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Which one of the following best explains...

Which one of the following best explains the law of conservation of mass ?

A

No change in mass is observed when 2.0 g of Mg is heated in vacuum

B

1.2 g of carbon when burnt in excess of oxygen consumes only 3.2 g of it to form 4.4 g of carbon dioxide

C

12.g of carbon when heated in air produces only 20 g of carbon monoxide

D

A sample of `Ca CO_(3)` on heating does not show any change in mass of `C_(a) CO_(3)` but volume increases

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The correct Answer is:
B
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AAKASH INSTITUTE-SOME BASIC CONCEPTS OF CHEMISTRY -ASSIGNMENT SECTION A (Objective Type Questions (One option is correct))
  1. A balanced chemical equation is in accordance with

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  2. When pentane , C(5) H(12) is burned in excess oxygen , the products of...

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  3. Which one of the following best explains the law of conservation of ma...

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  4. The percentage of hydrogen in water and hydrogen peroxide is 11 .1 and...

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  5. Element X forms five stable oxides with oxygen of formula X(2) O, XO ,...

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  6. Which of the following represents Avogadro's hypothesis ?

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  7. Two oxides of a metal contain 27.6% and 30.0% of Oxygen, respecttively...

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  8. Which of the following is not a physical quantity of measurement ?

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  9. Physical properties can be measured

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  10. When 200 g of lime strongly heated , it undergoes thermal decompositio...

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  11. Carbon and oxygen react in ratio 3 : 8 by mass to form CO(2) . What we...

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  12. Molecular mass of C(3) H(7) OH is

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  13. If an atom of an element has twice the mass of C-12 , then its atomic ...

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  14. Formula unit mass of K(2) CO(3) is (Atomic mass of K = 39 u , C = 1...

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  15. The number of moles of nitrogen atom in 56 g nitrogen is

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  16. The number of mole of N - atom in 18.066 x 10 ^(23) nitrogen atoms is

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  17. The number of particles presents in 1 mol of nitrogen atom are

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  18. Molality is expressed in units of

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  19. Which of the following is correct ?

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  20. What weight in grams is represented by 1.5 moles of sulphur dioxide ?

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