Which of the following reaction(s) are not relevant to the microcosmic salt bead test?
I. $C r_{2} O_{3} + 3 B_{2} O_{3} ⟶ 2 C r {(B O_{2})}_{3}$
II. $C o O + Z n O ⟶ C o Z n O_{2}$
III. $C o O + N a P O_{3} ⟶ N a C o P O_{4}$
IV. $A l_{2} {(S O_{4})}_{3} + 3 N a_{2} C O_{3} ⟶ A l_{2} O_{3} + 3 N a_{2} S O_{4} + 3 C O_{2}$

I, III, and IV

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I, II, and IV

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II, III, and IV

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II and IV only

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Solution

The correct option is B I, II, and IV
A test similar of Borax Bead test is used for identification of coloured cations ifsmicrocosmic salt, $N a (N H_{4}) H P O_{4} \cdot 4 H_{2} O$ , is used.

$N a (N H_{4}) H P O_{4} Δ \to N a P O_{3} + H_{2} O ↑ t r a n s p a r e n t b e a d + N H_{3} ↑$

$N a P O_{3} + C o O \to N a C o P O_{4} (b l u e b e a d)$ .

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Which of the following reaction(s) are not relevant to the microcosmic salt bead test?I. Cr2O3+3B2O3⟶2Cr(BO2)3II. CoO+ZnO⟶CoZnO2III. CoO+NaPO3⟶NaCoPO4IV. Al2(SO4)3+3Na2CO3⟶Al2O3+3Na2SO4+3CO2

The correct option is B I, II, and IVA test similar of Borax Bead test is used for identification of coloured cations ifsmicrocosmic salt, Na(NH4)HPO4⋅4H2O, is used.Na(NH4)HPO4Δ→NaPO3+H2O↑transparentbead+NH3↑NaPO3+CoO→NaCoPO4(bluebead).