Q21 of 75 Page 81

Write the chemical formulae of Nitrates (NO3–) of Na+, K+, Al3+, Mg2+, Ca2+, Zn2+.

(i) For Na+


By applying criss-cross method:



Formula: NaNO3


(ii) For K+


By applying criss-cross method:



Formula: KNO3


(iii) For Al3+


By applying criss-cross method:



Formula: Al(NO3)3


(iv) For Mg2+


By applying criss-cross method:



Formula: Mg(NO3)2


(v) For Ca2+


By applying criss-cross method:



Formula: Ca(NO3)2


(vi) For Zn2+


By applying criss-cross method:



Formula: Zn(NO3)2


More from this chapter

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19

How are given mass, molar mass and number of moles related to each other?

 20

The symbols of some of the ions are given below

Na+, Mg2+, H+, Cl–, S2–


Using this information, find out the formulae of


(i) sodium carbonate


(ii) magnesium chloride


(iii) hydrogen sulphide

 22

Write the chemical formulae and names of the compounds formed by the following ions:

(i) Cr3+ and SO42–


(ii) Pb2+ and NO3–


(iii) Mg2+ and CO32–

 23

In a chemical compound calcium sulphate:

(i) Identify the two ions.


(ii) Write the chemical formula of compound formed when positive ion is replaced by sodium ion.


(iii) Name the resulting compound.