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Q:

The pH value increase from 7 to 14 represents a

A) decrease in H+ ion concentration B) decrease in OH- ion concentration
C) increase in OH- ion concentration D) increase in H+ ion concentration
 
Answer & Explanation Answer: C) increase in OH- ion concentration

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Q:

If Metal A displaces Metal B from its solution, then Metal A ____.

A) is more reactive than B B) is less reactive than B
C) is heavier than B D) has the same reactivity as B
 
Answer & Explanation Answer: A) is more reactive than B

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Q:

Which of the following is NOT a noble gas?

A) Radon B) Krypton
C) Xenon D) Hydrogen
 
Answer & Explanation Answer: D) Hydrogen

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Q:

Which of the following causes damage to bridges, iron railings and all objects made of metals?

A) Reduction B) Rancidity
C) Acidity D) Corrosion
 
Answer & Explanation Answer: D) Corrosion

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Q:

The number of valence electrons in an atom of Phosphorous is

A) 4 B) 3
C) 2 D) 5
 
Answer & Explanation Answer: D) 5

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Q:

The number of neutrons present in a nitrogen atom is ___.

A) 14 B) 7
C) 11 D) 5
 
Answer & Explanation Answer: B) 7

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Q:

In the Modern Periodic Table elements present in the same period will have the same

A) atomic weight B) number of shells
C) atomic number D) valence electrons
 
Answer & Explanation Answer: B) number of shells

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Q:

Which of the following is added to iron to make iron hard and strong?

A) Zinc B) Copper
C) Carbon D) Sodium
 
Answer & Explanation Answer: C) Carbon

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