Verify that mod(a+b)<=mod(a)+mod(b), for a=2/5 and b=-3/7

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Sodium carbonate (Na2CO3): It is commercially available as washing soda and is used for washing purposes. It is also used in the preparation of glass and soap.

Sodium hydrogen carbonate or sodium bicarbonate (NaHCO3): It is commercially available as baking powder and is used in the baking food item like bread and bun. It is also used as an antacid which neutralizes the excessive acid in the stomach along with magnesium and aluminium hydroxide.

Sodium chloride (NaCl): It is the common salt and it is the main ingredient of food. Common salt is used in the preservation of food like to pack fish and meat during storage.

Ammonium chloride (NH4Cl): It is used in dry cell as an electrolyte.

Potassium nitrate (KNO3): It is used in the manufacture of glass and fertilizers. It is also the main constituent of gun powder.

Calcium carbonate (CaCO3): It is largely present in marbles. It is used in the preparation of glass and cement and also used in the extraction of iron from its ore in the form of slag (calcium silicate).

Copper sulphate (CuSO4): It is also known as "blue vitriol" and "blue stone". It is used in the copper voltmeter and in electroplating. It is used in the manufacture of insecticides and in calico printing.

Potash alum [K2SO4.Al2(SO4)3.24 H2O]: It is a double salt and is known as potassium aluminium sulphate. It is commonly used in the purification of water and in various industries like paper industry, dying industry, leather industry etc. It stops bleeding when applied on wound.

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