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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

What Do You Observe When : Ime is Dissolved in Water. - Chemistry

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प्रश्न

What do you observe when :

ime is dissolved in water.

एका वाक्यात उत्तर

उत्तर

The following two observations will be observed
(i) A hissing sound is observed.
(ii) The mixture starts boiling and lime water is obtained.

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पाठ 2: Physical and Chemical Changes - Exercise

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 2 Physical and Chemical Changes
Exercise | Q 8.8

संबंधित प्रश्‍न

Convert the following temperature to the Kelvin scale.

373°C


What is the physical state of water at 0°C.


Explain why, a small volume of water in a kettle can fill a kitchen with steam.


Name the temperature at which :

  1. a liquid changes into a gas. 
  2. a solid changes into a liquid.

What is the chemical name of dry ice ?


What do you understand by the term 'latent heat' ? What are the two types of latent heat ?


Which contains more heat, 1 kg of ice of 0° C or 1 kg of water at 0° C ? Give reason for your answer.


Which contains more heat, 1 kg of water at 100° C or 1 kg of steam at 100° C ? Give reason for your answer.


On converting 25°C, 38°C and 66°C to Kelvin scale, the correct sequence of temperatures will be :


Define Intermodular force of attraction


Give reasons:

Why a solid does not flow, but a liquid flows?


Give two examples of the following:

Substances which do not change their states.


The process by which a solid changes into a liquid is called


State if the following is a physical property of a substance.

Water acidified with dilute sulphuric acid is a good conductor of electricity.


Write the properties of this substance.

Water


Fill in the blank with the correct word of the statement given below:

Sublimation is _______ a change of state of matter.


Fill in the blanks with the correct words of the statement given below:

During sublimation, a solid on heating turns directly into _________ and on cooling back to __________.


What is inter-conversion of matter. Give the meaning of the terms involved in inter-conversion of matter

(a) Melting
(b) Vaporisation
(c) Liquefaction or condensation,
(d) Solidification or freezing
(e) Sublimation.


Select the correct answer from A, B, C, D & E for the statement given below:

The state of matter which has ___________ least density & no free surfaces.


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