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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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Q:

Which of the following statements is Incorrect?

A) Atomic size increases from top to bottom B) All the elements of a group have same valency
C) Isotopes of the same elements are placed in the same group D) Atomic radius generally decreases from left to right
 
Answer & Explanation Answer: C) Isotopes of the same elements are placed in the same group

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Q:

Which of the following gases makes bread or cake rise making them soft and spongy?

A) CO B) CO2
C) H2 D) O2
 
Answer & Explanation Answer: B) CO2

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Q:

Which of the following is a correct pair according to increasing atomic number from left to right?

A) He, H B) Na, Ne
C) Be, B D) Ca, Cl
 
Answer & Explanation Answer: C) Be, B

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Q:

___ is one of the states of matter obtained by cooling a gas of very low density to extremely low temperatures.

A) Gas B) Plasma
C) Bose-Einstein Condensate (BEC) D) Plasma Condensate
 
Answer & Explanation Answer: C) Bose-Einstein Condensate (BEC)

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Q:

For dilution of a concentrated acid, we should add:

A) water into the diluted acid B) water into the concentrated acid
C) first water into the acid and then more acid into the water D) concentrated acid into water
 
Answer & Explanation Answer: B) water into the concentrated acid

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Q:

___ is used as a stabilizer in ice cream.

A) Gelatin B) Sugar
C) Milk D) Strawberry
 
Answer & Explanation Answer: A) Gelatin

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Q:

According to Newlands' law of Octaves, how many elements exist in nature?

A) 56 B) 66
C) 55 D) 65
 
Answer & Explanation Answer: A) 56

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