$\bf{A}$ is a common element. $\bf{B}$ is a disodium salt of a common oxyacid of $\bf{A}$, containing water of crystallization, and the formula weight of $\bf{B}$ does not exceed 300. When $\bf{B}$ is decomposed by heating, it loses $36.3\%$ of its weight, corresponding to the loss of all water of crystallization. When an appropriate amount of $Cl_2$ is passed into the $NaOH$ solution of $\bf{B}$, concentrated and crystallized, a sodium salt crystal $\bf{C}$ is obtained. If excess $Cl_2$ is passed into the solution and then concentrated, a crystal $\bf{D}$ containing $\bf{A}$ is obtained. $\bf{C}$ loses $14.9\%$ of its weight at $130^\circ C$ and transforms into $\bf{E}$. The anion of $\bf{E}$ has two lengths of covalent bonds. $\bf{E}$ is further heated to $300^\circ C$ and transforms into $\bf{F}$, and the anion of $\bf{F}$ has only one length of covalent bond.

The following are several propositions about the above elements and substances:

1. The element $\bf{A}$ exists as a liquid in its elemental form at room temperature and pressure.
2. $\bf{B}$ has strong oxidizing properties.
3. When $\bf{B}$ is converted to $\bf{D}$, the theoretical molar ratio of $\bf{B}$ to $Cl_2$ is $1:1$.
4. The most stable conformation of the anion of $\bf{C}$ does not have a center of symmetry.
5. The process of converting $\bf{E}$ to $\bf{F}$ produces a colorless and odorless gas.
6. The most stable conformation of the anion in $\bf{F}$ contains a center of symmetry.
7. In the anions of $\bf{B},\bf{C},\bf{D},\bf{F}$ respectively, all elements have only one chemical environment.
8. The formula weight of the anion in $\bf{B}$ is greater than the formula weight of the anion in $\bf{D}$.

Given that the number of true propositions is not a prime number, select the correct option below.
$\bf{A}$为一种常见元素。$\bf{B}$为$\bf{A}$的一种常见含氧酸的二钠盐，含有结晶水，$\bf{B}$的式量不超过300。$\bf{B}$受热分解时失重$36.3\%$，对应于失去全部结晶水。向$\bf{B}$的$NaOH$溶液中通入适量$Cl_2$，浓缩结晶，得到钠盐晶体$\bf{C}$。若向该溶液中通入过量$Cl_2$后浓缩，则得到含$\bf{A}$的晶体$\bf{D}$。$\bf{C}$在$130^\circ C$下失重$14.9\%$并转化为$\bf{E}$。$\bf{E}$的阴离子中有两种长度的共价键。$\bf{E}$再加热至$300^\circ C$转化为$\bf{F}$，$\bf{F}$的阴离子中只有一种长度的共价键。

下面是关于上述元素和物质的几个命题：

1. 元素$\bf{A}$的单质在常温常压下是液体。
2. $\bf{B}$具有强氧化性。
3. $\bf{B}$转化为$\bf{D}$时，$\bf{B}$与$Cl_2$的理论摩尔比是$1:1$。
4. $\bf{C}$阴离子的最稳定构象不存在对称中心。
5. $\bf{E}$转化为$\bf{F}$的过程中产生无色无味气体。
6. $\bf{F}$中阴离子的最稳定构象含有对称中心。
7. $\bf{B},\bf{C},\bf{D},\bf{F}$各自的阴离子中，所有元素都只有一种化学环境。
8. $\bf{B}$中阴离子的式量大于$\bf{D}$中阴离子的式量

已知其中真命题的数量不为质数，选择以下正确的选项。
All other options are incorrect
The number of incorrect descriptions is even.
The product of the indices of all error descriptions does not exceed 2000
The sum of the indices of all correctly described items does not exceed 8.
Among the indices of correct descriptions, there are more odd numbers than even numbers.
The difference between the largest index of incorrect descriptions and the smallest index of correct descriptions is an even number.
其他选项均不正确
所有描述中错误的数量为偶数
所有错误描述的序号的乘积不超过2000
所有正确描述的序号之和不超过8
所有正确描述的序号里，奇数比偶数多
最大的错误描述的序号与最小的正确描述的序号之差为偶数
Let the chemical formula of $\bf{B}$ be $Na_2\bold{A}_xO_y \cdot zH_2O$, then the formula weight $M(\bold{B})=18.02z/36.3\%=49.6z, M(\bold{A}_xO_y)=31.6z-46$.

<Checkpoint>[$M(\bold{A}_xO_y)=31.6z-46$](1.5)</Checkpoint>

Since $M(\bold{B})<300$, then $2\leq z\leq 6$.

