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Atomicity

2g of oxygen ...

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2g of oxygen contains number of atoms equal to that in (a) 0.5 g of hydrogen (b)4 g of sulphur (c)7 g of nitrogen (d) 2.3 g of sodium

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Q. In which group do all the elements have a valency of one?
(a) hydrogen, oxygen, chlorine
(b) potassium, hydrogen, sulphur
(c) sodium, chlorine, hydrogen
(d) sodium, hydrogen, sulphur

Q. In a lab situation, a student is asked to identify which macromolecule is found in 3 different solutions.
Solution 1 contains a macromolecule that is composed of atoms of carbon, hydrogen, oxygen and nitrogen. It tests positive with Biuret solution.
Solution 2 contains a macromolecule composed of carbon, hydrogen and oxygen in a 1:2:1 ratio. It tests positive with iodine-potassium iodide solution.
Solution 3 contains a macromolecule that is composed of atoms of carbon, hydrogen, oxygen, and phosphorus.
Which of these best identifies the macromolecule found in each solution?

Q. 2 gm of oxygen contains number of atoms equal to that in:

Q. 2 g of oxygen contains number of atoms equal to that in:

Sugar is a compound which contains carbon, hydrogen, nitrogen and oxygen atoms.

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