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प्रश्न
Write ‘True’ or ‘False’ in front of following statement.
Brass is an alloy of copper and zinc and has lustrous yellow colour.
विकल्प
True
False
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उत्तर
True.
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संबंधित प्रश्न
Fill in the blanks:
Metals react with acids to produce _________ gas.
State one use of the following metal:
Copper
The atomic number of an element Y is 16.
- What must an atom of Y do to achieve the nearest inert gas electron arrangement?
- Which inert gas is nearest to Y?
Name an alloy of lead and tin.
Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula.
How does the electrical conductivity of copper alloys, brass and bronze, differ from that of pure copper?
Give reasons
Magnesium is used in fire works.
Give two uses of Germanium
Write ‘True’ or ‘False’ in front of following statement.
Magnesium is used in making light weight alloys of aluminium.
State two important uses of following metal:
Uses of silver
Give the general characteristics of:
Alkaline earth metals with reference to
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
Write scientific reason.
Pine oil is used in froth flotation.
The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. Which of the two metals is more reactive? Write their reaction with dilute hydrochloric acid.
Name the following:
A metal used in packaging.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
An amorphous substance which turns from pale green to black on strong heating evolving a colourless, acidic gas as the only gaseous product.
Complete the following flow chart.
Generally, metals are solid in nature. Which one of the following metals is found in a liquid state at room temperature?
The electronic configurations of three elements X, Y and Z are X – 2, 8; Y – 2, 8, 7 and Z – 2, 8, 2. Which of the following is correct?
Metals are usually solids or gases at room temperature.
Which metals are liquid at room temperature?
