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प्रश्न
Name a non-metal that is used to kill germs in water
उत्तर
Chlorine
APPEARS IN
संबंधित प्रश्न
Choose the most appropriate answer of the following:
This is not an alloy of copper:
(A) Brass
(B) Bronze
(C) Solder
(D) Duralumin.
Write a balanced chemical equation for the reaction of zinc with potassium hydroxide solution.
Give the name and formulae of two acidic oxides.
What is meant by "brittleness"? Which type of elements usually show brittleness: metals or non-metals?
What is the nature of the oxide SO2? What happens when it is dissolved in water? Write the chemical equation of the reaction involved.
State five uses of non-metals.
Name two physical properties of carbon in which it's behaviour is not as expected from it's classification as non-metal.
Define non-metals. Give five examples of non-metals.
State three reasons (of which at least one must be chemical) for believing that sulphur is a non-metal.
What are metalloids: Give examples.
Name:
a metal which is brittle
Give a short account of heating effect on metal carbonates based on the activity series ?
The table below compares some properties of metals and non-metals. Write down the missing
statements (i) to (iv) :
| Metals | Non-metals |
| (i) ………………….. | Poor conductors of heat |
| (ii) Malleable | …………………… |
| (iii) Form positive ions | …………………… |
| (iv) ………………… | Form acidic oxides |
Why do gold ornaments look new even after several years of use?
Name the following:
or
With reference to the physical properties of metals and non-metals, state the following exception.
A metal which is liquid at room temperature.
Gold and silver are used to make jewellery. Give reason
Select the appropriate option for the following statement:
The element which is noble gas and radioactive in nature.
Generally, non-metals are not lustrous. Which of the following non-metal is lustrous?
Paheli bought a statue made up of copper. To her surprise, it acquired a dull green coating after a couple of months. Explain the reason.
