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The first part of the sentence is in past so “ are” must be replaced with “ were” and should not be confused with the second part as it tells the present situation.
Which of the following is the best sources for Vitamin D are –
Which of the following is NOT a d-block element?
How many carbon atoms are present in a molecule of glucose?
Radon, used in radiotherapy, belongs to which group on the periodic table?
_______is the purest form of Carbon found in Nature.
Hydrogen was discovered by?
Who proposed the plum pudding model of the atom?
Main source of Naphthalene
Manganite is an ore/mineral of
Which acid is responsible for the stinging sensation caused by the nettle plant?