Chemistry Questions

Q:

Which of the following is a correct pair according to increasing atomic number from left to right?

A) He, H B) Na, Ne
C) Be, B D) Ca, Cl
 
Answer & Explanation Answer: C) Be, B

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Q:

Which of the following type of medicine is used to treat indigestion?

A) Sulpha drug B) Antihistamine
C) Antibiotic D) Antacid
 
Answer & Explanation Answer: D) Antacid

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Q:

What are transition elements?

A) Elements whose two outermost shells are incomplete B) Elements which possess properties of both, metals and non-metals
C) They have eight electrons in the outermost shell D) Elements whose three outermost shells are incomplete
 
Answer & Explanation Answer: A) Elements whose two outermost shells are incomplete

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Q:

Least distance of distinct vision for normal eye is

A) 15 cm B) 20 cm
C) 25 cm D) 30 cm
 
Answer & Explanation Answer: C) 25 cm

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Q:

According to Newlands' law of Octaves, how many elements exist in nature?

A) 56 B) 66
C) 55 D) 65
 
Answer & Explanation Answer: A) 56

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Q:

Which of the following metals does NOT react with Oxygen even at a high temperature?

A) Silver B) Lead
C) Aluminium D) Zinc
 
Answer & Explanation Answer: A) Silver

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Q:

Rupee 5 and 10 coins are now made of

A) Ferritic stainless steel B) Silver and steel
C) Cupro nickel alloy D) Copper and brass
 
Answer & Explanation Answer: C) Cupro nickel alloy

Explanation:

The copper nickel alloys composed of copper with 25% nickel with 0.05-0.4% manganese is commonly used for the manufacture of coins, medals and other semi valuable applications.

 

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Q:

In the Modern Periodic Table, a zig-zag line separates

A) metals from halogens B) non-metals from metalloids
C) metals from non-metals D) metals from metalloids
 
Answer & Explanation Answer: C) metals from non-metals

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