Duration: 5:35

5 views

0

Select the true statements:
(i) The formula of the corundum is \( \mathrm{Al}_{2} \mathrm{O}_{3} \).
(ii) The formula of cryolite is \( \mathrm{Na}_{3} \mathrm{AlF}_{6} \).
(iii) The formula of borax is \( \mathrm{Na}_{2} \mathrm{~B}_{4} \mathrm{O}_{7} \cdot 10 \mathrm{H}_{2} \mathrm{O} \).
(iv) The formula of bauxite is \( \mathrm{Al}_{2} \mathrm{O}_{3} \cdot \mathrm{H}_{2} \mathrm{O} \).
(A) (i), (ii) and (iii)
(B) (ii), (iii) and (iv)
(C) (i), (ii) and (iv)
(D) (iii) and (iv)
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live