The observation that water is always composed of 8.0 g of oxygen for 1.0 g of hy
ID: 527189 • Letter: T
Question
The observation that water is always composed of 8.0 g of oxygen for 1.0 g of hydrogen is a demonstration of law of definite proportions. law of multiple proportions. conservation of mass. Avogadro's hypothesis. Which of the following is NOT true about sulfuric acid? Sulfur is converted first to SO_2 then to SO_3, and, finally, water is added to give sulfuric acid. Sulfuric acid is the top chemical produced in the United States by mass. Sulfuric acid is used directly on crops as a fertilizer. Most of the sulfuric acid is used to make fertilizer. A thin coating of zinc can be used to provide iron nails from rusting in a process called galvanization. The Zinc con protect the iron because the zinc is more difficult to oxidize than iron and acts as a barrier. The zinc is easier to oxidize than iron, so it oxidizes instead of the iron. zinc is easier to reduce than iron, so it is reduced instead of the iron. The zinc prevents the oxygen from the oxygen from reaching the iron so it cannot react. Arrange the following atoms or ions in order of increasing size: Ar, K^+, Cl^-, Ca^2+, S^2- Ca^2+Explanation / Answer
12. The observation that water is always composed of 8 grams of oxygen and 1 gram of hydrogen is a demonstration of
A) law of definite proportion
The ratio of oxygen and hydrogen in water by mass is 8:1. And the ratio is fixed always, it does not vary with the source of water. It is called law of definite proportion.
13. Which of the following is not true about sulphuric acid?
C) Sulfuric acid is used directly as fertiliser on crop.
It is a strong acid and can not be used as fertiliser.
14.The zinc can protect iron because
B) zinc is easier to oxidised than iron, so it oxidises instead of iron
Rusting of iron is the oxidation of iron metal by aerial oxygen. Zn is easier to be oxidised than iron, so it is oxidised by oxygen faster than iron.
15. Ar has 18 electrons and 18 protons
K+ has 18 electrons and 19 protons
Cl- has 18 electrons and 17 protons
Ca+2 has 18 electrons and 20 protons
S-2 has 18 electrons and 16 protons
All the species have same no of electrons but varying no of protons. More protons in nucleus attract the electrons much more and hence size decreases. So the increasing order of size is
A) Ca+2 < K+ < Ar< Cl- < S-2
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