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Q:

Which of the following group is NOT Dobereiner Triads?

 

A) Li, Na, K B) N, P Au
C) Cl, Br, I D) Ca, Sr, Ba

Answer:   B) N, P Au



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Subject: Chemistry
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Which of the following inert gases is placed in period 4 of the periodic table?

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Answer & Explanation Answer: A) Kr

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....... is the property of attracting electrons by the halogen atoms in a molecule

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............. elements have the largest atoms

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Answer & Explanation Answer: D) Li

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Soft drinks contain:

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Answer & Explanation Answer: C) Carbonic acid

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........... as is used as an illuminating gas.

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Answer & Explanation Answer: B) Propane

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What is the percentage of oxygen in Al2(SO4)3?

A) 57.7% B) 56.1%
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Answer & Explanation Answer: B) 56.1%

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Metals reacts with acids to give:

A) a salt and chlorine B) a salt and hydrogen
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Answer & Explanation Answer: B) a salt and hydrogen

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Elements A, B and C occur as Dobereiners triads. If the atomic mass of A is 7 and that of C is 39, what will be the atomic mass of B?

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Answer & Explanation Answer: A) 20

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