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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Give a Word Equation for the Following Reaction. Two Solids Which Combine on Heating, to Give a Liquid.

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प्रश्न

Give a word equation for the following reaction.

Two solids which combine on heating, to give a liquid.

एका वाक्यात उत्तर
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उत्तर

Carbon + Sulphur → Carbon disulphide

C + S → CS(l)

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पाठ 5: Language of Chemistry - Objective Type Questions

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विराफ जे. दलाल New Simplified Middle School Chemistry [English] Class 7
पाठ 5 Language of Chemistry
Objective Type Questions | Q 2.1

संबंधित प्रश्‍न

How do the following help in bringing about a chemical change?

pressure.


Complete and balance the following chemical equations:

`"H"_2"S"` + `"CI"_2`  `→`  


Write a short note on the information derived from a balanced chemical equation.


Fill in the blank

A new substance is always formed in a _______ change.


Explain the following reaction with one suitable example of Double decomposition reaction.


Complete the statement by filling the gap using an  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)

An ______ is drawn in between the reactants and products while writing the equation for a chemical reaction.


Explain by writing a word equation.

Limestone powder disappears on adding to dilute hydrochloric acids.


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

Water


Give reason for the following:

Blue solution of copper sulphate changes to green when a piece of iron is added to this solution.


Give reason for the following:

Colourless concentrated sulphuric acid in a test tube changes to blue on adding a small piece of copper to it.


Multiple choice:

Thermal decomposition of sodium carbonate will produce


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 – Addition of dilute hydrochloric acid to silver nitrate.


State the following reaction represent oxidation or reduction.

\[\ce{Cu++->Cu}\]


State the following reaction represent oxidation or reduction.

\[\ce{Ag->Ag+}\]


State the following reaction represent oxidation or reduction.

\[\ce{Al->Al+++}\]


Give two examples where a chemical reaction is accompanied by a change in colour of the reactants and products on completion of the reaction.


A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.

Write a word equation for the chemical change, if any.


When magnesium is burnt in the air, a new substance is formed which is ______.


______ are substances that speed up the process of a chemical change and it will not undergo any change during the course of the reaction.


Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.


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