Q.6 SHORT ANSWER ( ANY 3 ) [ 6M ] 1. Why do we use mercury in the thermometer in place of water?
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2. In places of hot climate it is advised that the outer walls of houses be painted white Explain.
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3. Name the source from which litmus solution is obtained. What is the use of this solution?
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4. What are neutral substances?
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Answer:
1) We use mercury in thermometers as they remain in liquid form even with a change of temperature in it.
2. A small change in the temperature causes change in volume of a liquid.
3. Water cannot be used as a thermometric liquid, because it is not helpful to measure below 0°C and above 100°C.
4. Water is transparent. So it makes the reading of the scales of the thermometer more difficult, water wets the glass tube so its steady is glass tube.
I hope this will help you.
Answer:
1)We use mercury in thermometers because most metals are good conductor of heat and mercury is the only metal in liquid state. ... No,we cannot use water instead of mercury because water do not expand as per temperature given to it and can give us wrong reading
2)In places of hot climate, it is advised that the outer walls of house be painted white because white colour does not absorb any heat radiation from the sun which keep inside cool even if there is hot climate outside the house
3) Litmus solution is extracted from lichens. It is used as an indicator to distinguish between bases & acids.
4 ) Neutral substances are neither acidic nor basic. An acid has the hydrogen ions and the base has the hydroxyl ions so on this basis neutral substances have equal no. of these ions. The most common example of neutral substance is water.
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