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Q:

The metal which reacts most violently with with cold water is

A) calcium B) sodium
C) magnesium D) potassium

Answer:   D) potassium



Explanation:

Potassium reacts violently with water liberating hydrogen. The reaction is so violent that the liberated hydrogen catches fire.

Subject: Chemistry
Q:

Which of the following is not soluble in water?

A) copper(II) hydroxide B) sodium chloride
C) silver nitrate D) potassium sulfate
 
Answer & Explanation Answer: A) copper(II) hydroxide

Explanation:

Sodium chloride:

The solubility rules tell you that all halides are soluble with the exception of those formed with siver, mercury, and lead ions. Since this is not the case here, sodium chloride will be soluble.

 

Silver nitrate:

It is soluble because all nitrates are soluble, without exception.

 

Potassium sulfate:

It is soluble because all sulfates are soluble with the exception of those formed with silver, calcium, barium, mercury, lead, and strontium ions.

 

Copper (II) hydroxyde:

It is insoluble because all hydroxides are insoluble with the exception of those formed with alkali metal ions and barium.

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Q:

Which of the following carbohydrates is a polysaccharide?

A) Fructose B) Cellulose
C) Glucose D) Sucrose
 
Answer & Explanation Answer: B) Cellulose

Explanation:

Carbohydrates are also called as saccharides are molecular compounds made from just three elements:

carbon, hydrogen and oxygen.

 

Carbohydrates are:

* a source of energy for the body e.g. glucose and a store of energy, e.g. starch in plants

* building blocks for polysaccharides (giant carbohydrates), e.g. cellulose in plants and glycogen in the human body

* components of other molecules eg DNA, RNA, glycolipids, glycoproteins, ATP

 

Types:

1. Monosaccharides (e.g. glucose) and

2. Disaccharides (e.g. sucrose) are relatively small molecules. They are often called sugars.

3. Other carbohydrate molecules are very large called Polysaccharides such as starch and cellulose.

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Q:

Why are hydrocarbons insoluble in water?

Answer

We know that polar substances are soluble in polar solvents and non polar substances are soluble in non-polar solvents only. Here the hydrocarbons are non-polar molecular substances and water is a polar solvent. So water can't dissolve hydrocabons.


 


Hence, as hydrocarbons are non-polar substances, they are insoluble in water as it is a highly polar solvent. 

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Q:

Tertiary structure is NOT directly dependent on

A) hydrogen bonds B) ionic bonds
C) peptide bonds D) hydrophobic interactions
 
Answer & Explanation Answer: C) peptide bonds

Explanation:
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Q:

Which of the following polysaccharides contains a modified monosaccharide?

A) starch B) chitin
C) glycogen D) cellulose
 
Answer & Explanation Answer: B) chitin

Explanation:

Many carbohydrates contain one or more modified monosaccharide units that have had one or more groups replaced or removed.

 

Chitin is one of many naturally occurring polymers. It is one of the most abundant natural materials in the world. Over time it is bio-degradable in the natural environment. Its breakdown may be catalyzed by enzymes called chitinases, secreted by microorganisms such as bacteria and fungi, and produced by some plants.

 

Chitin is composed of repeating units of N-acetylglucosamine, a nitrogen-containing form of glucose.

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Q:

Which path through the carbon cycle is possible?

A) Animal ----> Plant ----> Atmosphere B) Plant ----> Animal ----> Atmosphere
C) Atmosphere ----> Plant ----> Animal D) Plant ----> Atmosphere -----> Animal
 
Answer & Explanation Answer: B) Plant ----> Animal ----> Atmosphere

Explanation:

During daylight hours, plants capture carbon dioxide from the atmosphere and use it to make carbohydrates which is stored as starch in the plant. Animals feed on the plants and extract the carbohydrates through their digestive system. The carbohydrates, namely glucose, are used by the animals for production of ATP through cellular respiration.

 

Cellar respiration in the animals produces carbon dioxide as a waste product. The carbon dioxide is released into the atmosphere, from where it is again captured by plants and the cycle is repeated.

 

Hence, option B) Plant ----> Animal ----> Atmosphere is the path possible in carbon cycle.

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Q:

Which of the following is a polymer?

A) Glycerol B) Amino acid
C) Nucleic acid D) Fatty acid
 
Answer & Explanation Answer: C) Nucleic acid

Explanation:

Nucleic acid is a polymer among the given options.

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Q:

Which statement is NOT true about polymers?

A) Polymers are large molecules composed of small monomeric units B) Polymes are macromolecules
C) Polymers are complex molecules composed of random sequences of atoms D) All the above
 
Answer & Explanation Answer: C) Polymers are complex molecules composed of random sequences of atoms

Explanation:

Polymers are complex molecules composed of random sequences of atoms is the only statement which is not true regarding polymers.

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