Advertisements
Advertisements
प्रश्न
Give an example of a metal which can be easily cut with a knife.
Name the following:
The two metals which can be cut with a knife.
उत्तर
- Sodium (Na)
- Potassium (K)
संबंधित प्रश्न
Classify the following elements into metals, non–metals and metalloids: C, Mg, Si, S, Hg, As.
One day Reeta went to a jeweller’s shop with her mother. Her mother gave an old gold jewellery to the goldsmith to polish. Next day when they brought the jewellery back, they found that there was a slight loss in its weight. Can you suggest a reason for the loss in weight?
Choose the correct answer from the options given below:
Anhydrous iron(III) chloride is prepared by:
1) direct combination
2) simple displacement
3) decomposition
4) neutralization
Name one metal and one non-metal which exist in liquid state at room temperature.
Give the name and formulae of two acidic oxides.
Name two metals which are used for making electric wires.
Name two metals which are used for making jewellery and to decorate sweets.
Name a non-metal having a very high melting point.
Which property of copper metal is utilised in making thin wires?
State any five physical properties of non-metals.
Name the metal which is the best conductor of heat and electricity.
Name a non-metal which conducts electricity.
Name the metals present in the following alloys
Bronze
Fill in the blank:
A metal stored in kerosene oil is _______
State two important uses of following non-metal
iodine
What are metalloids: Give examples.
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Neutral oxide ……………..
Name:
two metals which are soft
Why do gold ornaments look new even after several years of use?
Identify the odd term.
Three experiments to study the process of rusting are given below. Observe the three test tubes and answer the following questions.
- Why the nail in the test tube 2 is not rusted?
- Why is the nail in the test tube 1 is rusted highly?
- Would the nail in the test tube 3 get rusted?
Name two metalloids.
Fill in the Blank and Rewrite the Statements:
Elements showing properties of both metals and nonmetals are known as _________.
Match the following:
| Column A | Column B |
| (a) Helium | (1) Electric bulb |
| (b) Neon | (2) Thermometer |
| (c) Argon | (3) Semiconductor |
| (d) Germanium | (4) Weather balloons |
| (e) Mercury | (5) Advertising signboards |
With reference to the physical properties of metals and non-metals, state the following exception.
A metal which floats on water.
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_____.
Give reason for the following:
Rusting reduces the structural strength of iron.
Select the appropriate option for the following statement:
The element which is noble gas and radioactive in nature.
Tabulate the differences between metals and non-metals.
Which of the following non-metal is lustrous?
Which of the following non-metals is a liquid?
Non-metals are usually good conductors of heat and electricity.
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 |
Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is non-metal?
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.
