12
Q:

Which of the following is also known as Carbolic Acid?

A) Hydroxide B) Sulphuric Acid
C) Ethanol D) Phenol

Answer:   D) Phenol



Explanation:

Phenol with a molecular formula [C6H5OH] is also called as Carbolic Acid. It is a white poisonous clear compound with sweet smell. It is used in making plastics, detergents and drugs.

Subject: Chemistry
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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

Explanation:
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Q:

What is the relative molecular mass of water?

A) 8 u B) 9 u
C) 16 u D) 18 u
 
Answer & Explanation Answer: D) 18 u

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Q:

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

I. Alkenes are fairly unreactive.

II. Alkenes burn with blue flame.

III. Alkanes burn with yellow flame.

 

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

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Q:

Atomic number is always equal to ______.

A) Number of protons B) Number of neutrons
C) Number of electrons D) Sum of protons and neutrons  
 
Answer & Explanation Answer: A) Number of protons

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Q:

Which process usually requires water?

A) Physical weathering B) Mass wasting
C) Chemical weathering D) Erosion
 
Answer & Explanation Answer: C) Chemical weathering

Explanation:

Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts. These reactions occur particularly when the water is slightly acidic.

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Q:

In hydrolysis reactions compounds react with

A) carbon, causing decomposition B) glucose, causing decomposition
C) water, causing decomposition D) hydrogen, causing decomposition
 
Answer & Explanation Answer: C) water, causing decomposition

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Q:

The atoms of the elements having same difference between mass number and atomic number are called ______.

A) Isobar B) Isotopes
C) Isotones D) No option is correct
 
Answer & Explanation Answer: C) Isotones

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Q:

Electrons can be deflected by which of the following?

A) Only magnetic field B) Only electric field
C) Both magnetic and electric field D) No option is correct
 
Answer & Explanation Answer: C) Both magnetic and electric field

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