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Q:

On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because ________

A) Mercury is a metal B) Density of mercury is greater than that of water
C) Cohesion of mercury is greater than its adhesion with glass D) Cohesion of water is greater than its adhesion with glass
 
Answer & Explanation Answer: C) Cohesion of mercury is greater than its adhesion with glass

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Q:

Aqueous solution of copper sulphate?

A) does not affects litmus B) affects both red and blue litmus
C) turns blue litmus red D) turns red litmus blue
 
Answer & Explanation Answer: C) turns blue litmus red

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Q:

Which of the following metals is a liquid at room temperature?

A) Lithium B) Mercury
C) Sodium D) Calcium
 
Answer & Explanation Answer: C) Sodium

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Q:

Which of the following processes will take place the slowest for the same quantity of liquid?

A) Boiling B) Condensation
C) Evaporation D) Freezing
 
Answer & Explanation Answer: C) Evaporation

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Q:

What is the chemical formula of Ozone?

A) O B) O2
C) O3 D) O4
 
Answer & Explanation Answer: C) O3

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Q:

Two or more elements combine to form a

A) atom B) valency
C) compound D) radical
 
Answer & Explanation Answer: C) compound

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Q:

What is the pH value of human blood?

A) 8.3 B) 6.8
C) 7.4 D) 6
 
Answer & Explanation Answer: C) 7.4

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Q:

Aluminium oxide is ___ in nature.

A) amphoteric B) acidic 
C) neutral D) basic
 
Answer & Explanation Answer: A) amphoteric

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