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Q:

Methane an air pollutant is produced ______.

A) by action of ultraviolet light on nitrogenous compounds. B) as a by-product of manufacturing ammoniacal fertilizers
C) by burning of coal in insufficient air D) by digestion of food by animals
 
Answer & Explanation Answer: D) by digestion of food by animals

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Q:

__________gives hardness to stainless steel.

A) Zinc B) Carbon
C) Lead D) Tin
 
Answer & Explanation Answer: B) Carbon

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Q:

The Chemical formula of Acetic acid is _____.

A) CH3COH B) CH3COOH
C) CH3COCH3 D) CH2COOH
 
Answer & Explanation Answer: D) CH2COOH

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Q:

Atomic number of which of the following elements is greater than that of Aluminium?

A) Phosphorus B) Neon
C) Magnesium D) Sodium
 
Answer & Explanation Answer: A) Phosphorus

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Q:

Which of the following compounds is the strongest acid?

A) p-nitrophenol B) phenol
C) m-nitrophenol D) p-cresol
 
Answer & Explanation Answer: A) p-nitrophenol

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Q:

In the reaction H2O2 + Cl2 -----> 2HCl + O2, H2O2 acts as

A) an acid B) an oxidising agent
C) a reducing agent D) a base
 
Answer & Explanation Answer: C) a reducing agent

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Q:

The predominant stage of the life cycle of a moss is the gametophyte which consists of two stages. The second stage is the ___________ stage.

A) Agar B) Leafy
C) Chlorella D) protonema
 
Answer & Explanation Answer: B) Leafy

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Q:

Features and habits that help animals to adapt to their surroundings are a result of the process of ______________.

A) maturation B) evolution
C) progression D) renewal
 
Answer & Explanation Answer: B) evolution

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