Q. The depletion in Ozone layer is caused by ________ .
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Q. The depletion in Ozone layer is caused by ________ .
Q. Which of the following atom contains the least number of neutrons
Q. Which one of the following is also known as solution ?
Q. A pure substance can only be
Q. Which of the following is used to make light weight, but strong plastic ?
Q. The gas that causes suffocation and death when coal or coke is burnt in a closed room is
Q. Which among the given gases is the most toxic?
Q. In an atom the order of filling up of the orbitals is governed by
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