Inorganic Compounds, Mohr’s Salt, Potash Alum NEET Questions

Organic Chemistry - Principles of Practical Chemistry

Inorganic Compounds, Mohr’s Salt, Potash Alum MCQ Questions


1.
Which of the following will NOT crystallize easily from a hot saturated solution?
A.
A seeded solution
B.
A super-saturated solution undisturbed
C.
A solution cooled slowly
D.
A solution disturbed continuously while cooling
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ANSWER :
D. A solution disturbed continuously while cooling
2.
An aqueous solution forms a blue precipitate with NaOH which is soluble in NH₄OH giving deep blue colour. The cation is:
A.
Co²⁺
B.
Cu²⁺
C.
Zn²⁺
D.
Ni²⁺
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ANSWER :
B. Cu²⁺
3.
Excess NaOH dissolves which one of these hydroxides giving zincate, aluminate?
A.
Fe(OH)₃ and Cr(OH)₃
B.
Al(OH)₃ and Zn(OH)₂
C.
Cu(OH)₂ and Ni(OH)₂
D.
Mg(OH)₂ and Ca(OH)₂
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ANSWER :
B. Al(OH)₃ and Zn(OH)₂
4.
Lassaigne's test is used to detect:
A.
Water of crystallization
B.
Acidic radicals
C.
N, S, halogens in organic compounds
D.
Cations in inorganic salts
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ANSWER :
C. N, S, halogens in organic compounds
5.
Mohr's salt is also known as:
A.
Ferric ammonium sulphate
B.
Ferric sulphate
C.
Ammonium sulphate
D.
Ferrous Ammonium Sulphate (FAS)
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ANSWER :
D. Ferrous Ammonium Sulphate (FAS)
6.
Cobalt nitrate test (charcoal cavity heated with cobalt nitrate) gives blue colour for:
A.
Al³⁺ (Thenard's blue, CoO·Al₂O₃)
B.
Mg²⁺ (pink mass)
C.
Pb²⁺ (yellow mass)
D.
Zn²⁺ (Rinmann's green)
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ANSWER :
A. Al³⁺ (Thenard's blue, CoO·Al₂O₃)