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Q249) The brown ring test for NO2- and NO3- is due to the formation of complex ion having the formula.. [ KCET 2000]




SOLUTION

Brown ring test for NO2- and NO3- is due to the formation of [Fe(H2O)5NO]2+ ion
Answer: (c)


Q250) Which of the following is ionic in nature? [ KCET 1999]




SOLUTION

CuF2 electronegativity difference is highest thus ionic character more
Answer: (a)


Q251) Which of the following is not the characteristic of zinc? [ Haryana CEET 1999]



SOLUTION

Zinc is brittle at room temperature
Answer:(c)



Q252) Mercury stick to the surface of the glass when it comes in contact with ..[ EAMCET 1998]



SOLUTION

2hg + O3 → Hg2O + O2
mercurous dissolves in mercury and sticks to glass
Answer: (c)


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