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What do you understand by a lone pair of...

What do you understand by a lone pair of electrons ?

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A lone pair is an electron pair in the outermost shell of an atom that is not shared or bonded to another atom. Below is the example of lone pair on nitrogen atom of ammonia molecule `(NH_3)`.
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ICSE-SAMPLE PAPER 2018-SECTION-II
  1. What do you understand by a lone pair of electrons ?

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  2. Draw the electron dot diagram of Hydronium ion. (H = 1, O = 8)

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  3. In Period 3 of the Periodic Table, element B is placed to the left of...

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  4. In Period 3 of the Periodic Table, element B is placed to the left of ...

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  5. In Period 3 of the Periodic Table, element B is placed to the left of...

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  6. Complete the following table which refers to the conversion of ions to...

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  7. Write the balanced chemical equation to prepare ammonia gas in the lab...

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  8. State why concentrated sulphuric acid is not used for drying ammonia g...

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  9. Why is ammonia gas not collected over water?

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  10. Name the acid used for the preparation of hydrogen chloride gas in the...

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  11. Write the balanced chemical equation for the laboratory preparation of...

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  12. For the preparation of hydrochloric acid in the laboratory : Why is...

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  13. For the preparation of hydrochloric acid in the laboratory : What a...

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  14. For the electro-refining of copper What is the cathode made-up of ?

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  15. For the electro-refining of copper Write the reaction that takes pl...

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  16. The percentage composition of a gas is : Nitrogen 82.35%, Hydrogen 17....

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  17. Aluminium carbide reacts with water according to the following equatio...

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  18. Aluminium carbide reacts with water according to the following equatio...

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  19. If 150 cc of gas A contains X molecules, how many molecules of gas B w...

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  20. If 150 cc of gas A contains X molecules, how many molecules of gas B w...

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