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प्रश्न
Statements given below are incorrect. Write the correct statements :
Aluminium is best conductor of electricity.
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उत्तर
Silver is best conductor of electricity.
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संबंधित प्रश्न
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Generally, non-metals react with acids. ( )
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Copper displaces zinc from zinc sulphate solution. ( )
What happens when Dilute sulphuric acid is poured on a copper plate?
Write word equations of the reactions involved.
Write the name and formulae of a metal hydride.
Fill in the following blank with suitable word:
The electrical conductivity and melting point of an alloy is ........... than that of pure metals.
What is an alloy? Give two examples of alloys.
Mention two uses of the following metals and non-metals
Iodine
Give reasons
Aluminium is used in making aircrafts.
Give reasons
Graphite is used in the leads of pencils
Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride
A solution of a metal in mercury is called ________
Name a metal which is best conductor of electricity :
State two important uses of following metal:
Uses of zinc
State the position of the following in the periodic table:
Alkali metals
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Oxygen
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
An amorphous substance which turns from pale green to black on strong heating evolving a colourless, acidic gas as the only gaseous product.
When a copper coin is dipped in the solution of silver nitrate, it shows a lustre on its surface. Explain this process with the help of a chemical equation.
Which one of the following is an example for a metal?
Higher Order Thinking Skills.
Aakash noticed that the metal latch on gate was difficult to open during hot sunny days. However, it was not difficult to open the same latch at night. Aakash observed that the latch and the gate are exposed to the sun during day time.
- Formulate a hypothesis based on the information provided.
- Briefly state how you would test the hypothesis.
Metals have high melting points.
The metals which are found in both free state as well as combined state are ______.
