Multiple choice Kelsen’s theory of law is called pure theory of law because Kelsen purely discussed jurisprudence only defined law in accordance with morality and purity separated law from religion, ethics, sociology and history discussed law purely in terms of justice Reveal answer Fill a bubble to check yourself B Correct answer Explanation Kelsen’s theory of law is called pure theory of law because Kelsen defined law in accordance with morality and purity. Kelsen's strict separation of law and morals was an integral part of his presentation of the pure theory of law.