current through lead pencil then it will conduct due to presence of free electrons in lead because lead is made up of graphite. And graphite is a good conductor of electricity. So the bulb will glow on passing the current.


More from this chapter

All 10 →
4

Write the chemical formula of the compounds that are missing in the homologues series given below.

A


B


C

5

Given below are the chemical formulae of some hydrocarbons

C3H6, C2H6, C3H4


a) Represent their structure


b) Based on their structure, classify them into alkane, alkene and alkyne.

 2

Lighted candles of different heights are arranged in a trough as shown in the figure. Pour a

saturated solution of sodium bicarbonate (baking soda) into the trough. Add a little vinegar to the solution. What do you observe? Give reasons for the observation.


 3

Making a fire extinguisher.

Arrange the apparatus as shown in Figure (a). Add the vinegar contained in the test tube to the sodium bicarbonate (baking soda) solution (Figure (b)) by tilting the wash bottle. Introduce the resultant gas to a candle flame. Record your observation. What is your inference?