When did Abdur Rehman al nasir assume the title of Ameer ul Mominin

Compulsory tax on the produce of agricultural lands is

Who was the first to die among Sahaba?

How many Surah are with name of Prophets?

Holy Quran revealed in how many years?

What was the original color of Hajr-e-Aswad

When did Treaty of Hudaybiyyah take place