Chemistry Questions

Q:

Which one of the following laws directly expalins the law of coservation of mass

A) Hund's rule B) Dalton's law
C) Avogadro's law D) Berzelius hypothesis
 
Answer & Explanation Answer: C) Avogadro's law

Explanation:
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Q:

The Gas used for Artificial Ripening of Green Fruit is

A) Acetone B) Di Carbonate
C) Ethylene D) Ethyl Alcohol
 
Answer & Explanation Answer: C) Ethylene

Explanation:

Ethylene is used for Artificial Ripening of Green Fruit.

    • Calcium carbide is also used in some countries for artificially ripening fruit. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite similar in its effects to the natural ripening agent, ethylene

 

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Q:

Of the following radiations, the most easily stopped by air

A) alpha - rays B) beta - rays
C) gamma -rays D) x - rays
 
Answer & Explanation Answer: A) alpha - rays

Explanation:
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Q:

The oldest known organic compound is

A) Urea B) Methane
C) Acetic acid D) Benzene
 
Answer & Explanation Answer: C) Acetic acid

Explanation:

In the form of vinegar, acetic acid is known from very early times. It is got by oxidation of fermented liquors (10-15%, alcohol) by air under the influence of a bacteria called 'mycoderma acetic'

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Q:

Which best describes an element?

A) An element is composed of identical atoms B) A pure substance
C) a material that has consistent chemical properties D) Both A & B
 
Answer & Explanation Answer: D) Both A & B

Explanation:

An Element is a pure substance of one type of atom. In chemistry, any material such as carbon, hydrogen, iron, or oxygen that cannot be broken down into more fundamental substances is nothing but an element.

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Q:

Chemical name of Gold?

A) Argentinum B) Ferrus
C) Aurum D) Selenium
 
Answer & Explanation Answer: C) Aurum

Explanation:

The Chemical name of Gold is Aurum with symbol Au with atomic number 79 and a group 11 element. In its purest form, it is a bright, slightly reddish yellow, dense, soft, malleable, and ductile metal.

Chemically, gold is a transition metal.

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Q:

The atoms of the elements having same mass number but different atomic number are called

A) Isotopes B) Isobars
C) Isotones D) Isomers
 
Answer & Explanation Answer: B) Isobars

Explanation:
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Q:

Is Nitrogen an Inert gas?

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

Explanation:

Nitrogen is found as a diatomic molecule (N2) in nature. There is a triple bond between the two nitrogen atoms.


 


The triple bond is pretty strong. Therefore, it needs a lot of energy to break those bonds and participate in a reaction. So nitrogen is commonly referred to as and used as an inert gas (high abundance & low cost.) However, it’s not truly inert like most noble gases. Nitrogen does react if the conditions are met. But those conditions are not exactly mild, but are not as extreme as for noble gases.


 


It forms nitric oxide and nitrogen dioxide with oxygen, ammonia with hydrogen, and nitrogen sulfide with sulfur.

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