Chemistry Questions

Q:

The salt concentration (measured as salinity in parts per thousand), is greater than _______ % in hypersaline lagoons.

A) 50 B) 100
C) 150 D) 200
 
Answer & Explanation Answer: B) 100

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Q:

Rust is formed from iron and

A) Carbon B) Oxygen
C) Hydrogen D) All of the above
 
Answer & Explanation Answer: B) Oxygen

Explanation:

Rust is formed from iron and oxygen.

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Q:

The temperature at which a solid melts to become a liquid at the atmospheric pressure is called its ___________.

A) Crystallisation B) Melting point
C) Evaporation D) Galvanisation
 
Answer & Explanation Answer: B) Melting point

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Q:

Which of the following elements has the lowest melting point?

A) Oxygen B) Platinum
C) Sodium D) Tin
 
Answer & Explanation Answer: A) Oxygen

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Q:

When ice cubes are made, the entropy of water

A) does not change B) decreases
C) increases D) may either increase or decrease depending on the process used
 
Answer & Explanation Answer: B) decreases

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Q:

Hydrogenation process is associated with which of the following?

A) Rubber B) Petroleum
C) Copper D) Edible fats
 
Answer & Explanation Answer: D) Edible fats

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Q:

Which is the only non-metal placed at the left side of the Modern Periodic Table?

A) Hydrogen B) Carbon
C) Neon D) Helium
 
Answer & Explanation Answer: A) Hydrogen

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Q:

Which of the following elements has the lowest melting point?

A) Chromium B) Hydrogen
C) Zinc D) Silver
 
Answer & Explanation Answer: B) Hydrogen

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