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QUESTIONS

Chemistry
The hydronium ion is

H2+
H+
HO -
H3O+

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Steam Boilers, Engines, Nozzles and Turbines
Fire tube boilers are those in which

Water passes through the tubes and flue gases around it
Tubes are laid vertically
Forced circulation takes place
Flue gases pass through tubes and water around it

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Chemistry
The most electropositive elements among the following is

Cs
K
Na
Ca

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Steam Boilers, Engines, Nozzles and Turbines
The increase in pressure

Lowers the boiling point of a liquid
Does not affects the boiling point of a liquid
Raises the boiling point of a liquid
Reduces its volume

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Chemistry
The method that cannot be used for removing permanent hardness of water is

adding caustic soda
boiling
adding sodium carbonate
distillation

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