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 Chemistry Questions

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Q:

Which of the following is applied on the top of the matchsticks?

A) Red phosphorus B) White phosphorus
C) Potassium sulphate D) No option is correct
 
Answer & Explanation Answer: A) Red phosphorus

Explanation:
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Q:

The monomer/monomers used for the synthesis of Nylon 6 is/are

A) hexamethylenediamine and adipic acid B) caprolactam
C) urea and formaldehydeD. D) phenol and formaldehyde
 
Answer & Explanation Answer: A) hexamethylenediamine and adipic acid

Explanation:

Nylon is made when the appropriate monomers (the chemical building blocks which make up polymers) are combined to form a long chain via a condensation polymerisation reaction. The monomers for nylon 6-6 are adipic acid and hexamethylene diamine

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Q:

The phosphorus cycle differs from the biogeochemical cycles in that

A) does not have atmospheric reservoir B) uses water more
C) have atmospheric reservoir D) None of the above
 
Answer & Explanation Answer: A) does not have atmospheric reservoir

Explanation:

Unlike other gas cycles, the phosphorus cycle differs in having atmospheric reservoir. No other gases are involved in it.

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Q:

Which of the following is one of the commercial products obtained from Gelidium and Gracilaria and are used to grow microbes and in preparations of ice- creams and jellies?

A) Agar B) Chlorella
C) Spirullina D) Gymnosperms
 
Answer & Explanation Answer: A) Agar

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Q:

Alpha particles are ___________.

A) twice the mass of beta particles B) negatively charged
C) just like helium nuclei D) lower in ionizing power as compared to gamma rays
 
Answer & Explanation Answer: C) just like helium nuclei

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Q:

Barium loses ____ electrons to achieve noble gas electron configuration.

A) 1 B) 2
C) 3 D) 4
 
Answer & Explanation Answer: B) 2

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Q:

Which molecule is used up in photosynthesis?

A) Water B) Carbohydrates
C) Oxgen D) Sugar
 
Answer & Explanation Answer: A) Water

Explanation:

The first step in photosynthesis is to split the water molecule using sun light.

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Q:

Which one of the following is an ohmic conductor?

A) Germanium B) Silicon
C) Carbon D) Silver
 
Answer & Explanation Answer: D) Silver

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