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प्रश्न
Fill in the blank
A metal that gives dazzling effect to crackers when they explode is ______
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उत्तर
A metal that gives dazzling effect to crackers when they explode is magnesium.
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संबंधित प्रश्न
State one use of Silver.
Fill in the following blank with suitable word:
The electrical conductivity and melting point of an alloy is ........... than that of pure metals.
What elements are present in steel? How are the properties of steel different from those of pure iron?
Give reasons
Gold is mixed with copper and nickel.
Write ‘true’ or ‘false’ for the following statement.
Iodine acts as an antiseptic in the form of a tincture of iodine.
Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride
Salt of silver, such as ________ is used for making photographic films.
Name a metal which is not malleable :
Name a metal which is best conductor of electricity :
State two important uses of following metal:
Uses of silver
State two important uses of following metal
Uses of tin
State two important uses of following metal
Uses of lead
Write name.
Molecular formula of the common ore of aluminium.
Write name.
The nonmetal having electrical conductivity.
Write scientific reason.
Anodes need to be replaced from time to time during the electrolysis of alumina.
Molecular formula of the chloride of an element X is XCl. This compound is a solid having high melting point. Write name of any element present in the same group as X
Give a reason why a green deposit is seen on the surface of an article of copper
State a specific reason for using copper in electrical cables
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.
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.
Metals have high melting points.
