In which pair of ions both the species contain S-S bond?

(a) S2O72-, S2O32-(b) S4O62-, S2O32-(c) S2O72-, S2O82-(d) S4O62-, S2O72-

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group 16,preparation and properties
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AlF3 is soluble in HF only in presence of KF. It is due to the formation of
(a) K3[AIF3H3]
(b) K3[AIF6]
(c) AlH3
(d) K[AIF3H]

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Hot concentrated sulphuric acid is a moderately strong oxidising agent. Which of the following reaction doe not show oxidising behaviour?

(a) Cu + 2H2SO4 CuSO4 + SO2 + 2H2O

(b) 3S + 2H2SO4 3SO2 + 2H2O

(c) C + 2H2SO4 CO2 + 2SO2 + 2H2O

(d) CaF2 + H2SO4 CaSO4 + 2HF

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group 16,preparation and properties
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Among the following, which one is a wrong statement?

(a) PH5 and BiCl5 do not exist
(b) ρp-dp bonds are present in SO2
(c) SeF4 and CH4 have same shape
(d) I3+ has bent geometry

Concept Questions :-

group 17 ,preparation and properties
group 15 ,preparation and properties
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When copper is heated with conc. HNO3 it produces
(a) Cu(NO3)2 and NO       (b)Cu(NO3)2,NO and NO2
(c)Cu(NO3)2 and N2O       (d) Cu(NO3)2 and NO2

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group 15 ,preparation and properties
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Match the compounds given in column I with the hybridisation and shape given in column II and mark the correct option.

Column I     Column II
A. XeF6        1. Distorted octahedral
B. XeO      2. Square planar
C. XeOF    3. Pyramidal
D. XeF4       4. Square pyramidal

Codes
A B C D
(a) 1 2 4 3
(b) 4 3 1 2
(c) 4 1 2 3
(d) 1 3 4 2

Concept Questions :-

group 18,perparation and properties
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Which is the correct statement for the given acids?
(a) Phosphinic acid is a monoprotic acid while phosphonic acid is a diprotic acid
(b) Phosphinic acid is a diprotic acid while phosphonic acid is a monoprotic acid
(c) Both are triprotic acids
(d) Both are diprotic acids

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group 15 ,preparation and properties
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The product obtained as a result of a reaction of nitrogen with CaC2 is:

(a) CaCN          (b) CaCN3

(c) Ca2CN        (d) CaCN2

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group 15 ,preparation and properties
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Nitrogen dioxide and sulphur dioxide have some properties in common. Which property is shown by one of these compounds. but not by the other?

(a) Forms acid-rain
(b) Is a reducing agent
(c) Is soluble in water
(d) ls used as a food-preservative

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group 15 ,preparation and properties
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Maximum bond angle at nitrogen is present in which of the following?

(a) NO2
(b) NO2-
(c) NO2+
(d) NO3-

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group 15 ,preparation and properties
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