chemical bonding

Class 11 Chemistry Chapter Chemical Bonding Important MCQs for Exams

Class 11 Chemistry Chemical Bonding Important MCQs with Brief Answers for Exams:

Chemical Bonding Important MCQs for Exams ( Part 1)

1.Atoms form chemical bond to become:

1.Reactive

2.Conductive

3.Soluble

4.Stable

Click to Types of Chemical Bonds ( in Urdu / Hindi)

Answer )  Stable

Brief Explanation :

Atoms form chemical bond to complete their valence shells like inert gases and becomes stable .The inert gases are stable and non-reactive due to their complete valence shells .

All other known elements tend to complete their Valence shells by re-arrangement (transfer, sharing or donation) of electrons and become stable.


2. A covalent bond is formed by the            of electrons:

1.Complete transfer

2.Equal sharing

3.Unequal sharing

4.Both 2 & 3

Answer ) Both 2 & 3

Brief Explanation :

A covalent bond is formed by the equal (i.e. non-polar)  & unequal (i.e.  polar) sharing of electrons between atoms.

When electronegativity difference two bonded atoms is zero,  the bond is non-polar like H – H , Cl – Cl bonds.

When the E.N difference is 1.7, the bond is 50% covalent and 50% ionic .

If the E.N difference is less than 1.7, the bond is more than 50% covalent & less than 50% ionic like H-CL (3.0-2.1= 0.9) & H-OH (3.5-2.1=1.4) bonds.

Similarly , a bond is more than 50% ionic & less than 50% covalent when E.N difference is more than 1.7. For example , H-F (4-2.1= 1.9) bond.

The percent ionic character of bond b/w two atoms “A” & “B” having E.N of XA & XB respectively ,can be calculated by using the Hanny – Smyth equation i.e. 

 % Ionic character  = 16 (XA –XB) + 3.5 ( XA –XB)2

Types of Covalent Bonds ( in Urdu / Hind)

3. The strength of covalent bond depends on:

1.Nature of overlapping

2.Extent of overlapping

3.Geometry of molecule

4.Both 1 & 2

Answer ) Both 1 & 2

Brief Explanation :

The nature of the covalent bond depends upon the nature & the extent of overlapping of orbitals.

Head-on overlapping of orbitals produces strong sigma bond while sidewise overlapping produces weaker pi-bond .

Greater the extent of overlapping of orbitals , stronger is the resulting bond and vice versa.


4. Ionic bond is formed between metals and non-metals when the difference of E.N is:

1.Zero

2.1.7

3.2 or more

4.None of these

Answer ) 2 or more

Click to Watch Ionic Bond ( in Urdu / Hindi)

Brief Explanation :

When electronegativity difference b/w two bonded atoms is two or more , the bond is ionic .

For example ,   Na+ Cl( 3- 0.93= 2.04)   &

                             Ca+O (3.5-1.00= 2.5)bonds.


5. A bond which is formed by the unequal sharing of electrons:

1.Metallic

2.Polar covalent

3.Non-polar covalent

4.Co-ordinate covalent

Click to Watch Difference between Polar & Non-Polar bond ( in Urdu / Hindi)

Answer ) Polar covalent

Brief Explanation :

Polar covalent bond is formed when the atoms with different electronegativities shared electrons in covalent bond . The bonded electrons are unequal shared in a polar covalent bond.

Example of Polar Covalent Bond

6. The dots & crosses surrounding a symbol in the Lewis structure represents:

1.Bonding electrons

2.Non-Bonding electrons

3.Unpaired electrons

4.Valence electrons

Answer ) Valence electrons

Brief Explanation :

A Lewis structure consists of the symbols of an element, which is surrounded by dots and crosses . The symbol represents the nucleus and the normally filled inner shells of electrons while the dots or crosses represents the valence electrons . The non-bonding electrons are usually given in pairs.


7. VSEPR theory explains which properties of covalent molecules:

1.Geometrical shapes

2.Sharing of electrons

3.Magnetic properties

4.Type of hybridization

Answer ) Geometrical shapes

Brief Explanation :

Linear Shape

VSEPR theory explains the geometry of a covalent molecule in terms of bond angles.

