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1.
are
are
2.
The formula of zinc phosphite is:
3.
The bonds present in 
are:
are:
4.
Uranium isotopes are usually separated by using compounds of the halogen:
5.
Which of the following halogen oxides is ionic?
6.
Which gas is used to improve the atmosphere of crowded places?
7.
Which of the following is responsible for depletion of the ozone layer in the upper strata of atmosphere?
8.
9.
10.
Ripening of fruits can be carried out in presence of