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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

Statements Given Below Are Incorrect. Write the Correct Statements : Bronze is a Mixture of 10% Copper, 80% Zinc and 10% Tin.

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प्रश्न

Statements given below are incorrect. Write the correct statements : 

Bronze is a mixture of 10% copper, 80% zinc and 10% tin.  

एक पंक्ति में उत्तर
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उत्तर

Bronze is a mixture of 80% copper, 10% zinc and 10% tin.

 
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अध्याय 6: Metals and Non-metals - Additional questions 1

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एस पी सिंग Concise Chemistry [English] Class 7 ICSE
अध्याय 6 Metals and Non-metals
Additional questions 1 | Q 2.2

संबंधित प्रश्न

Mark ‘T’ if the statement is true and ‘F’ if it is false.

Sodium is a very reactive metal. ( )


The electrical conductivity and melting point of an alloy is ______ than that of pure metals.


Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula.


Write ‘true’ or ‘false’ for the following statement : 

Silver is used to make electric cables.


Aluminium is not used to make : 


Statements given below are incorrect. Write the correct statements : 

Zinc is used for making power transmission wires.  


Why are alkali metals kept in kerosene oil?


Write name.
 Alloy of sodium with mercury.


Write name.

Molecular formula of the common ore of aluminium.


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.


Give a reason why iron objects rust easily but the iron pillar at Qutab Minar has not rusted over the years.


Name the following:

The most reactive halogen.


Complete the following flow chart.


Assertion: Mercury is solid in room temperature.

Reason: Mercury is a non-metal.


Give reasons for the following.

  1. Aluminum foils are used to wrap food items.
  2. Immersion rods for heating liquids are made up of metallic substances.
  3. Sodium and potassium are stored in kerosene.
  4. Mercury is used in thermometers.

Give an example of a metal which

  1. is liquid at room temperature.
  2. is the best conductor of heat.

Name two soft metals which can be cut with a knife.


Name two major non-metals which are present in fertilisers and enhance the growth of plants.


Metals are ______ conductors of heat and electricity.


Which metals are not solid at room temperature?


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