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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Write ‘True’ Or ‘False’ for the Following Statement : Silver is Used to Make Electric Cables .

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प्रश्न

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

Silver is used to make electric cables.

पर्याय

  • True

  • False

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चूक किंवा बरोबर
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उत्तर

False

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पाठ 6: Metals and Non-metals - Objective type questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 6 Metals and Non-metals
Objective type questions | Q 3.1

संबंधित प्रश्‍न

Fill in the following blanks with suitable words:

A metal having low melting point is ..................... but a non-metal having very high melting point is ..............


State one use of Copper.


Name two alloys of iron. What elements are present in these alloys?


Which property of 'solder' alloy makes it suitable for welding electrical wires?


Give two uses of Germanium  


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 scientific reason.

Pine oil is used in froth flotation.


State why telegraph poles are painted with aluminium paint.


Name the following:

The most reactive halogen.


Name the following:

A metal used in flexible pipes.


Match the columns.

Group A Group B
1) Copper and Zinc a) Brass
2) Copper and Tin b) Bronze
  c) Stainless steel

Halogen reacts with acid.


When a copper coin is dipped in the solution of silver nitrate, it shows a lustre on its surface. Explain this process with the help of a chemical equation.


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.

  1. Formulate a hypothesis based on the information provided.
  2. Briefly state how you would test the hypothesis.

A is a reddish-brown metal, which combines with O2 at < 1370 K gives B, a black coloured compound. At a temperature > 1370 K, A gives C which is red in colour. Find A, B, and C with reaction.


In the following figure, you find that the bulb glows when an iron nail is placed between two ends of wire. Complete the following sentences on the basis of this fact.

  1. ______  is a metal.
  2. Metals are good ______ of electricity. 

The typical shine of metals is called ______.


Why do metals appear shiny?


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