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 Chemistry Questions

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Q:

Which method will be employed to test the hardness of water?

A) Boiling B) Distillation
C) Formation of lather with soap D) None of these
 
Answer & Explanation Answer: C) Formation of lather with soap

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Q:

Which among the following is false about acids?

A) They give H+ ions in aqueous solution B) Most acids contain hydrogen
C) They turn blue litmus red D) They are bad conductor of electricity in aqueous solution
 
Answer & Explanation Answer: D) They are bad conductor of electricity in aqueous solution

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Q:

Earth's crust mainly contains ______.

A) bauxite B) manganese
C) silica D) iron
 
Answer & Explanation Answer: C) silica

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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:

Alkenes were earlier known as ______.

A) Paraffins B) Titoffins
C) Olefins D) Meloffins
 
Answer & Explanation Answer: C) Olefins

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Q:

The common name of lead (II) sulphide is

A) borax B) epsom salt
C) galena D) brimstone
 
Answer & Explanation Answer: C) galena

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Q:

Which of the following molecules is joined by a double covalent bond?

A) Cl2 B) O2
C) N2 D) He2
 
Answer & Explanation Answer: B) O2

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Q:

The elements known as primary nutrients for plants

A) Nitrogen, Phosphorus and Potassium B) Nitrogen, Oxygen and Silicon
C) Potassium, Boron and Nitrogen D) Nitrogen, Phosphorus and Iron
 
Answer & Explanation Answer: A) Nitrogen, Phosphorus and Potassium

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