The addition of gypsum to Portland cement helps in :
1). increasing the strength of cement
2). rapid setting of cement
3). preventing rapid setting of cement
4). reduction in the cost of cement
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1. The chief constituent of natural gas is:
2. An example of replenishable energy source is–
3. Which of the following gases emitted from automobile exhaust is poisonous?
4. Which gas is used for converting vegetable oils into saturated fats ?
5. Which one of the following is commonly used for pulp bleaching in the paper industry?
6. The rusting of iron is a/an
7. Sodium Carbonate is commonly known as
8. Question 14.20:Why are vitamin A and vitamin C essential to us? Give their important sources.
9. In which of the following states maximum iron ore is found ?