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This is the second of our many quizzes on Dot structures. Click on this to access more such competitive quizzes on Physical Chemistry.

Dot structures Quiz 2

chemistry

 Identify the correct Lewis structure or dot structure of hydrogen peroxide among the following options.

  In dot or Lewis structures the lone pair of electrons on the atoms is supposed to represent with two dots. Two dots are nothing but two unpaired electrons.

  The molecular formula of hydrogen peroxide is ${{H}_{2}}{{O}_{2}}$. We know that oxygen will form two bonds with other atoms and after bonding also oxygen will have two lone pairs of non bonding electrons on it.

   In the following structures which molecule contains +1 charge on nitrogen?<img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/1b38b1d4-2863-4a1a-8e0c-dceb7c1f92d44658771169465517341.png"/>

  Nitrogen has a valence of three electrons and forms three bonds with other atoms. 

 If nitrogen is bonded with four atoms then the central nitrogen atom will have a charge of ‘+1’ on it.

  Carbon monoxide $(\text{CO})$ is a gas released into the environment from automobiles. CO is going to release into the environment due to improper combustion of fuel. What is the formal charge on carbon in carbon monoxide?

 The structure of carbon monoxide is $:C\equiv O:$ 

 In the structure of CO $(\text{carbon monoxide})$ there is a presence of two electrons on the carbon means carbon contains a formal charge of ‘-1’.

  Which of the following chemicals have a central atom which has a ‘0’ charge on it? <img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/3fcad0a8-4e6b-4818-ac5f-e2706fb44c969057950301684665341.png"/><img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/f4a0ea73-62af-4388-af6c-76e412186ed13251384947856774295.png"/><img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/73083c8d-771d-460d-b226-75e24bf00374269431634647254767.png"/>

 If the valence is satisfied in any molecule then the charge on the molecule will be zero. 

 In the given molecule-I, the oxygen has three bonds which means a formal charge of ‘+1’ on it. In the molecule-II, the nitrogen has three bonds then the formal charge is zero. In the molecule-III the bond has three bonds and contains a formal charge of zero.

  Which of the following compounds contains an oxygen with ‘+1’ formal charge?<br><img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/ca10ee17-57d8-4900-8b0b-0c9f37254094927319582940073118.png"/>	 <img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/bab9aeee-2966-4d40-b594-3f8bc71fc6ed2049448100621621342.png"/>	<img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/e6dae486-5ab0-4063-8640-b0650bedd0963720266469246635356.png"/>   <img  src="https://cmds-vedantu.s3.ap-southeast-1.amazonaws.com/prod/question-sets/f5f1809e-a523-4db4-8dcd-8862dc6c16f98119820668808080016.png"/>

 Generally oxygen forms two bonds with others. If oxygen has one bond in a molecule then oxygen carries a negative charge and if oxygen has three bonds in molecule then oxygen carries a positive charge.

In the compound-I and Compound-IV the oxygen contains three bonds. Therefore option-d is correct.