Chemistry Questions

Q:

Elements A, B and C occur as Dobereiners triads. If the atomic mass of A is 7 and that of C is 39, what will be the atomic mass of B?

A) 20 B) 40
C) 23 D) 12
 
Answer & Explanation Answer: A) 20

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Q:

Which of the following elements has the lowest melting point?

A) Platinum B) Carbon
C) Cobalt D) Krypton
 
Answer & Explanation Answer: D) Krypton

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Q:

What is contained in Chlorophyll ?

A) sodium B) potassium
C) manganese D) magnesium
 
Answer & Explanation Answer: D) magnesium

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Q:

Which of the following elements has the lowest melting point?

A) Iodine B) Lead
C) Tin D) Mercury
 
Answer & Explanation Answer: D) Mercury

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Q:

What chemical is injected into a person's body when an ant bites?

A) Formic Acid B) Acetic Acid
C) Tartaric Acid D) Citric Acid
 
Answer & Explanation Answer: A) Formic Acid

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Q:

The reactions in which oxidation and reduction occur simultaneously are called _______.

A) Feral reactions B) Redox reactions
C) Demug reactions D) Kerol reactions
 
Answer & Explanation Answer: B) Redox reactions

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Q:

Chemical formula for sulphurous acid is:

A) H2SO4 B) H2SO3
C) H3SO3 D) H3SO4
 
Answer & Explanation Answer: B) H2SO3

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Q:

Constantan is alloyed from ...... metals.

A) Ni, Ti, Fe, Cr B) Cu, Ni, Mn
C) Ni, Cr, Mn, Fe D) Cu, Ni
 
Answer & Explanation Answer: D) Cu, Ni

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