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प्रश्न
Write name.
The device used for grinding an ore.
उत्तर
The device used for grinding an ore- Ball mill
संबंधित प्रश्न
State one use of Mercury.
Give the composition of an alloy called solder. State its one property and one use.
Fill in the following blank with suitable word:
The alloy in which one of the metals is mercury is called an ...............
Give reasons
Gold is mixed with copper and nickel.
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 ________
Statements given below are incorrect. Write the correct statements :
Aluminium is best conductor of electricity.
State two important uses of following metal
Uses of copper
State two important uses of following metals:
Uses of iron
Write name.
The oxide that forms salt and water by reacting with both acid and base.
Write name.
The nonmetal having electrical conductivity.
What is it made from? Why?
Electric cables
With reference to the following metals state their use in daily life metal:
copper
With reference to the following metals state their use in daily life metal:
Lead
Electronic configuration of metal A is 2,8,1. Electronic configuration of metal B is 2,8,8,2. Which of the above metals is more reactive? Explain with reason.
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.
Why are bells made of metals?
Name two major non-metals which are present in fertilisers and enhance the growth of plants.
The metal can be cut with a knife ______.
Metals and non–metals are used for making ______, ______ and ______.
