STD 12 - 4. d and f- block elements — NEET STD 11 Science — Question

$\begin{gathered}
  {\left[ {Al{{\left( {{H_2}O} \right)}_6}} \right]^{ + 3}} + HCO_3^ -  \rightleftarrows {\left[ {Al{{\left( {{H_2}O} \right)}_5}OH} \right]^{ + 2}} + {H_2}C{O_3} \hfill \\
  \,\,\,\,\,\,\,\,\,\,\,\,(A)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(B)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(C)\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(D) \hfill \\ 
\end{gathered} $

species behaving as bronsted -lowry acid are

$(A)$ $n=4,1=1$   $(B)$ $\mathrm{n}=4,1=2$    $(C)$ $\mathrm{n}=3,1=1$     $(D)$ $\mathrm{n}=3,1=2$     $(E)$ $n=4,1=0$

Choose the correct answer from the options given below:

(image)

The transition temperature for $\alpha$ to $\beta$ phase change is $600 \mathrm{~K}$ and $C_{p, \beta}-C_{p, \alpha}=1 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$. Assume $\left(C_{p, \beta}-C_{p, \alpha}\right)$ is independent of temperature in the range of 200 to $700 \mathrm{~K} . \mathrm{C}_{p, \alpha}$ and $C_{p, \beta}$ are heat capacities of $\alpha$ and $\beta$ phases, respectively.

($1$)The value of entropy change, $\mathrm{S}_\beta-\mathrm{S}_\alpha$ (in $\mathrm{J} \mathrm{mol}^{-1} \mathrm{~K}^{-1}$ ), at $300 \mathrm{~K}$ is. . . . . . .

[Use : $\ln 2=0.69$  Given : $S_\beta-S_\alpha=0$ at $\left.0 \mathrm{~K}\right]$

($2$) The value of enthalpy change, $\mathrm{H}_\beta-\mathrm{H}_\alpha$ (in $J$ mol ${ }^{-1}$ ), at $300 \mathrm{~K}$ is

Give the answer quetion ($1$) and ($2$)

Assertion $(A)$: Cis form of alkene is found to be more polar than the trans form

Reason $(R)$: Dipole moment of trans isomer of $2$-butene is zero.

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