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Q65) The type of hybrid orbitals used by ClO2- is .. [ IIT 1992]




SOLUTION

Total valence electron in ClO2- is 7+6+6+1=20
Now 20 ÷ 8 = 2(Q1 + 4(R2
R1 ÷ 2 = 4/2 = 2 (R2)
Total of Q1 and R2 = 2+2
Thus sp3
Answer: (a)


Q66) Which of the following elements is extracted commercially by the electrolysis of an aqueous solution of its compound?




SOLUTION

By electrolysis of NaCl solution Cl2 is produced
Answer: (a)


Q67) HI can be prepared by all the following methods except.. [ CBSE PMT 1994]



SOLUTION

H2SO4 is a strong oxidising agent, it will oxidise HI to iodine
2HI + H2SO4 → SO2 + I2 + 2H2O
Answer:(b)



Q68) The element which never acts as reducing agent in a chemical reaction is [ Bihar CEE 1995]



SOLUTION

Fluorine due to its highest electronegativity is strongest oxidising agent , hence can never acts as reducing agent
Answer: (c)


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