List of top Geology Questions on Geochemistry asked in IIT JAM GG

The weight loss during the conversion of 1 mole of gypsum to anhydrite is ________. (Atomic weights: Ca = 40.0, S = 32.0, O = 16.0, H = 1.0) (Round off to two decimal places.)
The second-most abundant oxide in the Earth's crust is
When a dunite comprising pure forsterite undergoes melting, the weight % of MgO in the melt is ........ (answer in one decimal place). Given molecular weights of \( \text{SiO}_2 = 60.08 \), \( \text{MgO} = 40.30 \).
A diamondiferous lamproite is ultrapotassic and has a molar \( \text{K}_2\text{O}/\text{Na}_2\text{O} \) ratio of 11. If the \( \text{Na}_2\text{O} \) content of the rock is 0.62 wt%, the \( \text{K}_2\text{O} \) content is .......... wt% (answer in one decimal place; molecular weight of \( \text{Na}_2\text{O} = 61.98 \), and \( \text{K}_2\text{O} = 94.20 \)).