Class 12th

The major product in the following reaction

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Contributor-Level 10

Kindly consider the below image

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Match the List-I with List-II

List-I	List-II
(A) N₂(g) + 3H₂(g) -> 2NH₃(g)	(I) Cu
(B) CO(g) + 3H₂(g) -> CH₄(g) + H₂O(g)	(II) Cu/ZnO – Cr₂O₃
(C) CO(g) + H₂(g) -> HCOH(g)	(III) Fe_xO_y + K₂O + Al₂O₃
(D) CO(g) + 2H₂(g) -> CH₃OH(g)	(IV) Ni

Choose the correct answer from the options given below:

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Class 12th Chemistry Solutions

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Uses of catalyst is very specific for a particular reaction.

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The depression in freezing point observed for a formic acid solution of concentration 0.5 mL L^-1 is $0.0405 ° C .$ Density of formic acid is 1.05 g mL^-1. The Van't Hoff factor of the formic acid solution is nearly: (Given for water $K_{f} = 1.86 k k g m o l^{- 1}$ )

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Contributor-Level 10

Let we take $1 l$ of solution

Mass of solute = Volume * Density

= 0.5 $m l * 1.05 g m / m l$

= 0.525 gram

Mass of solution = 1 kg. [considering very dilute solution]

Mass of solvent = 1000 – 0.525 = 999.475 gram

$\Rightarrow i = 1.9$

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The most common oxidation state of Lanthanoid elements is +3. Which of the following is likely to deviate easily from +3 oxidation state?

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Contributor-Level 10

$C e^{3 +} \to [X e] 4 f^{1} 5 d^{0}$

$C e^{4 +} \to [X e] 4 f^{0} 5 d^{0}$ (Noble gas configuration)

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SO₂Cl₂ on reaction with excess of water results into acidic mixture

SO₂Cl₂ + H₂O -> H₂SO₄ + 2HCl

16 moles of NaOH is required for the complete neutralization of the resultant acidic mixture. The number of moles of SO₂Cl₂ used is:

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Contributor-Level 10

Let a moles of SO₂Cl₂ is taken

Then no. of moles of H₂SO₄ = a moles

No. of moles of HCl = 2a moles

No. of moles of NaOH required = 2a + 2a = 4a = 16

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The role depressants in 'Froth Floatation method' is to

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Class 12th Physics Moving Charges and Magnetism

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In sulphide ore, depressants selectively prevent impurity from coming to the fourth.

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Metallic disc of inner radius and outer radius $2 R$ is rotating with an angular speed w . What will be the electric potential difference that appears between the inner and outer periphery. The mass of electrons is $m$ and charge is $e$ .

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Vishal Baghel

Contributor-Level 10

Answer (1)

$e E = e \frac{d V}{d r} = m ω^{2} r$

$? V = \int d V = \int_{R}^{2 R} \frac{m}{e} ω^{2} r d r$

$= ? V = \frac{3 m ω^{2} R^{2}}{2 e}$

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Class 12th Chemistry Coordination Compounds

Total number of relatively more stable isomer(s) possible for octahedral complex $[C u {(e n)}_{2} {(S C N)}_{2}]$ will be________________.

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$[C u {(e n)}_{2} {(S C N)}_{2}]$

More stable isomers = 3 (trans isomers)

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Match List I with List II

List I Enzyme	List II Conversion of
A. Invertase	I. Starch into maltose
B. Zymase	II. Maltose into glucose
C. Diastase	III. Glucose into ethanol
D. Maltase	IV. Cane sugar into glucose

Choose the most appropriate answer from the options given below

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Contributor-Level 10

Invertase → Cane sugar to glucose and fructose

Zymase → Glucose to ethanol

Diastase → Starch to Maltose

Maltase → Maltose to glucose

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Class 12th Physics

In the circuit shown below, maximum zener diode current will be _________mA.

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