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Q:

Alkali metals are assigned which group in the Modern Periodic Table?

A) Second group B) Eighteenth group
C) Third group D) First group
 
Answer & Explanation Answer: D) First group

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Q:

Which one of the following elements has the lowest atomic mass?

A) Lithium B) Nitrogen
C) Hydrogen D) Helium
 
Answer & Explanation Answer: C) Hydrogen

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Q:

Atomic mass of Carbon is 12 and that of Helium is 4. State which of the following statements is true for 1 mole of each of the elments?

A) 1 mole of Helium will contain 3 times more atoms than 1 mole of Carbon B) 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium
C) 1 mole of Carbon will contain one-third the number of atoms present in 1 mole of Helium D) 1 mole of Carbon will contain 3 times more atoms than 1 mole of Helium
 
Answer & Explanation Answer: B) 1 mole of Carbon will contain the same number of atoms as present in 1 mole of Helium

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Q:

Identify a use of the isotope of uranium.

A) Fuel in nuclear reactors B) Treatment of goitre
C) Treatment of cancer D) Fuel in aeroplanes
 
Answer & Explanation Answer: A) Fuel in nuclear reactors

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Q:

An element has an atomic weight of W and an atomic number of N. The number of protons in the nucleus of its atom is

 

A) N B) W
C) W + N D) W - N
 
Answer & Explanation Answer: A) N

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Q:

Which of the following salts is acidic in nature?

A) Sodium Carbonate B) Ammonium Phosphate
C) Magnesium Sulphate D) Sadium Acetate
 
Answer & Explanation Answer: A) Sodium Carbonate

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Q:

___ is not a chemical change.

A) Cooking an egg B) Melting an ice cube
C) Baking a cake D) Rotting Bananas
 
Answer & Explanation Answer: B) Melting an ice cube

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Q:

What is the number of atoms constituting a molecule known as?

A) Atomicity B) Atomic mass
C) Atomic number D) Isotopes
 
Answer & Explanation Answer: A) Atomicity

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