A man has been arrested for allegedly murdering his wife by letting loose a cobra in her room after first failing with a viper, police said on Monday.    According to police in the southern state of Kerala, India, phone records showed Sooraj, 27, had been in contact with serpent handlers and had also watched snake videos on the internet.    Sooraj got hold of a highly venomous Russell’s viper in March and released it into her bedroom. The viper …