When did urdu become the official language of Pakistan?

Urdu has long been the language of the Muslims of India. After Indenependence, in 1949 Urdu was declared national language. Then it was subsequently declared national language in the constitutions of 1956, 1962, and 1973.It must be noted that Urdu us not the official language.

According to all the three constitutions of 1956, 1962, 1973, English is the official language. Urdu is the national NOT official language.

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