मराठी
सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Select the Correct Answer for the Following Options: the Gas Obtained When Potassium Chlorate is Heated in the Presence of a Catalyst.

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प्रश्न

Select the correct answer for the following options:

The gas obtained when potassium chlorate is heated in the presence of a catalyst.

पर्याय

  • Hydrogen 

  • Copper [II] oxide 

  • Oxygen 

  • Copper [II] hydroxide 

  • Ammonia

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उत्तर

Oxygen

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पाठ 5: Language of Chemistry - Objective Type Questions

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विराफ जे. दलाल Simplified Middle School Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Objective Type Questions | Q 1.3

संबंधित प्रश्‍न

State whether the following statement is true or false. In case a statement is false, write the corrected statement.

Formation of manure from leaves is a physical change.


FILL IN THE BLANK

A .............. change is a temporary change.


FILL IN THE BLANK

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


Name the type of chemical reaction shown by the following equation:

2Mg + O2 → 2MgO


A solution of a substance ‘X’ is used for white washing write the reaction of the substance ‘X’ named in (a) above with water.


Complete the statement by filling the gaps using appropriate term from the terms given in the bracket.

(slow, coloured, arrow, fast, smell, milky, physical, product, chemical, reactant, covalent, ionic, octet, duplet, exchange, sharing, equality sign)

The white particles of baking soda disappear when put in lemon juice. This means that it is a ______ change.


Explain by writing a word equation.

Hard water gets softened on mixing with a solution of washing soda.


When electric current is passed through acidulated water ______ of water takes place.


Give an example of the following chemical change.

Two gases combine to form white solid


Distinguish by heating the following in dry test tubs.

Copper Sulphate and copper carbonate


A chemical reaction is often accompanied by external indications or characteristics which include – 

  1. Colour change
  2. Effervescence or gas evolved
  3. Evolution or absorption of heat
  4. Formation of a precipitate.

With reference to each of the above indications, state the external indication seen during – Thermal decomposition of mercury [II] oxide.


Give balanced equation for the following conversion affected by heat alone on the substance:

Copper carbonate to copper oxide


Select the correct answer from the options given below:

State the gaseous product formed, when

An active metal reacts with dilute sulphuric acid.


Name the solid residual product formed reaction and state its colour during – thermal decomposition of the following substance.

Lead nitrate.


Rusting of Iron: undesirable change:: Dead plants turn into manure: ______.


On heating calcium carbonate gets converted into calcium oxide and carbon dioxide.

(a) Is this a physical or a chemical change?

(b) Can you prepare one acidic and one basic solution by using the products formed in the above process? If so, write the chemical equation involved.


Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings


When carbon dioxide is passed through lime water ______.


Write the effects of chemical reactions.


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