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प्रश्न
Tick (√) the most appropriate answer.
Copper metal is used in :
विकल्प
making electric wires
filling tooth cavities
making fuse wires
preparation of hydrogen
उत्तर
making electric wires
APPEARS IN
संबंधित प्रश्न
Fill in the blanks:
Metals are ________ conductors of heat and _________.
Name two non-metals which are both brittle and non-ductile.
Which property of copper metal is utilised in making thin wires?
State five uses of non-metals.
Name the metal which is used in making thermometers.
Name the metal which is the best conductor of heat and electricity.
The electronic configurations of three elements A, B and C are as follows:
| A | 2, 8, 1 |
| B | 2, 8, 7 |
| C | 2, 4 |
(a) Which of these element is a metal?
(b) Which of these elements are non-metals?
(c) Which two elements will combine to form an ionic bond?
(d) Which two elements will combine to form a covalent bond?
(e) Which element will form an anion of valency 1?
Statements given below are incorrect. Write the correct statements :
Chlorine gas is used in the manufacture of sulphuric acid.
What are metalloids: Give examples.
Name:
two metallic oxides which are acidic
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 |
How many valence electrons are present in:
(ii) non-metals?
Write scientific reason.
Sodium metal is kept in kerosene.
Describe a simple experiment to prove that a copper wire conducts electricity, but a piece of coal does not.
Give reason for the following:
Metals form cations while non-metals form anions.
Select the appropriate option for the following statement:
The element which shows properties of both metals and non-metals.
Which non-metal is essential for our life and all living beings?
Non-metals form covalent chlorides because ____________.
Match the following:
| 1. | Non-metals | a. | Silicon |
| 2. | Metals | b. | fire extinguisher |
| 3. | Metalloids | c. | dull and soft |
| 4. | Oxygen | d. | hard and shiny |
| 5. | Water | e. | supports fire |
