In the light of the below statements, choose the correct answer from the options given below.
I: Acid strength increases in the order given as HF < HCl < HBr < HI.
II: As the size of the elements F, Cl, Br, I increases down the group, the bond strength of HF, HCI, HBr, and HI decreases and so the acid strength increases.

1. I is correct but II is false.
2. I is incorrect but II is true.
3. Both I and II are true.
4. Both I and II are false.

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Which of the following is incorrect regarding noble gases?

1. Noble gases have weak dispersion forces.
2. Noble gases have large positive values of electron gain enthalpy.
3. Noble gases are sparingly soluble in water.
4. Noble gases have very high melting and boiling points.

Subtopic:  Group 18 - Preparation, Properties & Uses |
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In which one of the following arrangements the given sequence is not strictly according to the properties indicated against it?

1. NH< PH< AsH< SbH3 Increasing acidic character
2. CO< SiO< SnO< PbO2 Increasing oxidizing power
3. HF < HCl < HBr < HI Increasing acidic strength
4. H2O < H2S < H2Se < H2Te Increasing pKa values
Subtopic:  Group 15 - Preparation, Properties & Uses |
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Which of the following compound of sulphur has -O-Olinkage?

1. H2SO4, sulphuric acid

2. H2S2O8, peroxodisulphuric acid

3. H2S2O7, pyrosulphuric acid

4. H2SO3, sulphurous acid

Subtopic:  Group 16 - Preparation, Properties & Uses |
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Match the compounds of Xe in column I with the molecular structure in column II.

Column-I Column-II
(a) XeF2 (i) Square planar
(b) XeF4 (ii) Linear
(c) XeO3 (iii) Square pyramidal
(d) XeOF4 (iv) Pyramidal
 
(a) (b) (c) (d)
1. (ii) (i) (iii) (iv)
2. (ii) (iv) (iii) (i)
3. (ii) (iii) (i) (iv)
4. (ii) (i) (iv) (iii)
Subtopic:  Group 18 - Preparation, Properties & Uses |
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Which one of the following reactions does not come under hydrolysis type reaction?

(1) SiCl4(l)+2H2O(l)SiO2(s)+4HCl(aq)

(2) Li3N(s)+2H2O(l)NH3(g)+3LiOH(aq)

(3) 2F2(g)+2H2O(l)4HF(aq)+O2(g)

(4) P4O10(s)+6H2O(l)4H3PO4(aq)

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Which is the correct thermal stability order for H2EE=O, S, Se, Te and Po?

1.  H2Se<H2Te<H2Po<H2O<H2S

2.  H2S<H2O<H2Se<H2Te<H2Po

3.  H2O<H2S<H2Se<H2Te<H2Po

4.  H2Po<H2Te<H2Se<H2S<H2O

Subtopic:  Group 16 - Preparation, Properties & Uses |
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Match the Xenon compounds in ColoumnI with its structure in Column-II and assign the correct code:

Column I Column II
(a)  XeF4 (i) pyramidal
(b) XeF6 (ii) square planar
(c) XeOF4 (iii) distorted octahedral
(d)  XeO3 (iv) square pyramidal

Code:

(a) (b) (c) (d)
1. (iii) (iv) (i) (ii)
2. (i) (ii) (iii) (iv)
3. (ii) (iii) (iv) (i)
4. (ii) (iii) (i) (iv)
Subtopic:  Group 18 - Preparation, Properties & Uses |
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Match the following:

(a) Pure nitrogen (i) Chlorine
(b) Haber process (ii) Sulphuric acid
(c) Contact process (iii) Ammonia
(d) Deacon's process (iv) Sodium azide or Barium azide
 
(a) (b) (c) (d)
1. (iv) (iii) (ii) (i)
2. (i) (ii) (iii) (iv)
3. (ii) (iv) (i) (iii)
4. (iii) (iv) (ii) (i)
Subtopic:  Group 15 - Preparation, Properties & Uses |
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Which of the following statements about PCl5 is false? 

1. PCl5 molecule is non-reactive
2. Three equatorial P-Cl bonds make an angle of 120° with each other
3. Two axial  P-Cl bonds make an angle of 180° with each other
4. Axial P-Cl bonds are longer than equatorial P-Cl bonds

Subtopic:  Group 15 - Preparation, Properties & Uses |
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