Borax is used as cleansing agent because on dissolving in water it gives ________________.

alkaline solution

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acidic solution

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bleaching solution

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colloidal solution

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Solution

The correct option is A alkaline solution
Borax is $N a_{2} B_{4} O_{7} .10 H_{2} O$ . It gives alkaline solution on dissolution in water as it is a salt of strong base and weak acid and because of this it acts as cleansing agent.
$N a_{2} B_{4} O_{7} + 7 H_{2} O \to 4 H_{3} B O_{3} + 2 N a O H$

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Borax is used as a cleansing agent because on dissolving in water it gives

One of the following salts will give an alkaline solution on dissolving in water. This is :

(a) $N a_{2} C O_{3}$

(b) $N a_{2} S O_{4}$

(d) $(N H_{4})_{2} S O_{4}$

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