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Ncert Solutions Chemistry Class 12th

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Ncert Solutions Chemistry Class 12th Class 12th

Match List – I with List – II:

List – I List – II

(A) Sphalerite (I) FeCO₃

(B) Calamine (II) PbS

(C) Galena (III) ZnCO₃

(D) Siderite

...more

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alok kumar singh

Contributor-Level 10

Sphalarite ZnS

Calamine ZnCO₃

Galena PbS

Siderite FeCO₃

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Ncert Solutions Chemistry Class 12th Class 12th

A copper complex crystallizing in a CCP lattice with a cell edge of 0.4518 nm has been revelaed by employing X-ray diffraction studies. The density of a copper complex is found to be 7.26 g cm^-3. The molar mass of copper complex is___________ g mol^-1. (Nearest integer)

[Given : N_A = 6.022 * 10²³ mol^-1]

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alok kumar singh

Contributor-Level 10

Density, $ρ = 7.62 g c m^{- 3}$

Cell edge, a = 0.4518nm = 0.458 * 10^-7 cm

Effective number of atoms, Z = 4 for CCP.

Using ; $ρ = \frac{Z * A}{N_{A} * a^{3}}$

$ρ = \frac{4 * A}{6.022 * 1 0^{23} * {(0.458 * 1 0^{- 7})}^{3}}$

$7.62 = \frac{4 * A}{6.022 * {(0.4518)}^{3} * 1 0^{2}}$

A = 105.79 g/mol

Ans. is 106 (the nearest integers)

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Ncert Solutions Chemistry Class 12th Class 12th

Which one of the following group – 15 hydride is the strongest reducing agent?

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alok kumar singh

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Reducing power for group-15 hydrides increases down the group, so BiH₃ is the strongest reducing agent.

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Ncert Solutions Chemistry Class 12th Class 12th

Sulphide ion is soft base and its ores are common for metals.

(A) Pb (B) Al (C) Ag (D) Mg

Choose the correct answer from the options given below:

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alok kumar singh

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Sulphide ion (s²^-) form ores commonly with Pb & Ag as PbS and Ag₂S

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Ncert Solutions Chemistry Class 12th Class 12th

Match List – I with List – II:

Choose the correct answer from the options given below:

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alok kumar singh

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Ncert Solutions Chemistry Class 12th Class 12th

An organic compound A (C₆H₆O) gives dark green colouration with ferric chloride. On treatment with CHCl₃ and KOH, followed by acidification gives compound B. Compound B can also be obtained from compound C on reaction with pyridinium chlorochromate (PCC). Identify A, B and C.

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alok kumar singh

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Compound A is phenol since phenol gives dark green colour with FeCl₃.

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Ncert Solutions Chemistry Class 12th Class 12th

Which one of the following 0.06M aqueous solutions has lowest freezing point?

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alok kumar singh

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Depression in freezing point will be maximum for Al₂ (SO₄)₃ since its Van't Hoff factor is the highest. So its solution will have the lowest freezing point.

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Ncert Solutions Chemistry Class 12th Class 12th

When silver nitrate solution is added to potassium iodide solution then the sol produced is:

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