Give the full form of (a) EDI, (b) PoS, (c) STD, (d) ISD, (e) VSNL, (f) UPC, (g) BSNL.

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Solution

(a) Electronic Data Interchange

(b) Point of Sales

(c) Subscriber Trunk Dialing

(d) International Subscriber Dialing

(e) Videsh Sanchar Nigam Limited

(f) Under Postal Certificate

(g) Bharat Sanchar Nigam Limited

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The flocculation values of $K C l$ , $M g C l_{2}$ , $C r C l_{3}$ and $S n C l_{4}$ for a negatively charged sol are in the order:

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$A + 2 N H_{4} C l \to B$

A and B ?

_{2}

_{2}

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Valency of tin in $S n C l_{2}$ and $S n C l_{4}$ is _______ and _______ respectively.

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CO is isoelectronic with

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