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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
Fill in the blanks:
Metals react with acids to produce _________ gas.
State one use of Aluminium.
Which property of 'solder' alloy makes it suitable for welding electrical wires?
What is meant by 22 carat gold? Name the metals which are usually alloyed with gold to make it harder.
Which of the following alloys contains mercury as one of the constituents?
(a) stainless steel
(b) solder
(c) duralumin
(d) zinc amalgam
State two important uses of following metal
Uses of mercury
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
Write name.
The reagent that dissolves noble metals.
Give reasons for the following:
Most metals conduct electricity well.
With reference to the following metals state their use in daily life metal:
Silver
Give a reason why iron objects rust easily but the iron pillar at Qutab Minar has not rusted over the years.
Match the columns.
| Group A | Group B |
| 1) Copper and Zinc | a) Brass |
| 2) Copper and Tin | b) Bronze |
| c) Stainless steel |
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.
Generally, metals are solid in nature. Which one of the following metals is found in a liquid state at room temperature?
Metals are ______ conductors of heat and electricity.
Which metal has the highest ductility?
Why do metals appear shiny?
Compare the conductivity of metals and non–metals.
