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8g of oxygen combine with 1g of hydrogen and 20g of calcium therefore, when calcium combines with hydrogen it must combine in the ratio of 20:1. This statement confirms to the law of

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Important Questions on Atoms and Molecules

EASY
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IMPORTANT
Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 33
Which of the following reactions is not correct according to the law of conservation of mass?
EASY
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IMPORTANT
Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 34

Consider the following laws:

  1. Law of conservation of mass
  2. Law of definite proportions
  3. Law of multiple proportions

Which of these govern(s) the quantitative aspects of chemical changes?

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Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 36

Ammonia NH3 obtained from different sources always has same proportion by mass of nitrogen and hydrogen. It proves the validity the law of:

MEDIUM
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IMPORTANT
Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 37
The law of conservation of mass is not correct for:
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Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 38
Chemical equation is balanced, according to the law of:
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Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 39
Hydrogen, sulphur and oxygen gives H2S, SO2 and H2O. This is according to the law of
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Chemistry Crash Course NDA & NA EE>Chapter 3 - Atoms and Molecules>Exercise 1>Q 40
The reaction between iron and copper sulphate solution represents which type of reaction?