Question Bank Directory

Which of the statements is not true?

$\text{HgCl}_2$ and $\text{I}_2$ both when dissolved in water containing $\text{I}^-$ ions, the pair of species formed is:

The decrease in size from left to right in the actinoid series is greater and more gradual than that in the lanthanoid series due to:

Which of the following statements are incorrect? A. All the transition metals except scandium form MO oxides which are ionic. B. The highest oxidation number corresponding to the group number in transition metal oxides is attained in $Sc_2O_3$ to $Mn_2O_7$. C. Basic character increases from $V_2O_3$ to $V_2O_4$ to $V_2O_5$. D. $V_2O_4$ dissolves in acids to give $VO_4^{3-}$. E. CrO is basic, but $Cr_2O_3$ is amphoteric. Choose the correct answer from the options given below:

Which one of the following statements is correct when $\text{SO}_2$ is passed through acidified $\text{K}_2\text{Cr}_2\text{O}_7$ solution?

The correct order of ionic radii of $Y^{3+}$, $La^{3+}$, $Eu^{3+}$, and $Lu^{3+}$ is: (Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)

Which of the following statements is not correct about diborane?

Which of the following species is not stable?

A compound among the following having a similar structure to graphite is:

The basic structural unit of silicates is:

A diamagnetic lanthanoid ion among the following is : (At. numbers: $\text{Ce} = 58$, $\text{Sm} = 62$, $\text{Eu} = 63$, $\text{Yb} = 70$)

Urea reacts with water to form A which will decompose to form B. B when passed through $Cu^{2+}(aq)$, deep blue colour solution C is formed. What is the formula of C from the following?

The number of moles of $MnO_4^-$ being reduced to $Mn^{2+}$ under acidic conditions by $4.517 \times 10^{24}$ electrons are:

Choose the correct statement:

Match Column-I with Column-II and mark the most appropriate option: **Column-I (Metal ion)** (A) $\text{Co}^{3+}$ (B) $\text{Cr}^{3+}$ (C) $\text{Fe}^{3+}$ (D) $\text{Ni}^{2+}$ **Column-II (Spin magnetic moment)** (i) $\sqrt{8}\text{ B.M.}$ (ii) $\sqrt{35}\text{ B.M.}$ (iii) $\sqrt{15}\text{ B.M.}$ (iv) $\sqrt{24}\text{ B.M.}$

The pair of lanthanoid ions, consisting of elements which are diamagnetic, is:

The pair of compounds that can exist together is:

The number of hydrogen bonded water molecules(s) associated with CuSO₄·5H₂O is:

Given below are two statements: Assertion (A): Ionisation enthalpies of early actinoids are lower than early lanthanoids. Reason (R): Electrons entering $5f$ orbitals in actinoids experience greater shielding from the nuclear charge. In the light of the above statements, choose the most appropriate answer from the options given below:

Find out the major product X in the reaction given: $FeCr_2O_4 + Na_2CO_3 + O_2 \rightarrow X + Fe_2O_3 + CO_2$