Maharashtra HSC Class 12 Chemistry February 2025 question paper

1. A.
   NaCl
2. B.
   KCl
3. C.
   AgBr
4. D.
   NiO

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1. A.
   1.86 °C
2. B.
   $-1.86$ °C
3. C.
   0.186 °C
4. D.
   $-0.186$ °C

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1. A.
   NO
2. B.
   $\mathrm{NO_2}$
3. C.
   $\mathrm{NO_3}$
4. D.
   $\mathrm{N_2O_5}$

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1. A.
   $\mathrm{[CoCl_2(NH_3)_4]Cl}$
2. B.
   $\mathrm{[CoCl(NH_3)_5]Cl_2}$
3. C.
   $\mathrm{[CoCl_3(NH_3)_3]}$
4. D.
   $\mathrm{[Co(NH_3)_6]Cl_3}$

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1. A.
   $-2$
2. B.
   2
3. C.
   $-4$
4. D.
   4

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1. A.
   Nanoparticles
2. B.
   Nanotubes
3. C.
   Nanofilms
4. D.
   Nanorods

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1. A.
   $c = \sqrt{\dfrac{K_a}{\alpha}}$
2. B.
   $\alpha = \sqrt{\dfrac{K_a}{c}}$
3. C.
   $c = \sqrt{K_a\,\alpha}$
4. D.
   $c = \sqrt{\dfrac{\alpha}{K_a}}$

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1. A.
   a benzene ring with $\mathrm{{-}COOH}$ and, two carbons away (meta), $\mathrm{{-}OH}$ (3-hydroxybenzoic acid)
2. B.
   a benzene ring with $\mathrm{{-}COOH}$ and, on the adjacent carbon, $\mathrm{{-}NH_2}$ (anthranilic acid)
3. C.
   a benzene ring with $\mathrm{{-}COOH}$ only (benzoic acid)
4. D.
   a benzene ring with $\mathrm{{-}COOH}$ and, at the para position, $\mathrm{{-}OCH_3}$ (4-methoxybenzoic acid)

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1. A.
   $\Lambda = \dfrac{1000c}{k}$
2. B.
   $c = \dfrac{1000\Lambda}{k}$
3. C.
   $\Lambda = \dfrac{1000k}{c}$
4. D.
   $k = \dfrac{1000}{\Lambda c}$

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1. A.
   Cyclohexylamine
2. B.
   Isopropylamine
3. C.
   Diphenylamine
4. D.
   N, N-Dimethylaniline

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