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प्रश्न
Name a metal as precious as gold
उत्तर
Platinum
APPEARS IN
संबंधित प्रश्न
Give an example of a metal which is a poor conductor of heat.
State any five physical properties of a non-metal.
Define metal and non-metal on the basis of electron loss or gain.
`Mg +H_2SO_4 → —+ — `
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. |
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?
Which metal occurs as a sulphide also gives the name of their respective ore.
Which metal occurs as an oxide also gives the name of their respective ore.
Give the common name and chemical name of an ore of:
(a) zinc (b) aluminium (c) iron.
Give a reason why – properties of metals are related to their activity or reactivity series of metals. Explain the same with reference to potassium and iron in the series.
Complete the statement given below, by filling in the blank with the correct word:
A non-metal that leaves a mark on paper _______
Write the name.
Nonmetal which is a good conductors of electricity.
Identify who I am!
Amphoteric oxide forming metal- _______
Distinguish between:
Metals - Nonmetals (physical characteristics)
Non-metals are non-malleable.
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?
Which non-metal is essential for our life and all living beings inhale it during breathing?
