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प्रश्न
Tick (√) the most appropriate answer.
Graphite is used :
पर्याय
for sterilisation of water
for making stainless steel
as dry lubricant
in making electric bulbs
उत्तर
as dry lubricant
APPEARS IN
संबंधित प्रश्न
Fill in the blanks:
Metals react with acids to produce _________ gas.
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Generally, non-metals react with acids. ( )
How are the properties of an alloy different from those of the constitutent elements?
Fill in the blank
A metal that gives dazzling effect to crackers when they explode is ______
State two important uses of following metal
Uses of magnesium
State the position of the following in the periodic table:
Alkaline earth metals
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Oxygen
Write name.
Alloy of sodium with mercury.
When a copper coin is dipped in silver nitrate solution, a glitter appears on the coin after some time. Why does this happen? Write the chemical equation.
Soft metal : Na : : hard metal : _______
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.
Complete the following flow chart.
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.
Assertion: Mercury is solid in room temperature.
Reason: Mercury is a non-metal.
Give reasons for the following.
- Aluminum foils are used to wrap food items.
- Immersion rods for heating liquids are made up of metallic substances.
- Sodium and potassium are stored in kerosene.
- Mercury is used in thermometers.
Give an example of a metal which
- is liquid at room temperature.
- is the best conductor of heat.
Which of the following is not a metal?
Which of the following metals can displace the other two metals from their salt solutions?
| Zinc | iron | copper |
The metals which are found in both free state as well as combined state are ______.
