Which of the following elements never show positive oxidation number?
O
Fe
Ga
F
Which of the following element is a metalloid?
Bi
Sn
Ge
C
What is the name of element with atomic number 105?
Kurchatovium
Dubnium
Nobelium
Holmium
Which among the following elements have lowest value of IE1?
Pb
Si
KI and CusO4 solution when mixed, give :
CuI2 + K2SO4
Cu2I2 + K2SO4
K2SO4 + Cu2I2 + I2
K2SO4 + CuI2 + I2