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Q. No.

Identify more than one correct resonance structure of carbon dioxide from the ones given below:

a.  -O-C=O+

b.  O=C=O

c.  -O≡C-O+

d.  -O-C≡O+

Choose the correct option:

1. a and b 2. b and c
3. c and d 4. b and d

Subtopic:  Compounds of Carbon, Preparations, Properties & Uses |
Level 3: 35%-60%
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Given below are two statements: 

Assertion (A): Boric acid is considered a weak acid.
Reason (R): Boric acid is not able to release H+ ions on its own.

1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. (A) is false but (R) is true.
Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
Level 4: Below 35%
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The best reducing agent is

1. GeCl2

2. SnCl2

3. PbCl2

4. PbCl4

Subtopic:  Carbon Family - Preparations, Properties & Uses |
Level 3: 35%-60%
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Boric acid on heating at 150°C gives

1.  B2O3

2.  H2B4O7

3.  HBO2

4.  H2BO3

Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
Level 4: Below 35%
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The compound \(PbI_4\) does not exist because:

1. \(Pb^{2+}\) is more stable than \(Pb^{4+}\).
2. \(I^-\) is better reducing agent.
3. \(Pb^{4+}\) is more stable than \(Pb^{2+}\).
4. \(I^-\) is better oxidising agent.
Subtopic:  Properties of Glass, Pb & Sn compounds |
Level 3: 35%-60%
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Among the following statements, the correct set of statements are:
a. \(B_2H_6 \) is Lewis acid.
b. \(B_2H_6 \) has a planar structure.
c. All B-H Bond lengths are equal in \(B_2H_6 \).
d. In \(B_2H_6,\) four \(3C-2e^- \) bonds are present.
e. \(B_2H_6 \) can be prepared by the reaction of \(BF_3 \) and \(NaBH_4 \).
 
1. a, b, c, d, e 2. a, e
3. a, b 4. d, e
Subtopic:  Compounds of Boron- Preparations, Properties & Uses |
 52%
Level 3: 35%-60%
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Assertion (A): Silicones are hydrophobic in nature.
Reason (R): Si–O–Si linkages are moisture sensitive.
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:  Properties of Structure of SiO2 & Other Compounds |
Level 3: 35%-60%
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Assertion (A): In C60 fullerene 12, five-membered rings and 20, six-membered rings are present.
Reason (R): All the C–C distances are equal in C60 fullerene.
 
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. Both (A) and (R) are False.
Subtopic:   Structure & Properties of Allotropes of C |
Level 3: 35%-60%
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Consider the given two statements:
Assertion (A): Sn4+ ion is more stable than Sn+2.
Reason (R): The inert pair effect dominates down the groups.
Options:
1. Both (A) and (R) are True and (R) is the correct explanation of  (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Carbon Family - Preparations, Properties & Uses |
Level 3: 35%-60%
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Assertion (A): Melting point of gallium is lesser than aluminum.
Reason (R): Due to the inert pair effect, increased effective nuclear charge holds ns-electrons tightly. 
 
1. Both (A) and (R) are True and (R) is the correct explanation of (A).
2. Both (A) and (R) are True but (R) is not the correct explanation of (A).
3. (A) is True but (R) is False.
4. (A) is False but (R) is True.
Subtopic:  Boron Family- Preparations, Properties & Uses |
Level 3: 35%-60%
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