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Q 1.
How relative mass of all atoms are obtained by comparison with the mass of ___atom?
Ans.
Carbon-12
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Q 2.
Names the elements present in compound baking powder?
Ans.
Sodium, hydrogen, carbon and oxygen.
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Q 3.
Chemical name of mercury?
Ans.
Hg
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Q 4.
Chemical name of iron?
Ans.
Fe.
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Q 5.
Mass of 1 mole of a substance is called?
Ans.
Molar mass.
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Q 6.
Chemical formulae of calcium oxide?
Ans.
Cao
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Q 7.
What is the mass of 0.2 mole of oxygen atoms?
Ans.
3.2g
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Q 8.
What is the mass of 1 mole of nitrogen atoms?
Ans.
14g
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Q 9.
Convert into mole?
12 g of oxygen gas
Ans.
0.375 mole.
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Q 10.
During a chemical reaction, the sum of masses of the reaction and product remains unchanged. This is known as?
Ans.
Law of conservation of mass.
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Q 11.
Chemical name of common salt?
Ans.
NaCl.
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Q 12.
Full form of IUPAC?
Ans.
International Union of Purified and Applied Chemistry.
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Q 13.
Atomic radius is measured by?
Ans.
Nanometer.
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Q 14.
What is the ratio of carbon and oxygen in a compound of carbon dioxide?
Ans.
3:8
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Q 15.
Name the symbol for unified Mass?
Ans.
u
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Q 16.
A negatively charged ion is called?
Ans.
Anion.
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Q 17.
Chemical formulae of Sodium, Potassium, Tin and Lead?
Ans.
Na, K, Sn, Pb.
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Q 18.
What is the ratio of mass of hydrogen to the mass of oxygen in water?
Ans.
1:8.
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Q 19.
Which scientists presented Atomic theory in 1808 or the name " Atom" was given by which scientists?
Ans.
John Dalton.
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Q 20.
Name the person who gave Law of conservation of mass and Law of constant proportion?
Ans.
AntoineLavoisier and JosephProust.
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