Therefore, the given statement is false.
(b)
Neutron is not formed by an electron and a proton combining together. Neutron is an independent sub-atomic particle like electron and proton.
Therefore, the given statement is false.
(c)Therefore, the given statement is true.
(d)
Tincture iodine is an antiseptic that usually contains 2–7% elemental I-127 dissolved in a mixture of ethanol and water.
Therefore, the given statement is true.