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प्रश्न
Name the following:
An Alloy of copper and Zinc.
उत्तर
Brass
APPEARS IN
संबंधित प्रश्न
Some properties are listed in the following Table. Distinguish between metals and non-metals on the basis of these properties
| Properties | Metals | Non-metals |
| 1. Appearance | Lustrous | Dull |
| 2. Hardness | Hard | Soft |
| 3. Malleability | Can be beaten into thin sheets | Cannot be beaten into thin sheets |
| 4. Ductility | Can be drawn into wires | Cannot be drawn into wires |
| 5. Heat Conduction | Good conductors of heat | Poor conductors of heat |
| 6. Conduction of Electricity | Good conductors of electricity | Poor conductors of electricity |
Give reasons for the following.
Aluminium foils are used to wrap food items.
Why are metals used for making cooking vessels?
Give the name and formulae of two basic oxides.
Tick (√) the most appropriate answer.
A metal which is a poor conductor of electricity is:
Why are alloys made?
Name:
a non metal which can form a positive ion
Explain how the activity series accounts for the following:
occurrence of metals
Give the balanced reactions for the following:
Sodium is dropped in water
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 |
Make pairs of substances and their properties
| Substance | Property |
| a. Potassium bromide (KBr) | 1. Combustible |
| b. Gold | 2. Soluble in water |
| c. Sulphur | 3. No chemical reaction |
| d. Neon | 4. High ductility. |
Name two metalloids.
Differentiate between metals and non-metals with reference to –
(a) number of electrons in outer or valence shell
(b) formation of cation and anion
(c) reaction with dilute acids.
Select the appropriate option for the following statement:
The element which shows properties of both metals and non-metals.
Find the odd one out and give its explanation.
A form of non-metal which has high ductility is
Non-metals form covalent chlorides because ____________.
The metal is stored in kerosene ______.
Reason out
Sulphur is used in the vulcanization of rubber.