The geometry of a covalent molecule depends upon the number and nature of electron –pair around the central atom.

The electron pair tend to remain at maximum angles from each other to minimize the  repulsion and get stability.

Tetrahedral shape
Trigonal Planar

8. The decreasing order of repulsion among electron-pair is:

1.Bond pair-Bond pair > Lone pair-Bond pair > Lone pair-Lone pair

2.Bond pair-Bond pair >Lone pair-Lone pair > Lone pair-Bond pair

3.Lone pair-Lone pair> Bond pair-Bond pair >  Lone pair-Bond pair

4.Lone pair-Lone pair > Lone pair-Bond pair > Bond pair-Bond pair

Click to Lone pair & Bond pair Electrons ( in Urdu / Hindi)

Answer ) Lone pair-Lone pair > Lone pair-Bond pair > Bond pair-Bond pair

Brief Explanation :

The lone pair of electron is attracted by only one nucleus , so it spreads out, occupies more space & exerts greater repulsion  than the bond-pair of electrons which is attracted by two nuclei. The Lone-pair push closer the bond pair  together & decrease the angles b/w them.

 The decreasing order of repulsion = Lone pair-Lone pair > Lone pair-Bond pair > Bond pair-Bond pair

Bond pair ( Shared electron pair ) & Lone pair (Unshared electron pair)

molecule with only three bond-pair electrons

9. A molecule with only three bond-pair electrons around the central atom is:

1. Tetrahedral

2. Pyramidal

3. Trigonal Planar

4. Linear

Answer ) Trigonal Planar

Brief Explanation :

Generally, the molecules with only two , three, or four bond pairs of electrons around  the central atom have regular geometrical shapes.

For example, molecules with two , three, or four bond pairs of electrons have linear (BeCl2) , Trigonal planar (BF3 ) or tetrahedral (CH4) shapes respectively .

The molecules ( NH3 , H2O ) with both bond-pair and lone-pair have distorted/ irregular shapes. It is due to greater repulsion of lone-pair that compresses together the bond-pair.

BF3 :Example of molecule with three bond pairs of electrons around  the central atom

10. VSEPR theory fails to explain :

1.Shapes of high polar molecules

2.Shapes of transition metal complexes

3.Formation of covalent bond

4.All of these

Answer ) All of these

Brief Explanation :

VSEPR theory can’t explain how & why electrons share to form covalent bond although they repel each other . It also can’t explain shapes of transition metal complexes & shapes of molecules with highly polar bonds. For example m LiO2 should have water-like angular shape but it has linear shape.

Chemical Bonding Important MCQs for Exams ( Part 2)
Pages: 1 2

43 replies »

  1. I blog frequently and I really appreciate your information. Your article has really peaked my interest. I am going to book mark your website and keep checking for new details about once per week. I subscribed to your Feed as well.

    Liked by 1 person

  2. Can I just say what a relief to discover an individual who genuinely knows what they are discussing on the internet.
    You certainly realize how to bring a problem to light and make it important.
    More and more people need to look at this and understand this side of the story.
    I was surprised that you are not more popular because you definitely possess
    the gift.

    Also visit my web blog: Green Flame CBD Gummies

    Like

  3. I don’t even know how I ended up here, but I thought this post was good.
    I don’t know who you are but definitely you’re going to a famous blogger if you aren’t
    already 😉 Cheers!

    Like

  4. An interesting discussion is definitely worth comment. I do believe that you should write more on this subject matter,
    it might not be a taboo subject but usually people don’t talk
    about these subjects. To the next! Kind regards!!

    Like

  5. Hi, i think that i saw you visited my site thus i came to “return the
    favor”.I am attempting to find things to improve my site!I suppose its ok to use some of your ideas!!

    Like

  6. I blog frequently and I truly appreciate your information. This great article has really
    peaked my interest. I’m going to bookmark your
    site and keep checking for new details about once a week.
    I subscribed to your RSS feed as well.

