Chemical Reactivity

Q. Which one of the following represents the electronic configuration of the most electropositive element?

1. $\left[He\right]2s^1$
2. $\left[Xe\right]6s^1$
3. $\left[He\right]2s^2$
4. $\left[Xe\right]6s^2$

Q. Of the given hydrides of group 16 Elements, which is the most stable thermodynamically?

1. $H_{2}Te$
2. $H_{2}S$
3. $H_{2}O$
4. $H_{2}Se$

Q. Which of the following molecule does not produce $HCl$ as one of the hydrolysed product?

1. $NC{l}_3$
2. $PC{l}_3$
3. $AsC{l}_3$
4. $SbC{l}_3$

Q. $\Delta H_f^{\circ }$ of a hypothetical salt, $MX$ is $150{\text{kJmol}}^{-1}$ and for $M{X}_2$ it is $-600{\text{kJmol}}^{-1}$. The enthalpy of disproportionation of $MX$ is $-100{\text{x kJmol}}^{-1}$. The value of $x$ is

Q. Which of the following order is correct of reducing strength in water-

1. $Cs>Rb>K>Na>Li$
2. $Li>Na>K>Rb>Cs$
3. $Li>Cs>Rb>K>Na$
4. None of these