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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 

एका वाक्यात उत्तर

उत्तर

2H2 stands for Two molecules of hydrogen.

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

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

संबंधित प्रश्‍न

Balance the following chemical equation.

\[\ce{NaCl + AgNO3 -> AgCl + NaNO3}\]


Write complete balanced equation for the following reaction:

Calcium (solid) + water (liquid)  Calcium Hydroxide (solution) + Hydrogen (gas)


When a mixture of gases X and Y is compressed to 300 atm pressure and then passed over a catalyst consisting of a mixture of zinc oxide and chromium oxide (heated to a temperature of 300°C), then an organic compounds Z having the molecular formula CH4O is formed. X is a highly poisonous gas which is formed in appreciable amounts when a fuel burns in a limited supply of air; Y is a gas which can be made by the action of a dilute acid on an active metal; and Z is a liquid organic compound which can react with sodium metal to produce hydrogen gas.
(a) What are X, Y and Z?
(b) Write a balanced chemical equation of the reaction which takes place when X and Y combine to form Z. Indicate the conditions under which the reaction occurs.


Write word equation for the following skeletal equation:

\[\ce{Ca + O2 → CaO}\]


Name the fundamental law that is involved in every equation.


Write the balanced chemical equation of the following reaction.
potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water


Balance the following simple equation:

NO   +   O2  →  NO2 


CaCO3 + 2HCl[dil.] → CaCl2 + H2O + CO2 [g]

State the information provided by the above chemical equation.


Underline the compound in the equation given below, it is incorrectly balanced and write the correct balancing for the same.

6NaOH + 3Cl2 → 6NaCl + NaClO3 + 3H2O


Which among the following is(are) double displacement reaction(s)?

  1. `"Pb" + "CuCl"_2 -> "PbCl"_2 + "Cu"`
  2. `"Na"_2"SO"_4 + "BaCl"_2 -> "BaSO"_4 + 2"NaCl"`
  3. `"C" + "O"_2 -> "CO"_2`
  4. `"CH"_4 + 2"O"_2 -> "CO"_2 + 2"H"_2"O"`

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