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What do the following symbol stand for? 2H2 - Chemistry

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प्रश्न

What do the following symbol stand for?

2H2 

एक पंक्ति में उत्तर

उत्तर

2H2 stands for Two molecules of hydrogen.

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अध्याय 1: The Language of Chemistry - Exercise 1 (A) [पृष्ठ ९]

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सेलिना Concise Chemistry [English] Class 9 ICSE
अध्याय 1 The Language of Chemistry
Exercise 1 (A) | Q 5.4 | पृष्ठ ९

संबंधित प्रश्न

The chemical reaction between two substances is characterised by a change in colour from orange to green. These two substances are most likely to be:
(a) potassium dichromate solution and sulphur dioxide
(b) potassium permanganate solution and sulphur dioxide
(c) potassium permanganate solution  and lemon juice
(d) potassium dichromate solution and carbon dioxide.


A white precipitate can be obtained by adding dilute sulphuric acid to:
(a) CuSO4 solution
(b) Nacl solution
(c) BaCl2 solution
(d) Na2SO4 solution


Dry raisins were soaked in water for 2 hours, to determine the percentage of water absorbed by raisins. Before final weighing of swollen raisins, the extra water left on the surface of soaked raisins was removed by:


Write the answer to the following.

Explain the similarity and difference in two events, namely adding NaOH to water and adding CaO to water.


Write the chemical equation for the following word equation and balance them.

Calcium oxide + Carbon dioxide → Calcium carbonate


\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]

0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate the mass of acid required.


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 – mercury [II] oxide.


Balance the following simple equation:

CO2   +   C  →  CO 


Balance the following simple equation:

Fe2O3  +  H2  → Fe  +  H2O


Write three steps of writing chemical equations with example?


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