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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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Q:

A solution that is at equilibrium must be

A) saturated B) concentrated
C) unsaturated D) dilute
 
Answer & Explanation Answer: A) saturated

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2 976
Q:

The pH of a solutiion is 3. When its pH changes to 6, then H+ ion concentration

A) increases 2 times B) increases 3 times
C) decreases 1000 times D) decreases 100 times
 
Answer & Explanation Answer: C) decreases 1000 times

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3 816
Q:

Atomic mass of Carbon is 12 and that of Helium is 4. State which of the following statements is true for 1 mole of each of the elments?

A) 1 mole of Helium will contain 3 times more atoms than 1 mole of Carbon B) 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium
C) 1 mole of Carbon will contain one-third the number of atoms present in 1 mole of Helium D) 1 mole of Carbon will contain 3 times more atoms than 1 mole of Helium
 
Answer & Explanation Answer: B) 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium

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0 634
Q:

How many atoms are present in one molecule of Ozone?

A) 4 B) 1
C) 2 D) 3
 
Answer & Explanation Answer: D) 3

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1 852
Q:

The molecular formula of Propane is

A) C2H6 B) C4H10
C) C3H8 D) CH4
 
Answer & Explanation Answer: C) C3H8

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0 911
Q:

Which of the following gases is used to prevent food material from getting oxidised?

A) Oxygen B) Chlorine
C) Nitrogen D) Hydrogen
 
Answer & Explanation Answer: C) Nitrogen

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0 725
Q:

Except Helium, all noble gases have how many electrons in the outermost shell?

A) 4 B) 8
C) 6 D) 10
 
Answer & Explanation Answer: B) 8

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1 700
Q:

The metal that can be cut with a knife is

A) Sodium B) Iron
C) Aluminium D) Copper
 
Answer & Explanation Answer: A) Sodium

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