Which of the following ions forms the most stable complex compound?

Which amino acids are present in histones?

Which of the following radioisotopes is used as anticancerous?

The number of octahedral and tetrahedral holes respectively present in a hexagonal close packed $(hcp)$ crystal of '$X$' atoms are

The amphoteric hydroxide is

An atomic power nuclear reactor can deliver $300\, MW$. The energy released due to fission of each nucleus of a uranium atom ${U^{238}}$ is $170\, MeV$. The number of uranium atoms fissioned per hour will be