Chemistry Questions

Q:

The gases used in different types of welding would include

A) Acetylene B) Oxygen
C) Oxygen and Acetylene D) Nitrogen, Oxygen and Acetylene
 
Answer & Explanation Answer: C) Oxygen and Acetylene

Explanation:

Oxygen and Acetylene are the gases used in different types of welding.

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Q:

Which base is present in lime water?

A) Sodium hydroxide B) Magnesium hydroxide
C) Calcium hydroxide D) Ammonium hydroxide
 
Answer & Explanation Answer: C) Calcium hydroxide

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Q:

Alkali metals can

A) be highly unstable at room temperature B) vaporize at room temperature
C) easily gain electrons D) easily lose electrons
 
Answer & Explanation Answer: D) easily lose electrons

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Q:

Of the following commonly used materials, the one that is not an alloy is

A) Steel B) Brass
C) Bronze D) Copper
 
Answer & Explanation Answer: D) Copper

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Q:

30 litres of salt solution contains 5% salt. How many litres of water must be added so as to get a resultant solution containing 3%salt?

A) 20 litres B) 25 litres
C) 30 litres D) 35 litres
 
Answer & Explanation Answer: A) 20 litres

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Q:

Which of the follow is the last element in Newlands Law of Octaves classification?

A) Rhodium B) Radium
C) Iron D) Thorium
 
Answer & Explanation Answer: D) Thorium

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Q:

Chemical Formula of Water is _____ .

A) O2H B) OH
C) HO D) H2O
 
Answer & Explanation Answer: D) H2O

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Q:

In a compound the elements are always present in definite proportions by ______

A) mass B) volume
C) size D) No option is correct
 
Answer & Explanation Answer: A) mass

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