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प्रश्न
Name a metal which is soft and a non-metal which is hard.
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उत्तर
Sodium is a soft metal, whereas diamond is a hard non-metal.
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संबंधित प्रश्न
Name the property which enables metals to be drawn into wires.
What is meant by saying that metals are malleable and ductile?
Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine
Iron powder and sulphur powder were mixed together and divided into two parts A and B. When part A was heated strongly over a burner, then a substance C was formed. The part B was, however, not heated at all. When dilute hydrochloric acid was added to substance C, then gas D was evolved and when dilute hydrochloric acid was added to part B then gas E was evolved.
- What type of substance is B ?
- What type of substance is C ?
- Name the gas (i) D, and (ii) E ?
- State one characteristic property of gas D.
- Write one test to identify gas E.
Calculate the concentration of a solution which contains 2.5 g of salt dissolved in 50 g of water.
Define the emulsion. Give one example.
One of the following does not show Tyndall effect. This one is :
One of the following liquids will leave behind a residue on heating. This one is :
A carpenter wants to separate iron nails from saw-dust. Which method of separation should he choose ?
Describe the various steps involved in the separation of iodine, iron filings and salt from a mixture.
How is water purified on a large scale at water works ? Explain with the help of a labelled diagram. Name the substance which is added to kill germs in the drinking water supply ?
The material which is added to water during purification process at the water works so as to disinfect it is :
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
Name one pair of liquids which can be separated by using a separating funnel.
Differentiate between the-two characteristics of matter – ‘mass’ & ‘weight’.
All the matter made of ______.
Give some examples of the Tyndall effect observed in your surroundings?
Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.
Name a non-metal which exists as a liquid at room temperature.
Complete the following table:
| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
