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Class 11th Chemistry

Which of the following species cannot behave as electrophile?

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Vishal Baghel

Contributor-Level 10

$N H_{4}^{+}$ does not have vacant orbitals, therefore it cannot behave as electrophile.

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Class 11th Chemistry

0.16g of an organic compound gave 0.094g of AgBr by Carius method. The percentage of Br in the compound is (Atomic mass of Ag = 108 u, Br = 80 u)

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Vishal Baghel

Contributor-Level 10

Percentage Br = $\frac{80 * 0.094}{188 * 0.16} * 100 = 25 %$

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Class 11th Chemistry

The correct order of atomic radii in group 13 element is

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Vishal Baghel

Contributor-Level 10

Correct order or atomic radii is

Tl > ln > Al > Ga > B

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Class 11th Chemistry

Which one of the following ions has the largest size in aqueous solution?

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Vishal Baghel

Contributor-Level 10

Li⁺ has the largest size in aqueous solution due to its high polarizing power.

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Class 11th Physics Thermal Properties of Matter

A black body at $22 7^{o} C$ radiates heat at the rate of 7 $c a l s / c m^{2} s$ . At a temperature of $72 7^{o} C$ , the rate of heat radiated in the same units will be

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Raj Pandey

Contributor-Level 9

Rate of heat radiated at (227 + 273) K

$= 7 c a l s / (c m^{2} s)$

Let rate of heat radiated at (727+ 273) K = xcals/ (cm²s)

By Stefan's law

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Class 11th Chemistry

The molarity of 20 volume H₂O₂ is nearly

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Vishal Baghel

Contributor-Level 10

Volume strength of H₂O₂ = Molarity * 11.2

$∴ M o l a r i t y = \frac{V}{11.2} = \frac{20}{11.2} = 1.78 \approx 1.8$

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Class 11th Chemistry

The compound which will not show geometrical isomerism is

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Vishal Baghel

Contributor-Level 10

In (Ph)₂C = CHCN₃, no spatial variation is possible

It will not show geometrical isomerism.

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Class 11th Physics

n droplets of water each of radius r coalesce to form a big drop of radius R. If the energy released during coalescence goes into heating the drop, then the rise in temperature will be (take T as surface tension of water and J as mechanical equivalent of heat)