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Q65) The brown ring test for NO2- and NO3- is due to the formation of complex ion with a formula [ KCET 2000]




SOLUTION


Answer: (a)


Q66) The P-P-P bond angle in white phosphorus is [ MPCET 1991]




SOLUTION

Four atoms pf P4 white phosphorous molecule occupy corners of regular tetrahedron so P-P-P bond angle is 60°
Answer: (d)


Q67) The acid which forms two series of salt [ haryana CEET 1995]



SOLUTION

H3PO4 is dibasic and form two series of salts

Answer:(b)



Q68) Which one of following substance has highest proton affinity [ AIEEE 2003 ]



SOLUTION

NH3 has most easily available lone pair and hence shows great proton affinity
Answer: (c)


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