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Atoms and Molec...

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  • Question 1
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    Calculate the formula unit mass (u) of $$\displaystyle { Na }_{ 2 }O$$ .

    $$Atomic \ mass \ of \ Na = 23 \ u, O=16 \ u$$

  • Question 2
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    Calculate the formula unit mass (u) of $$\displaystyle NaCl$$:

    $$ [Na=23u, Cl=35.5u]$$

  • Question 3
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    Who stated the law of constant proportion?

  • Question 4
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    When $$3\ g$$ of carbon is burnt in $$8\ g$$ of oxygen, $$11 g$$ of carbon dioxide is produced. What mass of carbon dioxide will be formed when $$3\ g$$ of carbon is burnt in $$50\ g$$ oxygen?

  • Question 5
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    Which of the following symbol of elements is not taken from Latin names?

  • Question 6
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    In ammonia, nitrogen and hydrogen always combine in $$14:3$$ ratio by mass. This is in agreement with :

  • Question 7
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    Which is not the method used for creating the symbols of elements?

  • Question 8
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    The cation and anion present in $$HNO_3$$ are :

  • Question 9
    1 / -0

    Which of the following statement is true about mole?

  • Question 10
    1 / -0

    Which Indian philosopher was the first one to postulate the idea of matter divisibility around 500 B.C?

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