Aluminium oxide is ___ in nature.
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All isotopes of the same element have ____________
Sphalerite is an ore/mineral of
The gas evolved when sodium carbonate reacts with hydrochloric acid is
What is the name of the most ancient spiral galaxy that existed 11 billion years ago?
If an object is placed at the center of curvature of a concave mirror, then the image formed will be
Which country was, in October 2017, named the best country to visit in 2018, according to Lonely Planet 'Best in Travel 2018' list?
Green House Effect' means