Question

please solve the equations
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Answer 1

Answer:

chemical formula by interchanging valencies

Answer 2

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Question:

____________

Write the formula of the following compounds :-

(i) Sodium Phosphate

(ii) Ammonium Sulphate

(iii) Calcium Hydroxide

(iv) Lead Bromide

Answer:

__________

(i) Sodium Phosphate

= Na Po4 ........ Write down the symbols

= Na +¹ Po4 -³ ........ Write the Charges

= Na3Po4 ....... Interchange charges & write as

subscript

(ii) Ammonium Sulphate

= NH4 So4 ........... Proceed as in (i)

= NH4 +¹ So4 -²

= (NH4)2So4

(iii) Calcium Hydroxide

= Ca OH ...... Proceed as in (i)

= Ca +² OH -¹

= Ca(OH)2

(iv) Lead Bromide

= Pb Br ..... Proceed as in (i)

= Pb +² Br -¹

= PbBr2

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