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 Chemistry Questions

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Q:

Which gas is not produced by volcanic eruptions?

A) Methane B) carbon dioxide
C) sulfur dioxide D) hydrochloric acid
 
Answer & Explanation Answer: A) Methane

Explanation:

Many toxic gases along with water vapour are emitted in vocanic eruptions. All such toxic gases include hydrochloric acid, sulfur dioxide, carbon dioxide, hydrogen sulfide and carbon monoxide. Methane is not produced in the volcanic eruptions.

which_gas_is_not_produced_by_volcanic_eruptions1559201445.jpg image

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Q:

Compounds are formed as a result of chemica change.

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

Explanation:

TRUE, the compounds are formed as a result of chemical change.

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Q:

Which has the lowest freezing point?

A) Mercury B) Helium
C) Cesium D) Aluminium
 
Answer & Explanation Answer: B) Helium

Explanation:

Helium has the lowest freezing point of all the elements. When coming to metals, mercury has the lowest freezing point of all the metals.

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Q:

Ozone is concentrated in the

A) Stratosphere B) Troposphere
C) Ionosphere D) Mesosphere
 
Answer & Explanation Answer: A) Stratosphere

Explanation:

Most of the ozone in the atmosphere is found in the layer of stratosphere, which begins about 10.16 kilometers (6.10 miles) above Earth's surface and extends up to about 50 kilometers (31 miles) altitude.

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Q:

Which of these is ATP?

A) 3 Phosphate groups attached to chromosome attached to Adenine B) 3 Phosphate groups attached to a Ribose attached to Adenine
C) 3 Phosphate groups attached to a Ribose attached to Thymine D) None of the above
 
Answer & Explanation Answer: B) 3 Phosphate groups attached to a Ribose attached to Adenine

Explanation:

ATP is a Adenosine Triphosphate.

 

ATP is 3 Phosphate groups attached to a Ribose attached to Adenine.

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Q:

Which kind of energy is stored in a chemical bond?

A) Potential energy B) Kinetic energy
C) Both A & B D) None of the above
 
Answer & Explanation Answer: A) Potential energy

Explanation:
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Q:

The current atomic model would be revised if 

A) better microscopes are invented in the future B) a new element is discovered in the future
C) better microscopes were being used to study its structure D) new information about an atoms structure is discovered
 
Answer & Explanation Answer: D) new information about an atoms structure is discovered

Explanation:
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Q:

The reactivity of an atom arises from

A) the existence of unpaired electrons in the valence shell B) the potential energy of the valence shell
C) the average distance of the outermost electron shell from the nucleus D) the sum of the potential energies of all the electron shells
 
Answer & Explanation Answer: A) the existence of unpaired electrons in the valence shell

Explanation:

The reactivity of an atom arises from the existence of unpaired electrons in the valence shell.

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