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What is Meant by Saying that Metals Are Sonorous ?

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प्रश्न

What is meant by saying that metals are sonorous ?

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उत्तर

Metals are sonorous because they generate sound when hit.

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पाठ 2: Is Matter Around Us Pure - Very Short Answers [पृष्ठ ५६]

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लखमीर सिंह Chemistry Part 2 [English] Class 9
पाठ 2 Is Matter Around Us Pure
Very Short Answers | Q 13 | पृष्ठ ५६

व्हिडिओ ट्यूटोरियलVIEW ALL [3]

संबंधित प्रश्‍न

Intermolecular force of attraction is maximum in ............ less in .......... and the least in .............


Liquids have definite shape and definite volume.


An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.


When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.

  1. What could particles X be ?
  2. What do you think liquid Y is ?
  3. What is the zig-zag movement of X known as ?
  4. What is causing the zig-zag movement of particles X ?
  5. Name the scientist who discovered this phenomenon.
  6. What does this experiment tell us about the nature of liquid Y?

Which of the following is a mixture ?

Salt, Air, Water, Alum, Sugar


What is the general name of the materials which contain at least two pure substances and show the properties
of their constituents ?


What is the other name for impure substances ? Give two examples of impure substances.


One of the following substances is neither a good conductor of electricity nor an insulator. This substance is :


Which of the following does not have a fixed melting point/boiling point ?


Differentiate between a saturated and an unsaturated solution. How will you test whether a given solution is saturated or not ?


One of the following does not show Tyndall effect. This one is :


Which one of the following is not a chemical change ?


One of the following liquids will leave behind a residue on heating. This one is :


Name the property of one of the constituents which can be used to separate a mixture of salt and iodine


The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :

(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?

(b) Which component will be collected from the top part of the fractional distillation column ? Why ?

(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?

(d) What could the component X, Y and Z be ?


Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.

  1. What could X be ?
  2. What could Y be ?
  3. Name the process Z.
  4. Which process would you use to recover both the components X and Y from tincture of iodine ?
  5. Which process can be used to recover only component Y from tincture of iodine ?

Match the physical quantities given in column A to their S I units given in column B:

(A) (B)
(a) Pressure (i) cubic metre
(b) Temperature (ii) kilogram
(c) Density (iii) pascal
(d) Mass (iv) kelvin
(e) Volume (v) kilogram per cubic metre

Rusting of an article made up of iron is called


The fluidity of solids: ______.


Examples of foam are ______.


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