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सी.आई.एस.सी.ई.आईसीएसई ICSE Class 7

What Information Do You Get from the Equation H2+ Cl2 → 2hcl ? - Chemistry

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प्रश्न

What information do you get from the equation H2+ Cl2  →  2HCl ?

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उत्तर

(a)Hydrogen and chlorine molecules are the reactants.
(b)They are in gaseous form.
(c)The product is hydrogen chloride gas.
(d)Two molecules of hydrogen chloride are formed.

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अध्याय 5: Language of Chemistry - Exercise

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सेलिना Concise Chemistry [English] Class 7 ICSE
अध्याय 5 Language of Chemistry
Exercise | Q 6

संबंधित प्रश्न

What is a chemical equation? Explain with the help of an example.


Which of the following does not involve a chemical reaction?


When water is added gradually to a white solid X, a hissing sound is heard and a lot of heat is produced forming a product Y. A suspension of Y in water is applied to the walls of a house during white washing. A clear solution of Y is also used for testing carbon dioxide gas in the laboratory.
(a) What could be solid X? Write its chemical formula.
(b) What could be product Y? Write its chemical formula.
(c) What is the common name of the solution of Y which is used for testing carbon dioxide gas?
(d) Write chemical equation of the reaction which takes place on adding water to slid X.
(e) Which characteristic of chemical reactions is illustrated by this example?


Balance the following equation. Also name the product formed. 

`"Na"+ "H"_2 "O" → "NaOH"+ "H"_2`


Balance the following equation:

Fe2O3 + CO → Fe + CO2


How is a flame test performed?


Match column A with column B. 

Column A Column B
(a) Blue salt changes to white and then black (i) Ammonium dichromate
(b) Orange coloured compound changes to green. (ii) Iodine
(c) Red compound changes to brown and then yellow. (iii) Zinc Nitrate
(d) White to yellow when hot and white when cold. (iv) Copper sulphate
(e) Violet solid changes to violet vapours. (v) Red Lead

Considering the relationship in the first pair, complete the second paie :

AgCI : White :: CuI2 : ___________


A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated –  lead [IV] oxide.


Balance the following simple equation:

Al  +   H2O   →   Al2O3   +   H2 


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