Chemistry Questions

Q:

What is the Iupac name for the compound shown below.

                           clbr1527920257.png image

A) 1-Bromo-3-chlorocyclohexene B) 2-Bromo-6-chlorocyclohex-1-ene
C) 6-Bromo-2-chlorocyclohexene D) 3-Bromo-1-chlorocyclohex-1-ene
 
Answer & Explanation Answer: D) 3-Bromo-1-chlorocyclohex-1-ene

Explanation:

In chemical nomenclature, the IUPAC nomenclature of organic chemistry is a systematic method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC).

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Q:

Is C2 Paramagnetic or Diamagnetic?

A) Paramagnetic B) Diamagnetic
C) Ferromagnetic D) Can't be determined
 
Answer & Explanation Answer: B) Diamagnetic

Explanation:

Paramagnetic Molecules ::

 

If the Electronic configuration of a molecule has any unpaired electrons, then that molecule is said to be Paramagnetic.

 

Diamagnetic Molecules ::

 

If the Electronic configuration of a molecule has only paired or spin paired electrons, then that molecule is said to be Diamagnetic.

 

Is_C2_Paramagnetic_or_Diamagnetic1556263140.jpg image 

 

Here the molecule C2 has all paired electrons in its electronic configuration. So C2 is Diamagnetic.

 

Whereas, B2 molecule has unpaired electrons. So B2 is Paramegnetic.

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Q:

 A mixture of sand and naphthalene can be separated by

A) Fractional distillation B) Sublimation
C) Chromatography D) Any of them
 
Answer & Explanation Answer: B) Sublimation

Explanation:
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Q:

Mg+O2=MgO

Balance the above Chemical equation?

A) 2Mg + O2 ----> 2MgO B) 2Mg + O ----> 2MgO
C) 2Mg + O ----> MgO2 D) 2Mg + O2 ----> MgO2
 
Answer & Explanation Answer: A) 2Mg + O2 ----> 2MgO

Explanation:

Given Equation is 

Mg + O2  MgO

Balancing the Chemical Equation is nothing but Conservation of Matter. As Matter is Neither created nor Destroyed, it must be conserved.

Here we have 1 Mg and 2 O on the left side and 1 Mg and 1 O on the right side

To balance that, add 1 Mg on the left side so that it becomes 2 Mg and 2 O on the left side

i.e,

2 Mg + O2  2 MgO

Here it has 2 Mg & 2 O on the left side and 2 Mg and 2 O on the right side and the Chemical equation is Balanced.

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Q:

' Yellow cake ' an item of smuggling across border s

A) A crude form of heroin B) A crude form of cocaine
C) Uranium oxide D) Unrefined gold
 
Answer & Explanation Answer: C) Uranium oxide

Explanation:
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Q:

What is the third most common gas found in the air we breathe ?

A) Argon B) Neon
C) Carbondioxide D) Hydrogen
 
Answer & Explanation Answer: A) Argon

Explanation:

The most common gas people breathe from clean air is nitrogen. Air is a mixture of gases, and the air on Earth contains about 78 percent nitrogen and about 21 percent oxygen. Argon, carbon dioxide neon, helium, methane, krypton, hydrogen and xenon are in much smaller amounts.

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Q:

Cobalt - 60 is commonly used in radiation therapy because it emits

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

Explanation:
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Q:

Which one of the following substances does not have a melting point

A) bromine B) sodium chloride
C) mercury D) glass
 
Answer & Explanation Answer: D) glass

Explanation:
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