Related Questions

In a certain laboratory, chemicals are identified by a colour-coding system. There are 20 different chemicals. Each one is coded with either a single colour or a unique two-colour pair. If the order of colours in the pairs does not matter, what is the minimum number of different colours needed to code all 20 chemicals with either a single colour or a unique pair of colours?
For the same long diagonal length of indenter of Vickers hardness and Knoop hardness, the Knoop hardness is how much percentage of the Vickers indenter?
Softening chemicals, lime and soda do not depend on ____________
The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.
Which of the following statement(s) is/are correct?
1. If sodium carbonate and washing soda is mixed in water the hardness of water can be removed.
2. The reaction of the chemicals produce sodium sulphate, sodium carbonate and insoluble calcium carbonate.
3. Magnesium sulphate chloride and magnesium carbonate is also produced.
Select the correct answer
Which of the following process does not remove the permanent hardness of water?
Reverse osmosis is used to recover chemicals from the textile industry. Which of the following is NOT one of these chemicals?
Consider the following chemicals.
1. Benzene
2. Carbon tetrachloride
3. Sodium carbonate
4. Trichloroethylene
Which of the above is/are used as dry cleaning chemicals?
The purpose of the recovery boiler is to recover the inorganic chemicals as smelt, burn the organic chemicals so they are not discharge from the mill as pollutants, and recover the heat of combustion in the form of heat.
The hardness of 1000 litres of a water sample was removed by passing it through a zeolite softener which required 30litres of NaCl solution containing 1.5 gm/L NaCl for regeneration. The hardness of the water sample will be ___________