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How many compounds liberate `NH_(3)` on heating from the following ? (i) `(NH_(4))_(2)SO_(4) " " (ii) (NH_(4))_(2)CO_(3) " " (iii) NH_(4)Cl` (iv) `NH_

Monjur Alahi

How many compounds liberate `NH_(3)` on heating from the following ?
(i) `(NH_(4))_(2)SO_(4) " " (ii) (NH_(4))_(2)CO_(3) " " (iii) NH_(4)Cl`
(iv) `NH_(4)NO_(3) " " (v) (NH_(4))_(2)Cr_(2)O_(7)`


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Salim Ahmed Kawsar

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Correct Answer - 3 (I,ii, iii)

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In Delhi on a polluted day, concentration of `SO_(2)` in air is 40ppm. Assuming density of air is 2gm/litre. How many gram of `SO_(2)` is present in 1

`40ppm=("Mass of" SO_(2))/("Mass of air")xx10^(6)rArr"Mass of" SO_(2)=(40xx"Mass of air")/(10^(6))` `d_("air")=("Mass of air")/(V_("air")(lit.))=(2gm)/(lit.)rArr"Mass of air"=2xx100=200gm` Mass of `SO_(2)=(400xx200)/(10^(6))=8xx10^(-3)gmrArr 8mg`

2 Answers 1 views
Amongest the following, the total number of compounds whose aqueous solution turns red litmus paper into blue is- `NaCl,Na_(2)SO_(4),CH_(3)COONa,(NH_(

Aqueous solution which are basic in nature- `CH_(3)COOna, Na_(3)PO_(4),NaOH,K_(2)CO_(3)`

2 Answers 1 views
Number of ions which are identified by dil. HCl from the following. `(i) SO_(4)^(2-) " " (ii) CO_(3)^(2-) " " (iii) SO_(3)^(2-) " " (iv) HCO_(3)^(-)`

Correct Answer - 5 (ii, iii, iv, v, vii)

2 Answers 1 views
How many anions evolve brownish gas when treated with dil. /con. HCl ? `(i) CO_(3)^(2-) " " (ii)SO_(3)^(2-) " " (iii) NO_(2)^(-) " " (iv)Cl^(-)` `(v)

Correct Answer - 1 (only iii)

2 Answers 1 views
`Na_(2)CO_(3),NaCl, NaNO_(2),Na_(2)SO_(3),NaBr,CH_(3)CO O Na` are separately treated with `AgNO_(3)` solution. In how many cases white precipitate is/

Correct Answer - 5 (All except NaBr)

2 Answers 2 views
Arrange the following in increasing order as directed. `(a) (i) [CoCl_(3)(NH_(3))_(3)]," "(ii)[CoCl(NH_(3))_(5)]Cl_(2)," "(iii)[Co(NH_(3))_(6)]Cl_(3),

Correct Answer - `(a) i lt iv lt ii lt iii " " (b) X lt O lt N lt C " " ( c) Br^(-) lt S^(2-) lt NO_(3)^(-)...

2 Answers 1 views
How many are redox reaction- `{:((i),K_(4)[Fe (CN)_(6)] + "conc."H_(2)SO_(4) overset(Delta)rarr,(ii),"conc." H_(2)SO_(4) + KCl rarr),((iii),"conc." H_

Correct Answer - 3(iii, viii, ix)

2 Answers 1 views
How many of the following compounds are possible products when chlorine is passed through hypo solution (i) S (ii) HCl (iii) `Na_(2)S` (iv) `Na_(2)SO_

Correct Answer - 3(i, ii and iv)

2 Answers 1 views
How many compound(s) or iron (s) can be oxidised by `H_(2)O_(2)` among the following (i) `AsO_(3)^(2)` (ii) `SO_(4)^(2-)` (iii) `Fe_(2) (SO_(4))_(3)`

Correct Answer - 4(I, iv, v and vi)

2 Answers 1 views
How many of the following liberate `O_(2)` on heating in a dry test tube ? `CaO, Fe_(2)O_(3), Fe_(3)O_(4), FeO, Cr_(2)O_(3), XeF_(4), Al_(2)O_(3), MgO

Correct Answer - `04.5`

2 Answers 1 views

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