11) A
8. Pure phosphine is not combustible while impure phosphine is combustible, this combustibility is due to the presence of _______
A. P2H4
B. N2
C. PH5
D. P2O5
9. Hydrolysis of NCl3 indicates
A. N- --- Cl+ polatrity
B. N+ --- Cl- polatrity
C. N- --- Cl- polatrity
D. N+ --- Cl+ polatrity
10. Why NCl3 cannot be hydrolysed ??
11. Explain why SO2 is a more powerful reducing agent in an alkaline medium than in acidic medium ??
12. Give reactions to show AgNO3 is soluble in excess hypo.
13. Why fluorine brings about the highest coordination number of the elements ??
14. Sulphur melts to form a clear mobile liquid at 392 K but on further heating to 433K,it becomes viscous. Why ??
15. Give an example of oxidation of one halide by another halogen. Explain the feasibility of the reaction.
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8 Answers
1Q10 NCl3 cannot be hydrolysed because of the absence of vacant d orbitals
106Q15. HI + F2 --> HF + I2
this is feasible because F is at the bottom of the electrochemical series implying that it will always exist in the form of F-
The Eo for the reaction F2 --> 2F - is highly negative implying that the reaction is spontaneous in the forward direction
18 ) i think A)
9) its also A.
10) Why can't NCl3 cannot be hydrolysed ?? i think on hydrolysis NCl3 gives ammonia and Cl2O.
11) in acidic medium , SO2 is readily attacked by H+ and is reduced to SO2+.
12) dude , i don't think AgNO3 is soluble in excess hypo.rather i hd read abt AgBr is soluble in hypo.
AgNO3 + S2O32- → Ag2S2O3 (white) → Ag2S (black)
AgBr + S2O32- → [ Ag ( S2O3 )2 ]3- (soluble complex )
13) der r two reasons :
a) M - F bond is always very strong , M being any element ( except Xe ).
b) F atom is too small to create any hindrance around the molecule.
14) ALLOTROPIC CHANGE TAKES PLACE FROM RHOMBIC TO MONOCLINIC Sulphur. monoclinic S is stable at relatively higher temperature.
19 ------- A
8 -------- P2H4
10--------NCl3 cannot be hydrolysed since it doesnt have d vacant orbitals...
n plz read NCERT u will get all dese answers......very basic questions boldly mentioned in NCERT for class 12 PART 1
1@ 10 ) rohit , u forgot ' Cl ' hs d- orbitals , if not N. so,hydrolysis cn take place.
39Hydrolysis of NCl3 gives NH3 and Cl2O
whereas PCl3 gives H3PO3 and HCl.
