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Q:

The mass of one molecule of oxygen is

 

A) 2.3 x 10-23 g B) 3.3 x 10-23 g
C) 4.3 x 10-23 g D) 5.3 x 10-23 g
 
Answer & Explanation Answer: D) 5.3 x 10-23 g

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Q:

Which of the following causes acid rain?

I. SO2

II. NO2

III. CO2

 

A) Only I and II B) Only II and III
C) Only I and III D) All I, II and III
 
Answer & Explanation Answer: A) Only I and II

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Q:

Which is not a green house gas in the following?

 

A) Ozone B) Nitrous oxide
C) Water vapour D) Hydrogen
 
Answer & Explanation Answer: D) Hydrogen

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Q:

Which of the following is used as a catalyst in the hydrogenation of vegetable oil?

 

A) He B) H2
C) Ni D) Pb
 
Answer & Explanation Answer: C) Ni

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Q:

Which of the following statement(s) is/are CORRECT?

I. Acids are sour in taste and generate H+ ions.

II. Acids are sour in taste and generate OH– ions.

III. Bases are bitter intaste and generate OH– ions.

A) Only I and III B) Only I and II
C) Only II and III D) All I, II and III
 
Answer & Explanation Answer: A) Only I and III

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Q:

Which substance is produced when alcohol is added with petrol and used as a fuel?

 

A) Only oxygen B) Only carbon-dioxide
C) Only water D) Carbon-dioxide and water both
 
Answer & Explanation Answer: B) Only carbon-dioxide

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Q:

Which one of the following is the most characteristic property of an element?

 

A) Density B) Boiling point
C) Mass number D) Atomic number
 
Answer & Explanation Answer: D) Atomic number

Explanation:

Atomic  number  is  the  fundamental properties  of  an  element.  Every atom  is  identified  by  its  unique atomic  number.  Atomic  number  is equal  to  the  number  of  protons present in an atom of the element.

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Q:

Which of the following statements is Incorrect?

 

A) The particles of matter have spaces between them B) The particles of matter are extremely small
C) The particles of matter attract each other D) The particles of matter are in stationary state
 
Answer & Explanation Answer: D) The particles of matter are in stationary state

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