5
Q:

What are long chains of Carbon Molecules called

A) Ribosomes B) Hydrocarbons
C) Polymers D) None

Answer:   C) Polymers



Explanation:

A small organic molecule (sugars or amino acids), several of which may be bonded together to form a chain called a polymer.

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Q:

Which properties are characteristic of the group 1 metals?

A) Low melting points B) Produce hydrogen when react with water
C) Soft in nature D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

Group 1 metals are also called as alkali metals with reactive in nature and low melting points. They are soft and produce hydrogen and alkaline metal hydroxide solution when they react with water.

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Q:

Barbituric Acid was synthesized in 1864 by

A) Adolf von Baeyer B) Marie Curie
C) Mendeleev D) John Dalton
 
Answer & Explanation Answer: A) Adolf von Baeyer

Explanation:

German Chemist, Adolf von Baeyer first synthesized Barbituric Acid in 1864.

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1 33
Q:

Which element has the lowest ionization energy?

A) He B) Ne
C) Fr D) Rb
 
Answer & Explanation Answer: C) Fr

Explanation:

Ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms. Atoms are more stable when they have full valence shells.


The ionization energy decreases from top to bottom in groups, and increases from left to right across a period.

 

HGence, in this trend Francium (Fr) has the lowest ionization energy.

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1 39
Q:

The luster of a metal is due to presence of free electrons.

A) TRUE B) FALSE
Answer & Explanation Answer: A) TRUE

Explanation:

True, The luster of a metal is due to presence of free electrons. Luster means shine or soft glow. We know that metals have the quality of reflecting light from its surface.

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0 32
Q:

The compound MgCl2 is named

A) Magnesium Chloride B) Magnesium Chlorine
C) Magnesium Dichloride D) Dimagnesium Chloride
 
Answer & Explanation Answer: A) Magnesium Chloride

Explanation:

The compound MgCl2 is named as Magnesium Chloride.

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0 32
Q:

Radioactive decay is likely to occur when

A) an atom has too many neutrons or protons B) protons break into neutrons and electrons
C) an atom has too many electrons D) atoms collide with one another
 
Answer & Explanation Answer: A) an atom has too many neutrons or protons

Explanation:

Radioactive decay is likely to occur when the nuclei of an atom doesn't have enough binding energy to hold the nucleus together due to excess of rotons or nutrons in it.

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Q:

One turn of the citric acid cycle produces

A) two molecules of carbon dioxide are released B) three molecules of NADH and one molecule of FADH2 are generated
C) one molecule of ATP or GTP is produced D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

One turn of the citric acid cycle produces

 

1. Two molecules of carbon dioxide are released.

2. One molecule of ATP or GTP is produced.

3. Tree molecules of NADH and one molecule of FADH2 are generated.

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0 38
Q:

Which of the following is not a semiconductor?

A) CdS B) NaCl
C) Si D) Ge
 
Answer & Explanation Answer: B) NaCl

Explanation:

Semiconductors are those materials that are neither good conductors nor the good insulators of heat and electricity. Silicon (Si), Germanium (Ge) and Cadmium Sulphide (CdS) are semiconductors which work as conductors in some special conditions only.

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