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Q:

Why do atoms bond?

A) To reduce potential energy and gain stability B) To make atoms
C) To increase potential energy and lose stability D) To increase potential energy and gain stability
 
Answer & Explanation Answer: A) To reduce potential energy and gain stability

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Q:

Which of the following gases is produced due to incomplete combustion of fuel?

A) Carbon Dioxide B) Carbon Monoxide
C) Methane D) Ethane
 
Answer & Explanation Answer: B) Carbon Monoxide

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Q:

Among chemical properties, Mendeleev concentrated on the compounds formed by the elements with

A) Hydrogen and Oxygen B) Hydrogen and Sodium
C) Carbon and Hydrogen D) Carbon and Sodium
 
Answer & Explanation Answer: A) Hydrogen and Oxygen

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Q:

Sphalerite is an ore/mineral of

A) Mercury B) Molybdenum
C) Silver D) Zinc
 
Answer & Explanation Answer: D) Zinc

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Q:

Chemical properties of isotopes .............

A) must be same B) must be different
C) need not be same D) need not be different
 
Answer & Explanation Answer: A) must be same

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Q:

What happens when one S and one P orbital is hybridized?

A) We get three orbitals in a plane B) We get two orbitals at 180 degrees
C) We get two mutually perpendicular orbitals D) We get four orbitals directed tetrahedrally
 
Answer & Explanation Answer: B) We get two orbitals at 180 degrees

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Q:

What is the chemical name of chalk?

A) Calcium Sulphate B) Calcium Nitrate
C) Calcium Carbonate D) Calcium Phosphide
 
Answer & Explanation Answer: C) Calcium Carbonate

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Q:

Which among the following difference between aerobic and anaerobic respiration is INCORRECT?

A) Aerobic respiration takes place in presence of oxygen – Anaerobic respiration takes place in the absence of oxygen   B) In Aerobic respiration pyruvate is broken down into ethanol and carbon dioxide – In Anaerobic respiration pyruvate is broken down into carbon dioxide and water
C) In Aerobic respiration more energy is released – In Anaerobic respiration less energy is released   D) Aerobic respiration takes place in mitochondria– Anaerobic respiration takes place in yeast  
 
Answer & Explanation Answer: B) In Aerobic respiration pyruvate is broken down into ethanol and carbon dioxide – In Anaerobic respiration pyruvate is broken down into carbon dioxide and water

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