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

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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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Which of the statements given below is incorrect?

(a) Cl2O7 is an anhydride of perchloric acid

(b) O3 molecule is bent

(c) ONF is isoelectronic with Anionic NO2

(d) OF2 is an oxide of fluorine

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group 17 ,preparation and properties
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The variation of the boiling point of the hydrogen halides is in the order HF > HI > HBr > HCl. What explains the higher boiling point of hydrogen fluoride?

(a) The electronegativity of fluorine is much higher than for other elements in the group

(b) There is strong hydrogen bonding between HF molecules

(c) The bond energy ol HF molecules is greater than in other hydrogen halides

(d) The effect of nuclear shielding is much reduced in fluorine which polarises the HF molecule

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group 17 ,preparation and properties
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Strong reducing behaviour of H3PO2 is due to
(a) presence of one-OH group and two P-H bonds
(b) high electron gain enthalpy of phosphorus
(c) high oxidation state of phosphorus
(d) presence of two-OH groups and one P-H bond

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group 15 ,preparation and properties
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Acidity of diprotic acids in aqueous solutions increases in the order:-

(a) H2S<H2Se<H2Te
(b) H2Se<H2S<H2Te
(c) H2Te<H2S<H2Se
(d) H2Se<H2Te<H2S

Concept Questions :-

group 15 ,preparation and properties
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