Rock salt is a mineral containing
1). potassium
2). magnesium
3). sodium
4). iron
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1. White phosphorus is always kept under
2. Which of the following is the major constituent of LPG?
3. When Hydrogen starts burning in air it produces
4. Which of the following has pH value 7?
5. Question 7.4:Why does NH3 form hydrogen bond but PH3 does not?
6. The ore which is found in abundance in India is
7. Percentage of lead in lead pencils is
8. The coating of a thin layer of zinc on steel or iron objects is known as
9. Milk tastes sour when kept in the open for sometime due to the formation of .
10. Barium loses ____ electrons to achieve noble gas electron configuration.