<Checkpoint>[$2\leq z \leq 6$](1)</Checkpoint>

Trying in sequence, we find that when $z=4$, $\bf{B}$ has a reasonable solution $Na_2SO_3\cdot4H_2O$, and when $z=5$, it has a reasonable solution $Na_2S_2O_3\cdot 5H_2O$. There are no other reasonable solutions.

<Checkpoint>[$\bf{A}$ is $S$](0.5)</Checkpoint>

<Checkpoint>[$\bf{B}$ may be $Na_2SO_3\cdot4H_2O$ or $Na_2S_2O_3\cdot5H_2O$](5)</Checkpoint>

Regardless of which of the above two cases $\bf{B}$ is, it can be known that $\bf{D}$ is $Na_2SO_4\cdot10H_2O$. The weight loss of $\bf{C}$ to $\bf{E}$ is also a water loss process. Combined with calculation, $\bf{E}$ is $Na_2S_2O_6$, so $\bf{C}$ is $Na_2S_2O_6\cdot2H_2O$. $\bf{F}$ is $Na_2SO_4$.

<Checkpoint>[$\bf{D}$ is $Na_2SO_4\cdot10H_2O$](0.5)</Checkpoint>

<Checkpoint>[$\bf{C}$ is $Na_2S_2O_6\cdot2H_2O$](1)</Checkpoint>

<Checkpoint>[$\bf{E}$ is $Na_2S_2O_6$](2)</Checkpoint>

<Checkpoint>[$\bf{F}$ is $Na_2SO_4$](1)</Checkpoint>

If $\bf{B}$ is $Na_2SO_3\cdot4H_2O$, then the correct descriptions are 3 and 7, which contradicts "the number of correct descriptions is not a prime number". If $\bf{B}$ is $Na_2S_2O_3\cdot5H_2O$, then only 8 is the correct description. Therefore, $\bf{B}$ is $Na_2S_2O_3\cdot5H_2O$.

<Checkpoint>[$\bf{B}$ is $Na_2S_2O_3\cdot5H_2O$](2)</Checkpoint>

<Checkpoint>[The correct description is 8](1)</Checkpoint>

Therefore, the correct answer is D.
设$\bf{B}$的化学式为$Na_2\bold{A}_xO_y \cdot zH_2O$，则式量$M(\bold{B})=18.02z/36.3\%=49.6z, M(\bold{A}_xO_y)=31.6z-46$。

<Checkpoint>[$M(\bold{A}_xO_y)=31.6z-46$](1.5)</Checkpoint>

由于$M(\bold{B})<300$，故$2\leq z\leq 6$。

<Checkpoint>[$2\leq z \leq 6$](1)</Checkpoint>

依次尝试，发现$z=4$时$\bf{B}$有合理解$Na_2SO_3\cdot4H_2O$，$z=5$时有合理解$Na_2S_2O_3\cdot 5H_2O$。其余无合理解。

<Checkpoint>[$\bf{A}$是$S$](0.5)</Checkpoint>

<Checkpoint>[$\bf{B}$可能是$Na_2SO_3\cdot4H_2O$或$Na_2S_2O_3\cdot5H_2O$](5)</Checkpoint>

无论$\bf{B}$是上述两种情况的哪一个，都可知$\bf{D}$是$Na_2SO_4\cdot10H_2O$。$\bf{C}$失重为$\bf{E}$也是失水过程，结合计算，$\bf{E}$是$Na_2S_2O_6$，从而$\bf{C}$是$Na_2S_2O_6\cdot2H_2O$。$\bf{F}$是$Na_2SO_4$。

<Checkpoint>[$\bf{D}$是$Na_2SO_4\cdot10H_2O$](0.5)</Checkpoint>

<Checkpoint>[$\bf{C}$是$Na_2S_2O_6\cdot2H_2O$](1)</Checkpoint>

<Checkpoint>[$\bf{E}$是$Na_2S_2O_6$](2)</Checkpoint>

<Checkpoint>[$\bf{F}$是$Na_2SO_4$](1)</Checkpoint>

如果$\bf{B}$是$Na_2SO_3\cdot4H_2O$，则正确的描述是3和7，与“正确描述的数量不是质数”矛盾，如果$\bf{B}$是$Na_2S_2O_3\cdot5H_2O$，则正确的描述只有8。因此$\bf{B}$是$Na_2S_2O_3\cdot5H_2O$。

<Checkpoint>[$\bf{B}$是$Na_2S_2O_3\cdot5H_2O$](2)</Checkpoint>

<Checkpoint>[正确的描述是8](1)</Checkpoint>

因此正确答案是D。