ranjith shahi

7/27/2019 ranjith shahi

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R a n j e e t S h a h i C h e m i s t r y C l a s s e sR a n j e e t S h a h i C h e m i s t r y C l a s s e sR a n j e e t S h a h i C h e m i s t r y C l a s s e sR a n j e e t S h a h i C h e m i s t r y C l a s s e s S C O 4 8 , I I n d F l o o r , S e c t o r 2 0 C , C H A N D I G A R H P h : 2 7 2 5 7 4 8 , 3 0 4 0 6 6 0

S C F 7 2 , S e c t o r 1 0 , P a n c h k u l a , P h : 3 9 1 4 8 4 4

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Copyright Ranjeet Shahi

IITIITIITIIT----JEEJEEJEEJEEReview Questions

Nitrogen, Phosphorus and their compounds

Level-2(Following Questions have more than one correct response)

Q1. Which of the following pairs of nitrates gives the same gaseous products on thermal decomposition?(A) KNO3and Pb(NO3)2 (B) KNO3and NaNO3(C) Pb(NO3)2and Cu(NO3)2 (D) NaNO3and Ca(NO3)2

B

C

Q2. 2NO2N2O4. The dimerisation of NO2is accompanied with(A) decrease in paramagnetism (B) change in colour

(C) increase in temperature (D) increase in paramagnetism

A

B

Q3. Al2(SO4)3+ NH4OHX, then(A) X is a white coloured compound (B) X is insoluble in excess of NH4OH

(C) X is soluble in NaOH (D) X cannot be used as an antacid

AB

C

Q4. The hybrid states of phosphorous atoms in each PCl5and PBr3in gaseous phase are sp3d. But, in solid PCl5, phosphorousshows sp

3d

2and sp

3hybrid states. While, P in PBr5is in sp

3hybrid state. This is because

(A) PCl5in solid form exists as [ PCl4]+[PCl6]

(B) PBr5in solid form exists as [PCl4]+[ PBr6]

(C) PCl5in solid form exists as [PCl4]+Cl

(D) PBr5in solid form exists as [PBr4]

+Br

A

D

Q5. Phosphine is obtained by the reaction when:(A) white phosphorus is heated with NaOH (B) Ca3P2reacts with water(C) red phosphorus is heated with NaOH (D) phosphorus is heated in a current of hydrogen.

A

B

Q6. At high temperatures, nitrogen directly combines with:(A) Zn (B) Mg (C) Al (D) Fe

BC

Q7. The compounds obtained by heating of orthophosphoric acid are:(A) metaphosphoric acid (B) pyrophosphoric acid (C) P4O6 (D) P4O10

AB

D

Q8. Which are used as refrigerant?(A) NH3 (B) CO2 (C) CCl2F2 (D) CO

A

B

C

Q9. Which of the following compounds is(are) explosive(s)?(A) NF3 (B) NCl3 (C) NBr3NH3 (D) NI3NH3

BC

D

Q10. If M represents Group 15 element, the correct order of HMH bond angle is(A) NH3< PH3< AsH3< SbH3 (B) SbH3< AsH3< PH3< NH3(C) NH3< PH3< SbH3< BiH3 (D) BiH3< SbH3< AsH3< PH3

B

D

Q11. Which of the following is true for N2O?(A) Its molecule is linear.

(B) Symmetric NON is a favoured structure as compared to NNO skeleton.

(C) Bond orders are fractional for NN and NO bonds.

(D) It is a neutral oxide.

A

C

D

Q12. Which of the following is true for N2O5?(A) It is obtained by carefully dehydrating HNO3with P2O5 (B) It is acidic oxide

(C) No NN bond exists in N2O5(g) (D) It is ionic in solid state as NO2+NO3

A

B

C

D

Group-15


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Q13. Which of the following species is (are) formed when conc. HNO3 is added to conc. sulphuric acid.(A) NO3

(B) NO2+ (C) NO+ (D) HSO4

B

D

Q14. Which of the following will give N2when heated?(A) NaN3 (B) NH4NO2 (C) NH4NO3 (D) Mg3N2

A

B

Q15. Which of the following precipitates dissolve in aqueous ammonia leaving no solid residue?(A) Cu(OH)2 (B) Ag2SO4 (C) Ni(OH)2 (D) Hg2Cl2

AB

C

Q16. PH3can be obtained by(A) heating hypophosphorus acid (B) heating orthophophorus acid

(C) reacting white phosphorus with hot conc. NaOH (D) hydrolysis of calcium phosphide

A

B

C

D

Q17. Drops of nitric acid reacts with P4O10to give(A) NO (B) NO2 (C) N2O5 (D) HPO3

C

D

Q18. Nitrating mixture is obtained by mixing conc. HNO3and conc. H2SO4. Role of H2SO4in nitration is(A) to force HNO3to behave as a base (B) to suppress the dissociation of HNO3

(C) to produce NO2+ions (D) to remove the color of NO2produced during nitration

A

C

Q19. Which of the following, when dissolved in water, will liberate ammonia?(A) NaNO3 (B) NaNO2 (C) NaNH2 (D) Na3N

C

D

Q20. As, Sb and Bi shown little or no tendency to form negative ions of the type M -. This is because(a) these elements are less electronegative (b) Their atoms have large size

(c) They are unable to hold the added electrons due to inert pair effect (d) They do not posses half filled np subshells

A

B

Q21. Which of the following statements is (are) correct?(a) The hydrides of group 15 elements act as oxidizing agent

(b) The hydrides of group 15 elements act as reducing agent

(c) The oxidizing power increases in going from NH3to BiH3

(d) The reducing power increases in going from NH3to BiH3

B

D

Q22. Which of the following statement is (are) correct?(a) Antimony on reaction with conc. HNO3gives antimonic acid.

