Chemistry Questions

Q:

Atomic numbers of four elements are as follows : F(9), P(15), Cl(17), Ar(18). Which of the following two elements would be chemically similar?

A) F and Ar B) Cl and P
C) F and P D) F and Cl
 
Answer & Explanation Answer: D) F and Cl

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Q:

Non-metal oxides are usually

A) acidic B) amphoteric
C) neutral D) basic
 
Answer & Explanation Answer: A) acidic

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Q:

What is the action of dry HCl gas on dry litmus paper?

A) Blue litmus paper turns white B) Blue or red litmus paper does not change its colour
C) Blue litmus paper turns red D) Red litmus paper turns blue
 
Answer & Explanation Answer: B) Blue or red litmus paper does not change its colour

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Q:

Name the Russian chemist who stated that the properties of elements are a periodic function of their atomic masses?

A) Markovnikov B) Zelinsky
C) Mendeleev D) Zaitsev
 
Answer & Explanation Answer: C) Mendeleev

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Q:

The pH of a solution, whose hydrogen ion concentration is 1 x 10 mole per litre, will be ____.

A) 7 B) 5
C) 4 D) 6
 
Answer & Explanation Answer: B) 5

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Q:

Which one of the following is a bad Thermal Conductor?

A) Aluminium B) Copper
C) Glass D) Silver
 
Answer & Explanation Answer: C) Glass

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Q:

Which of the following is called Aurum?

A) Bronze B) Gold
C) Silver D) Copper
 
Answer & Explanation Answer: B) Gold

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Q:

Which of the following elements replaced eka-Aluminium in Mendeleev's Periodic table?

A) Scandium B) Gallium
C) Titanium D) Germanium
 
Answer & Explanation Answer: B) Gallium

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