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प्रश्न
What do you understand by the term metal?
उत्तर
The elements which are generally hard solids, have lusture, are malleable and ductile and good conductors of heat and electricity are called metals.
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संबंधित प्रश्न
State why concentrated sulphuric acid is not used for drying ammonia gas
Name the most abundant non-metal in the earth's crust.
Name the non-metal which is used to convert vegetable oil into vegetable ghee (solid fat).
Name a metal which is so soft that it can be cut with a knife.
The electronic configurations of three elements X, Y and Z are:
| X : 2 | Y : 2, 8, 7 | Z : 2, 8, 2 |
Which of the following is correct regarding these elements?
(a) X is a metal
(b) Y is a metal
(c) Z is a non-metal
(d) Y is a non-metal and Z is a metal
Name a metal that is the best conductor of electricity
Fill in the blank
A chemical compound that makes up the striking heads of match sticks is .........................
State any five physical properties of a metal.
Physical properties of a metal :
State any five physical properties of a non-metal.
State two important uses of following non-metal
iodine
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Acidic oxide ………………
Name:
a metal which lacks ductility
Name two metals which react with cold water.
Name the following:
An Alloy of copper and Zinc.
With reference to the physical properties of metals and non-metals, state the following exception.
A non-metal which has low tensile strength
Complete the statement given below, by filling in the blank with the correct word:
The ability of a metal to produce a reasonant sound ______.
Complete the statement given below, by filling in the blank with the correct word:
A non-metal added to swimming pools to kill germs_____.
Non-metals are non-malleable.
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 |
