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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



Explanation:
Subject: Chemistry
Exam Prep: Bank Exams
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Formation of anions occurs by

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Answer & Explanation Answer: C) gain of electrons

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Formation of cation occurs by

A) gain of electron B) loss of electron
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Answer & Explanation Answer: B) loss of electron

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A particle which is four times in mass and two times in charge that of proton is

A) helium atom B) an alpha particle
C) deuteron D) tritium
 
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Q:

A Radioactive subatance emits

A) alpha particles B) beta particle
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Answer & Explanation Answer: D) all of the three

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The alpha-particles are

A) high energy electrons B) positively charged hydrogen irons
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Answer & Explanation Answer: D) double positively charged helium nuclei

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6 5345
Q:

The activity of rradioisotope change with

A) temperature B) pressure
C) chemical environment D) None of these
 
Answer & Explanation Answer: D) None of these

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6 5151
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Natural radioactivity was discovered by

A) Rutherford B) Becquerel
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Answer & Explanation Answer: B) Becquerel

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