Which of the following is a natural dye ? 1). Crystal violet 2). Aniline blue 3). Alizarin 4). Phenolphthalein
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1. Which of the following is secondary air pollutant ?
2. Dry ice is
3. The element used for making solar cells is
4. An atom of an element has atomic number 17 and mass number36 The number of neutrons in its nucleus is
5. Cement is made hard with
6. Question 8.22:Consider the elements:Cs, Ne, I and F(a) Identify the element that exhibits only negative oxidation state.(b) Identify the element that exhibits only postive oxidation state.(c) Identify the element that exhibits both positive and negative oxidation states.(d) Identify the element...
7. White phosphorus is always kept under
8. Hydrogen is not found In atmosphere because
9. The ore of Aluminium is
10. One of the constituents of tear gas is
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