JEE Chemistry - Qualitative Analysis

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Question - 1

Among \(\mathrm{PbS}, \mathrm{CuS}, \mathrm{HgS}, \mathrm{MnS}, \mathrm{CoS}, \mathrm{Bi}_{2} \mathrm{~S}_{3}, \mathrm{SnS}_{2}\) How many ore black in colour

  • A 5.00
  • B 2.01
  • C 3.00
  • D 45.0

Question - 2

How many of the following given white ppt will dil. HCI - \(\mathrm{Pb}^{+2}, \mathrm{Ba}^{+2}, \mathrm{Mn}^{+2}, \mathrm{Zn}^{+2}, \mathrm{Ag}^{+}, \mathrm{Hg}_{2}^{+2}\)

  • A 1.20
  • B 3.00
  • C 4.52
  • D 6.10

Question - 3

How many of the following given ppt with \(\mathrm{H}_{2} \mathrm{~S}\) in the presence of HCI \(\mathrm{Cu}^{+2}, \mathrm{As}^{+3}, \mathrm{Zn}^{+2}, \mathrm{Fe}^{+2}, \mathrm{Al}^{+3}\), \(\mathrm{Na}^{+}, \mathrm{Bi}^{+3}, \mathrm{Cd}^{+2}\)

  • A 2.00
  • B 5.10
  • C 1.00
  • D 4.00

Question - 4

Which of the following does not given precipitate when excess of NH4OH is added -
\(\mathrm{Pb}^{+2}, \mathrm{Ag}^{+}, \mathrm{Zn}^{+2}, \mathrm{Cu}^{+2}, \mathrm{Ni}^{+2}, \mathrm{Fe}^{+3}, \mathrm{Al}^{+3}, \mathrm{Hg}^{+2}, \mathrm{Hg}_{2}^{+2}\)

  • A 5.00
  • B 2.10
  • C 73.0
  • D 3.01

Question - 5

How many salts upon heating does not given any residue -
\(\mathrm{NH}_{4} \mathrm{Cl}, \mathrm{NaNO}_{3}, \mathrm{NH}_{4} \mathrm{NO}_{3}, \mathrm{NH}_{4} \mathrm{NO}_{2}, \mathrm{CuSO}_{4} .5 \mathrm{H}_{2} \mathrm{O}, \mathrm{FeSO}_{4} .7 \mathrm{H}_{2} \mathrm{O}, \mathrm{AlCl}_{3}(\mathrm{~s})\)

  • A 2.10
  • B 4.00
  • C 7.30
  • D 5.00

Question - 6

Radicals belongs to fourth group of basic radical. \(\mathrm{Al}^{+3}, \mathrm{Fe}^{+3}, \mathrm{Ni}^{+2}, \mathrm{Zn}^{+2}, \mathrm{Sr}^{+2}, \mathrm{Ca}^{+2}, \mathrm{Co}^{+2}, \mathrm{Mn}^{+2}\)

  • A 4.00
  • B 1.02
  • C 4.10
  • D 2.10

Question - 7

\(\underset{\text { Black }}{\mathrm{X}(\mathrm{S}) \stackrel{\mathrm{dil} \mathrm{HCl}}{\longrightarrow} \mathrm{Y} \uparrow} \frac{\mathrm{Na}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{5}(\mathrm{NO})\right]}{\mathrm{NaOH}}\)
Purple solution gas Y has been allowed to react with following species in neutraUacidic medium:
\((a) \mathrm{FeCl}_{3} \)
\((b) \mathrm{CuSO}_{4} \)
\((c) \mathrm{BaCl}_{2} \)
\((d) \mathrm{SO}_{2} \)
\((e) \mathrm{Cr}_{2} \mathrm{O}_{7}^{2-} \)
\((f) \mathrm{CH}_{3} \mathrm{COONa} \)
\((g) \mathrm{Hg}_{2}^{2+}\)
Then calculate value of (P + Q - R)
P : Number of species which undergoes redox reaction with gas Y.
Q : Number of species with which gas Y undergoes precipitation.
R : Number of species with which gas Y produce no observable change.

  • A 2.10
  • B 42.3
  • C 1.02
  • D 4.00

Question - 8

Consider the following reaction
\(\mathrm{Na}_{3} \mathrm{PO}_{4}+\left(\mathrm{NH}_{4}\right)_{2} \mathrm{MoO}_{4}+\mathrm{HNO}_{3}(\text { dil. }) \rightarrow \text { 'X' }\)
(canary yellow ppt)
Then calculate total number of atoms of 15th group elements which are sp3 hybridized in compound 'x'.

  • A 4.00
  • B 2.30
  • C 5.223
  • D 10.00

Question - 9

An aqueous solution of contains \(\mathrm{Hg}^{2+}, \mathrm{Hg}_{2}^{2+}, \mathrm{Pb}^{2+} \text { and } \mathrm{Cd}^{2+} \text {. }\) Out of these, how many ions will produce white precipitate with dilute HCl ?

  • A 1.20
  • B 2.00
  • C 14.01
  • D 2.324

Question - 10

How many of the followers compounds evolve NH3 on heating?
\( \mathrm{NH}_{4} \mathrm{Cl}, \mathrm{NH}_{4} \mathrm{NO}_{3},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{CO}_{3},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}, \mathrm{NH}_{4} \mathrm{HCO}_{3}, \mathrm{NH}_{4} \mathrm{NO}_{2},\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}, \mathrm{Mg}\left(\mathrm{NH}_{4}\right) \mathrm{PO}_{4} . \)

  • A 1
  • B 5
  • C 4
  • D 3
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