Which of the following are the forms of calcium carbonate?
1. Marble
2. Chalk
3. Limestone
Select the answer using the code given below:
1, 2 and 3
Marble, chalk, and limestone are all naturally occurring forms of calcium carbonate (CaCO3), differing mainly in their degree of crystallinity, purity, and geological formation process.
Which one of the following is used in soda-acid fire extinguishers?
Which one of the following gases is released mostly from landfills in urban areas?
Consider the following statements :
1. The temporary hardness in water is due to the presence of bicarbonates of calcium.
2. The permanent hardness in water is due to the presence of soluble chlorides and sulphates of calcium and magnesium.
3. The permanent hardness in water is removed by adding \(Na_2CO_3\) to water.
Which of the statements given above are correct ?
After a hot sunny day, people sprinkle water on the roof-top because:
Methyl Isocyanate gas, which was involved in the disaster in Bhopal in December 1984, was used in the Union Carbide factory for the production of:
‘German silver’ is used to make decorative articles, coinage metal, ornaments, etc. The name is given because:
Which one of the following sodium compounds is used for softening hard water?
Which of the following is a greenhouse gas?
I. Methane
II. Nitrous oxide
The gas which turns lime water milky is:
Liquefied Petroleum Gas (LPG) is mainly a mixture of:
Among the following, the conducting form of carbon is
Which of the following is NOT a Fossil Fuel?