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What Do the Following Symbols Represent : 2h and H2. - Chemistry

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प्रश्न

What do the following symbols represent : 2H and H2.

एका वाक्यात उत्तर
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उत्तर

2H → represents → 2 atoms of hydrogen
H2 → represents → 1 molecule of hydrogen

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पाठ 6: Study Of The First Element — Hydrogen - Exercise

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विराफ जे. दलाल Simplified ICSE Chemistry [English] Class 9
पाठ 6 Study Of The First Element — Hydrogen
Exercise | Q 9.2

संबंधित प्रश्‍न

 Give reason for the following:

Helium replaced hydrogen in weather observation balloons?


Multiple Choice Question

Hydrogen is responsible for producing


MULTIPLE CHOICE QUESTIONS

The name hydrogen was given by

  1. Cavendish
  2. Lavoisier
  3. Haber
  4. none of these

MULTIPLE CHOICE QUESTIONS

Which is the lightest of all elements?

  1. hydrogen
  2. helium
  3. lithium
  4. none of these

FILL IN THE BLANK

In nature, hydrogen occurs as a .................. molecule represented as H2


Why is hydrogen called a reducing agent? Give chemical equation to support your answer ?


Give the balanced equation of the reaction.


With reference to the equation : Cl2 + H2S → 2HCl + S pertaining to a redox reaction – select the correct answer.

Chlorine acts as an ______ agent.


Give balanced equation for the following conversion:

Iron [III] oxide to iron – using hydrogen.


Give reason for the following:

The reaction of chlorine with hydrogen sulphide is deemed a redox reaction.


Select the correct options for the following statement:

The gas which has now replaced hydrogen in air balloons is ___.


Match the statements in List I with the appropriate answer in List II.

List I List II
1. An atom of hydrogen A: Chromic oxide
2. A strong oxidising agent B: Ammonia
3. A promoter used in Bosch process C: Iron
4. A chemical used in the manufavture of fertilizers D: One electron
5. The catalyst used in production of a basic gas from nitrogen. E: Dilute nitric acid

Name a gas which burns in air or oxygen forming water.


Write a correctly balanced equation for the following:

When steam is passed over red hot iron.


Explain the following:

Two jars of H2 are collected – “one burns quietly and the other does not”.


Write correctly the balanced equation for the following:

‘When zinc filings are added to a concentrated solution of sodium hydroxide’.


Write down the “word equation” for the following reaction:

sodium hydroxide solution + zinc → ?


Complete and balance the following equations:

Al + NaOH + ____ → ____ + ____


Write balanced equation of the reaction in the preparation of : hydrogen from a solution of potassium hydroxide [other than by electrolysis].


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