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 Chemistry Questions

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Q:

Which of the following induces souring of milk?

A) Acetic Acid B) Citric Acid
C) Ascorbic Acid D) Lactic Acid
 
Answer & Explanation Answer: D) Lactic Acid

Explanation:
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Q:

What is the value of triple point (solid, liquid and gas) of Water?

A) 273.16° C B) -273.16 K
C) 273.16 K D) 0° C
 
Answer & Explanation Answer: C) 273.16 K

Explanation:

The temperature at which a substance can exist in equilibrium in the liquid, solid, and gaseous states. The triple point of pure water is at 0.01°C (273.16K, 32.01°F).

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Q:

Which of the following elements has the lowest melting point?

A) Xenon B) Iodine
C) Barium D) Magnesium
 
Answer & Explanation Answer: A) Xenon

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Q:

Which one of the following elements is essential for the formation of chlorophyll in green plants?

A) Calcium B) Iron
C) Magnesium D) Potassium
 
Answer & Explanation Answer: C) Magnesium

Explanation:

Forms taken up by plants: Mg++ Functions in plants: a part of the chlorophyll molecule -essential in photosynthesis: related to phosphorus metabolism: large quantities found in seed.Mg deficiency symptoms: Mg is mobile, so symptoms occur first in old leaves; A whitish or yellowish striping effect on grasses.

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Q:

Which of the following is also used as a Bio fertilizer?

A) Urea B) Ammonia
C) Uric Acid D) Nitrates
 
Answer & Explanation Answer: B) Ammonia

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Q:

The Chemical formula of Ammonium sulphate is

A) NH4SO4 B) (NH4)2SO3
C) NH4SO3 D) (NH4)2SO4
 
Answer & Explanation Answer: D) (NH4)2SO4

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Q:

The upper part of the heterosphere is composed almost completely of which gas?

A) Ozone B) Nitrogen
C) Oxygen D) Hydrogen
 
Answer & Explanation Answer: D) Hydrogen

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Q:

Which of the following elements has the electronic configuration 2, 8, 3?

A) Magnesium B) Sodium
C) Aluminium D) Argon
 
Answer & Explanation Answer: C) Aluminium

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