Assertion (A) & Reason (B) MCQ

Question 11 Mark

Assertion $(A)$: For strong electrolytes, there is a slow increase in molar conductivity with dilution and can be represented by the equation
$\Lambda_m^0=\Lambda_m-A c^{1 / 2}$
Reason $(R)$: The value of the constant $'A\ '$ for $\ce{NaCl, CaCl_2},$ and $\ce{MgSO_4}$ in a given solvent and at a given temperature is different.

Answer

$A$ is false but $R$ is true.
$\Lambda_m^{\circ}=\Lambda_m-A c^{1 / 2}$ is an incorrect equation, the correct equation is $\Lambda_m=\Lambda_m^0-A c^{1 / 2}$

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Question 21 Mark

Assertion $(A): \ce{[Mn(CN)_6]}^3- $ has a magnetic moment of two unpaired electrons while $\ce{[MnCl_6]^{3-}}$ has a paramagnetic moment of four unpaired electrons.
Reason $(R): \ce{[Mn(CN)_6]^{3-}}$ is inner orbital complexes involving $\ce{d^2sp^3}$ hybridisation, on the other hand, $\ce{[MnCl_6]^{3-}}$ is outer orbital complexes involving $\ce{sp^{3}d^2}$ hybridisation.

Answer

Both $A$ and $R$ are true and $R$ is the correct explanation of $A$

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Question 31 Mark

Assertion $(A)$: The half $-$ life for a zero order reaction is independent of the initial $1$ concentration of the reactant.
Reason $(R)$: For a zero order reaction, Rate $= k$

Answer

$A$ is false but $R$ is true.
The half $-$ life for a zero order reaction $t_{1⁄2 }= [Ro] / 2K$ where $[Ro]$ is the initial concentration of the reactant.

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Question 41 Mark

Assertion $(A)$ : Glucose does not form the hydrogensulphite addition product with $\ce{NaHSO_3}$ .
Reason $(R)$ : Glucose exists in a six $-$ membered cyclic structure called pyranose structure

Answer

Both $A$ and $R$ are true but $R$ is not the correct explanation of $A$.
Due to the absence of a free aldehydic group, it does not give a reaction with $\ce{NaHSO_3}.$

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Chemistry Assertion (A) & Reason (B) MCQ

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