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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Explain the Following Reaction with One Suitable Example Of Combination Reactions . - Chemistry

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प्रश्न

Explain the following reaction with one suitable example of Combination reactions .

एका वाक्यात उत्तर

उत्तर

Combination reactions : In this reaction two or more substances combine to form a new substance, e.g. Burning of hydrogen in air.

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पाठ 5: Language of Chemistry - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 5 Language of Chemistry
Additional questions | Q 7.1

संबंधित प्रश्‍न

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

Iron pipes coated with zinc do not get rusted easily.


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

Iron and rust are the same substances. 


Changes in which new substances are formed are called ______ changes.


Complete and balance the following chemical equations:

Zn + `"H"_2"SO"_4`  `→`

           (dil)


Fill in the blank

 A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.


Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.

\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]


TRUE \ FALSE

Ammonia is a good oxidizing agent.


Fill in the blank:
The substances which undergo chemical change are called _______


Write true or false.

A chemical equation gives only qualitative information of a chemical reaction.


A chemical equation is a statement that describes a chemical change in terms of


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)

Oxygen is a ______ in respiration.


Explain the term reactant and product giving examples. 


What is a chemical reaction?


Give an example of a reaction where the following are involved:

Close contact


Give reason for the following:

Molybdenum is used in the manufacture of ammonia.


What do you understand by precipitation reaction? Explain with examples.


State the type of reactions for the following represent and balance the ones that are not balanced.

NaOH + HCl → NaCl + H2O


Multiple choice:

A reaction of a type: AB + CD → AD + CD, involves


Name: Gas with rotten egg smell. 


Write your observation and a balanced equation in the case of the following substances being heated.

Zinc carbonate.


Distinguish by dilute sulphuric acid.

Sodium Sulphite and sodium carbonate?


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

Hydrated copper sulphate to sulphur dioxide


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

Zinc nitrate to nitrogen dioxide


Limestone contains ______ mainly.


Classify the following as physical or chemical properties

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


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


Write a note on the catalyst.


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