Chemistry

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): In a particular point defect, an ionic solid is electrically neutral, even if few of its cations are missing from it unit cells.
Reason (R): In an ionic solid, Frenkel defect arises due to dislocation of cation from its lattice site to interstitial site, maintaining overall electrical neutrality.

In the light of the above statements, choose the most appropriate answer from the options given below:

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Contributor-Level 10

Both statements are correct independently but the reason is not the correct reason of the assertion.

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3 months ago

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A): ICl is more reactive than I?.
Reason (R): I-Cl bond is weaker than I-I bond.

In the light of the above statements, choose the most appropriate answer from the options given below:

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Contributor-Level 10

I - Cl bond is stronger than I-I bond due to additional electrostatic force between I and Cl.

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3 months ago

Chemistry Class 11th

Match List- I with List-II

List -I
(a) Li
(b) Na
(c) KOH
(d) Cs

List-II
(i) absorbent for carbon dioxide
(ii) electrochemical cells
(iii) coolant in fast breeder reactors
(iv) photoelectric cell

Choose the correct answer from the options given below:

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Contributor-Level 10

Li is used in making batteries, liquid Na is a coolant in nuclear reactors. Cs is used in photoelectric cells and KOH as a base is used to absorb acidic oxides like CO?

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3 months ago

Chemistry Periodic Table Elements

Which of the following is suitable to synthesize chlorobenzene?

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3 months ago

The IUPAC name of an element with atomic number 119 is:

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Contributor-Level 10

IUPAC name of element with atomic number 119 is ununennium.

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3 months ago

Chemistry Class 11th

Identify the incorrect statement from the following

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Chemistry Ncert Solutions Chemistry Class 12th

Contributor-Level 10

The oxidation state of K in KO? is (+1).

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3 months ago

When light of wavelength 248 nm falls on a metal of threshold energy 3.0eV, the de-Broglie wavelength of emitted electrons is__________ Angstrom.

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Chemistry Chemistry Chemical Kinetics

Contributor-Level 9

K.E = φ - φ?
φ? = 3 eV = 3 * 1.6 * 10? ¹? J = 4.8 * 10? ¹? J
φ = hc/λ = (6.63 * 10? ³? * 3 * 10? ) / (248 * 10? ) J = 8 * 10? ¹? J
K.E = 8 * 10? ¹? - 4.8 * 10? ¹? = 3.2 * 10? ¹? J
Now using, λ = h / √ (2 K.E m)
λ = (6.63 * 10? ³? ) / √ (2 * 3.2 * 10? ¹? * 9.1 * 10? ³¹) m
λ = (6.63 * 10? ³? ) / (7.63 * 10? ²? ) m = 0.87 * 10? m = 8.7 Å
So, the nearest integer is 9.

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3 months ago

The decomposition of formic acid on gold surface follows first order kinetics. If the rate constant at 300 K is 1.0x10^-3 /s and the activation energy E_a = 11.488 kJ/mol, the rate constant at 200 K is ___________ x10-5 /s. (Round off to the nearest Integer).

[Given R = 8.314 J/molK]

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Contributor-Level 9

T? = 300 K; K? = 1 * 10? ³ s? ¹
T? = 200 K; K? =?
E_a = 11.488 kJ/mol
Using Arrhenius equation:
log (K? /K? ) = (E_a / 2.303R) * [ (T? - T? ) / (T? )]
log (K? / 10? ³) = (11.488 * 10³ / (2.303 * 8.314) * [ (-100) / (6 * 10? )]
log (K? / 10? ³) = -1
K? / 10? ³ = 10? ¹
K? = 10? s? ¹ or K? = 10 * 10? s? ¹

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3 months ago

The equivalents of ethylene diamine required to replace the neutral ligands from the coordination sphere of the trans-complex of CoCl3.4NH3 is _________.

(Round off to the Nearest Integer).

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Chemistry Chemical Equilibrium

Contributor-Level 9

The complex CoCl? ·4NH? is represented as [CoCl? (NH? )? ]Cl.
Here, 4 NH? are neutral monodentate ligands. So, 2 equivalents of ethylene diamine replace 4NH? since ethylene diamine is a didentate ligand.

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3 months ago

For the reaction A(g) B(g) at 495 K, ΔrGo = -9.478kJ/mol. If we start the reaction in a closed container at 495 K with 22 millimoles of A, the amount of B in the equilibrium mixture is __________ millimoles

(Round off to the nearest Integer). [R=8.314 J/mol K; ln 10 = 2.303]

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