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प्रश्न
Give reasons
Magnesium is used in fire works.
उत्तर
Magnesium is used in fire works because it bums with a dazzling light.
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संबंधित प्रश्न
Fill in the blanks:
Metals react with acids to produce _________ gas.
Give a reason for Alkali metals are good reducing agents.
Give the composition of an alloy called solder. State its one property and one use.
How are the properties of an alloy different from those of the constitutent elements?
Give reasons
Aluminium is used in making aircrafts.
Give reasons
Graphite is used in the leads of pencils
Give two uses of Germanium
Tick (√) the most appropriate answer.
Graphite is used :
State two important uses of following metal
Uses of copper
State two important uses of following metal
Uses of tin
State the position of the following in the periodic table:
Iron and zinc
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Oxygen
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Sulphuric acid
Why are alkali metals kept in kerosene oil?
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
Soft metal : Na : : hard metal : _______
Halogen reacts with acid.
Give an example of a metal which
- is liquid at room temperature.
- is the best conductor of heat.
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
______ is the reducing agent.