(b) Manganese on reaction with conc.HNO3gives NO2gas

(c) HNO2disproportionate to give HNO3and NO

(d) HNO3on reaction with P4O10gives N2O5

A

CD

Q23. Which of the following statement is (are) correct?(a) SbH3> NH3> AsH3> PH3(boiling point)

(b) H3PO4> H3PO3> H3PO2(reducing character)

(c) N2O < NO < N2O3< N2O5(oxidation state on nitrogen atom)

(d) NH3> PH3> AsH3> SbH3BiH3(Basicities)

AC

D

Q24. Which of the following statements are true for ammonia?(a) reduction of NO3

-by zinc dust and NaOH forms NH3

(b) ammonia reacts with excess of Cl2and forms nitrogen

(c) hydrolysis of A/N forms NH3

(d) ammonia is sparingly soluble in water

A

C


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Q25. White phosphorus (P4) has (a) six P-P single bonds (b) four P-P single bonds

(c) four lone pairs of electrons (d) PPP angle of 60

A

B

C

Q26. HNO3is treated with ferrous salt then the final product is (a) NO2 (b) Fe3+ (c) Fe2O4 (d) None of these

AB

Assertion Reason Types

Questions given below consist of two statements each printed as Assertion (A) and Reason (R); while answering these

questions you are required to choose any one of the following four responses:(A) if both (A) and (R) are true and (R) is the correct explanation of (A)

(B) if both (A) and (R) are true but (R) is not correct explanation of (A)

(C) if (A) is true but (R) is false

(D) if (A) is false and (R) is true

Q27. Assertion: Ammonium nitrite on heating gives N2O.Reason: N2O is a neutral oxide.

D

Q28. Assertion: H3PO3is a dibasic acid and shows reducing character.Reason: H3PO3contains two OH

groups and one hydrogen atom directly attached to P atom.

A

Q29. Assertion: Liquid NH3is used for refrigerationReason: Enthalpy of vaporization of ammonia is very large.

A

Q30. Assertion: PCl5is covalent in gaseous and liquid state but ionic in solid state.Reason: PCl5in solid state consists of tetrahedral PCl4

+cation and octahedral PCl6

anion.

B

Q31. Assertion: Among nitrogen halides NX3, the dipole moment is highest for NI3and lowest for NF3.Reason: Nitrogen halides NX3 , have trigonal pyramidal structure.

B

Q32.Assertion: NO3

is planar while NH3is pyramidal.

Reason: N in NO3

is sp2hybridised but in NH3it is sp

3 hybridized.

A

Q33. Assertion: NaH2PO2is the acid salt.Reason: It contains no ionizable protons.

D

Q34. Assertion: Both H3PO3 and H3PO4have the same number of hydrogen atoms but H3PO4 is a tribasic acid and H3PO3 isa diabasic acid.

Reason: 1 mol of H3PO3is neutralized by 2 mol of NaOH while 1 mol of H3PO4is neutralized by 3 mol of NaOH.

B

Passage

The following flow diagram represents the industrial preparation of nitric acid from ammonia:

NH3 O2

(A)

(excess of air)

NO(B)

air(C) water HNO3 NO+ 900oC +

Answer the questions given below:

Q35. Which line of entry describes the undefined reagents, products and reaction conditions?A B C A B C

(A) catalyst R.T. (25C) NO2 (B) catalyst R.T. (25C) N2O

(C) catalyst high pressure NO2 (D) high pressure catalyst N2O3

A


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Q36. Formation of HNO3when (C) is dissolved in H2O takes place through various reactions. Select the reaction not observed inthis step.

(A) NO2+ H2OHNO3+ HNO2 (B) HNO2H2O + NO + NO2

(C) NO2+ H2OHNO3+ NO (D) none of these

D

Matching Type Questions

Q37. Column I Column II(a) Acid hydride of nitrogen (i) [Fe(H2O)5NO]

(b) Nitrolim (ii) Dinitrogen trioxide

(c) Brown ring (iii) Calcium cyanamide and carbon.

(d) Deep blue liquid (iv) Hydrazoic acid

Q38. Column I Column II(a) PCl5

Moist

Air (p) Hydrolysis

(b) P4+ NaOH (conc.)+ H2O2

CO

(q) At least one of the products has tetrahedral hybridisation

(c) H3PO3

(r) Disproportionation.(d) P2O3+ H2O

(s) At least one of the products has p- dbonding.

Answers1. B C 16. A B C D 31. B 46.2. A B 17. C D 32. A 47.3. A B C 18. A C 33. D 48.4. A D 19. C D 34. B 49.5. A B 20. A B 35. A 50.6. B C 21. B D 36. D7. A B D 22. A C D 37. (a = iv, b = iii, c = i, d = ii)8. A B C 23. A C D 38. (A:PQS), (B:QRS)9. B C D 24. A C (C:S), (D:PQRS)10. B D 25. A B C11. A C D 26. A B12. A B C D 27. D13. B D 28. A14. A B 29. A15. A B C 30. B

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