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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

True Or False New Substances Are Formed in a Chemical Change.

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प्रश्न

True or false 

New substances are formed in a chemical change.

विकल्प

  • True

  • False

MCQ
सत्य या असत्य
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उत्तर

True

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अध्याय 2: Physical and Chemical Changes - Additional questions 1

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 2 Physical and Chemical Changes
Additional questions 1 | Q 4

संबंधित प्रश्न

Write the missing reactants and products and balance the equations.

\[\ce{KClO3 ->[heat]}\] ___________+ ____________


FILL IN THE BLANK

On reaction with sulphuric acid solution, barium chloride forms a white precipitate of ........ sulphate.


TRUE \ FALSE

Evaporation of water is a physical change. True or false ?


TRUE \ FALSE

Temperature at which a liquid starts boiling is known as the boiling point of that liquid. True or false ?


What are chemical reactions?


Fill in the blank:

The basic conditions necessary for a chemical reaction is _______


State what you would observe when the following substance is heated in a glass test tube red lead.


Show with the help of diagram of electronic configuration how the following compound is formed from the constituent atoms.

Hydrogen chloride


Give one example electrochemical reaction.


State the original colour of the following substance and colour of residue obtained after heating.

Ammonium dichromate


Give a chemical test to distinguish between the following gases. 

H2 and CO2


Distinguish by dilute sulphuric acid.

Sodium Sulphite and sodium carbonate?


Select the correct answer for the following options:

The gas which reacts with oxygen to give a neutral liquid.


Discuss how acid rain occurs due to emission of smoke from vehicles and industries?


Classify the following as physical or chemical properties

Zinc dissolves in hydrochloric acid with the evolution of hydrogen gas.


A chemical change may involve –


The chemical formula of rust is ______.


How can we prevent rusting?


Write a note on the catalyst.


Write a note on the following:

Fermentation


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