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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:

The number of valence electrons in an atom of Phosphorous is

A) 4 B) 3
C) 2 D) 5
 
Answer & Explanation Answer: D) 5

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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 charge is present on a neutron?

A) positive B) negative  
C) no charge D) No option is correct
 
Answer & Explanation Answer: C) no charge

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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:

Given in the options are sets of particular characteristics of elements and how they vary across the period and down the group in the following format:

 

Characteristic of an element  -  Across the period  -  Down the group

 

 

A) Electropositive Character/metallic character - Increase - Decrease B) Electropositive Character/metallic character - Increase - Increase
C) Electropositive Character/metallic character - Decrease - Increase D) Electropositive Character/metallic character - Decrease - Decrease
 
Answer & Explanation Answer: C) Electropositive Character/metallic character - Decrease - Increase

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Q:

The state of matter can be changed into another state by changing the

A) Volume B) Density
C) Shape D) Temperature
 
Answer & Explanation Answer: D) Temperature

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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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