    Like

  7. Hey I know this is off topic but I was wondering if you knew of any widgets I could add to my blog that automatically tweet my newest twitter updates.
    I’ve been looking for a plug-in like this for quite some time and was hoping maybe you would have
    some experience with something like this. Please let me know if you run into anything.
    I truly enjoy reading your blog and I look forward
    to your new updates.

    Like

  8. Hello my family member! I wish to say that this article is awesome, great written and come with almost all significant infos.
    I’d like to see more posts like this .

    Like

  9. This is really interesting, You’re a very skilled blogger.
    I have joined your rss feed and look forward to seeking
    more of your great post. Also, I’ve shared your website in my social networks!

    Like

  10. Good day! Do you use Twitter? I’d like to follow you if that would be okay.
    I’m definitely enjoying your blog and look forward to new posts.

    Like

  11. Just want to say your article is as astounding. The clarity for your put up
    is just great and i can think you are a professional on this subject.
    Well together with your permission let me to snatch your RSS feed to keep up to date
    with imminent post. Thanks 1,000,000 and please keep up the rewarding work.

    My web page – Markus

    Like

  12. Good day! I could have sworn I’ve visited your blog before but after
    looking at some of the articles I realized it’s new to me.

    Nonetheless, I’m definitely pleased I discovered it
    and I’ll be bookmarking it and checking back frequently!

    Like

  13. I wanted to thank you once more for this amazing site you have designed here.
    Its full of useful tips for those who are definitely interested in this subject, especially this very post.
    Your all so sweet and also thoughtful of others in addition to the fact that reading your site
    posts is a superb delight in my opinion. And thats a generous gift!
    Jeff and I are going to have excitement making use of your
    tips in what we should do in the future. Our collection of ideas is a kilometer
    long and tips is going to be put to excellent use.

    Check out my web-site :: Glacier Air Conditioner Reviews (http://www.fotosombra.com.br)

    Like

  14. Admiring the persistence you put into your site and in depth information you offer.
    It’s great to come across a blog every once in a while that isn’t the
    same out of date rehashed material. Excellent read!
    I’ve bookmarked your site and I’m adding your RSS feeds to my Google account.

    Like

  15. Its like you read my mind! You seem to know so much about this, like you wrote the book in it or something.
    I think that you could do with a few pics to drive the
    message home a bit, but instead of that, this is fantastic
    blog. An excellent read. I will definitely be back.

    Like

  16. I ɑm nno ⅼonger certain where you aree getgting your info, however
    good topiс. I needs to spend solme time studying much more or figuring оut mⲟre.
    Thank you for excellent info I used to Ƅe searching for this
    information foor my mission.

    Like

  17. Do you mind if I quote a few of your posts as
    long as I provide credit and sources back to your webpage?
    My blog site is in the exact same area of interest as yours
    and my users would definitely benefit from a
    lot of the information you provide here. Please let me
    know if this okay with you. Regards!

    Feel free to surf to my web site: Compoise CBD Gummies

    Liked by 1 person

  18. We are a group of volunteers and starting a new scheme in our community.

    Your website offered us with valuable information to work on. You’ve done a formidable job and our whole
    community will be thankful to you.

    Liked by 1 person

  19. Hey! This is my 1st comment here so I just wanted to give a
    quick shout out and tell you I genuinely enjoy reading your blog posts.
    Can you suggest any other blogs/websites/forums that
    deal with the same topics? Appreciate it!

    Liked by 1 person

  20. I’m now not сertain the place you are getting your info, but great topic.

    I must spend a while ⅼearning more oor working out more.
    Thank you for fazntаstic information I used to be оn the lookоut for this information for my mission.

    Liked by 1 person

  21. This design is steller! You most certainly know how to
    keep a reader amused. Between your wit and your videos, I was almost moved to start my own blog (well, almost…HaHa!) Great job.
    I really loved what you had to say, and more than that, how you presented it.

    Too cool!

    My page; WifiLift Cost

    Liked by 1 person

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s