The d- and f-Block Elements PYQs

Match List-I with List-II: Choose the correct answer from the options given below.

Identify the incorrect statement from the following:

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because:

The calculated spin-only magnetic moment of Ti²⁺ (3d²) is:

Identify the incorrect statement from the following:

Given below are two statements : Statement I : Like nitrogen that can form ammonia, arsenic can form arsine. Statement II : Antimony cannot form antimony pentoxide. In the light of the above statements, choose the most appropriate answer from the options given below.

Which among the following electronic configurations belong to main group elements? A. [Ne]3s¹ B. [Ar]3d³4s² C. [Kr]4d¹⁰5s²5p⁵ D. [Ar]3d¹⁰4s¹ E. [Rn]5f⁰6d²7s² Choose the correct answer from the options given below.

Given below are two statements : Statement I : Ferromagnetism is considered as an extreme form of paramagnetism. Statement II : The number of unpaired electrons in a Cr²⁺ ion (Z = 24) is the same as that of a Nd³⁺ ion (Z = 60). In the light of the above statements, choose the correct answer from the options given below :

Match List - I with List - II Choose the correct answer from the options given below :

‘Spin only’ magnetic moment is same for which of the following ions? A. $\mathrm{Ti^{3+}}$ B. $\mathrm{Cr^{2+}}$ C. $\mathrm{Mn^{2+}}$ D. $\mathrm{Fe^{2+}}$ E. $\mathrm{Sc^{3+}}$ Choose the most appropriate answer from the options given below:

Given below are two statements: Statement I : The boiling point of hydrides of Group 16 elements follows the order H₂O > H₂Te > H₂Se > H₂S. Statement II : On the basis of molecular mass, H₂O is expected to have lower boiling point than the other members of the group but due to presence of extensive H-bonding in H₂O, it has higher boiling point. In the light of the above statements, choose the correct answer from the options given below:

The E° value for the Mn³⁺/Mn²⁺ couple is more positive than that of Cr³⁺/Cr²⁺ or Fe³⁺/Fe²⁺ due to change of:

Among Group 16 elements, which one does NOT show −2 oxidation state?

The products A and B obtained in the following reactions, respectively, are: 3ROH + PCl₃ → 3RCl + A ROH + PCl₅ → RCl + HCl + B

The pair of lanthanoid ions which are diamagnetic is:

Match List-I with List-II. Choose the correct answer from the options given below:

The stability of Cu²⁺ is more than Cu⁺ salts in aqueous solution due to:

Taking stability as the factor, which one of the following represents correct relationship?

Match List-I with List-II : Choose the correct answer from the options given below :

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 Sc₂O₃ to Mn₂O₇. C. Basic character increases from V₂O₃ to V₂O₄ to V₂O₅. D. V₂O₄ dissolves in acids to give VO₄³⁻ salts. E. CrO is basic but Cr₂O₃ is amphoteric. Choose the correct answer from the options given below :

Match List-I with List-II:

Given below are two statements: one is labelled as Assertion (A) and the other as Reason (R). Assertion (A): ICl is more reactive than I₂. Reason (R): I–Cl bond is weaker than I–I bond. Choose the most appropriate answer.

Gadolinium has a low value of third ionisation enthalpy because of:

In the neutral or faintly alkaline medium, KMnO₄ oxidises iodide into iodate. The change in oxidation state of manganese in this reaction is from:

Zr (Z = 40) and Hf (Z = 72) have similar atomic and ionic radii because of:

The structures of beryllium chloride in solid state and vapour phase, are:

The incorrect statement among the following is:

Noble gases are named because of their inertness towards reactivity. Identify an incorrect statement about them.

Identify the correct statements from the following: (a) CO₂(g) is used as refrigerant for ice-cream and frozen food. (b) The structure of C₆₀ contains twelve six carbon rings and twenty five carbon rings. (c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline. (d) CO is colorless and odourless gas.

Which of the following oxoacid of sulphur has – O – O – linkage?

The calculated spin only magnetic moment of Cr²⁺ ion is

HCl was passed through a solution of CaCl₂, MgCl₂ and NaCl, compound(s) crystallise(s)?

Which of the following is not correct about carbon monoxide ?

Identify the incorrect statement.

Crude sodium chloride obtained by crystallisation of brine solution does not contain:

A compound 'X' upon reaction with $H_2O$ produces a colourless gas 'Y' with rotten fish smell. Gas 'Y' is absorbed in a solution of $CuSO_4$ to give $Cu_3P_2$ as one of the products. Predict the compound 'X'.

Which of the following oxoacids of phosphorus has strongest reducing property?

Identify the correct formula of oleum from the following.

When neutral or faintly alkaline $KMnO_4$ is treated with potassium iodide, iodide ion is converted into ‘X’. ‘X’ is

The oxidation state of Cr in $CrO_6$ is:

Formula of nickel oxide with metal deficiency defect in crystal is $Ni_{0.98}O$. The crystal contains $Ni^{2+}$ and $Ni^{3+}$ ions. The fraction of nickel existing as $Ni^{2+}$ ions in the crystal is:

Which one of the following elements is unable to form MF₆³⁻ ion?

Which of the following statements is not true for halogens?

Which of the following oxides is most acidic in nature?

In which pair of ions both the species contain S–S bond?

It is because of inability of ns² electrons of the valence shell to participate in bonding that

The reason for greater range of oxidation states in actinoids is attributed to

Which one of the following statements related to lanthanoids is incorrect?

Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

Strong reducing behaviour of $\mathrm{H_3PO_2}$ is due to:

The stability of +1 oxidation state among Al, Ga, In and Tl increases in the sequence:

In acidic medium, H₂O₂ changes Cr₂O₇²⁻ to CrO₅, which has two (−O−O−) bonds. Oxidation state of Cr in CrO₅ is:

Among the following complexes, the one which shows zero crystal field stabilization energy (CFSE) is:

Magnetic moment 2.83 BM is given by which of the following ions? (Atomic numbers: Ti = 22, Cr = 24, Mn = 25, Ni = 28)

Reason of lanthanoid contraction is:

Roasting of sulphide ores gives the gas X as a by-product. This is a colourless gas with choking smell of burnt sulphur and causes great damage to respiratory organs as a result of acid rain. Its aqueous solution is acidic and acts as reducing agent. The gas X is

The basic structural unit of silicates is

Which of the following does not give oxygen on heating?

Which of the following lanthanoid ions is diamagnetic? (Atomic numbers: Ce = 58, Sm = 62, Eu = 63, Yb = 70)

$KMnO_4$ can be prepared from $K_2MnO_4$ as per the reaction: $$3MnO_4^{2-}+2H_2O \rightleftharpoons 2MnO_4^-+MnO_2+4OH^-$$ The reaction can go to completion by removing OH⁻ ions by adding

In which of the following arrangements the given sequence is not strictly according to the property indicated against it?

The catalytic activity of transition metals and their compounds is ascribed mainly to:

Which one of the following does not correctly represent the order of the property indicated against it?

Which of the following exhibits only +3 oxidation state?

Which of the following statements is incorrect?

Match List-I with List-II for the compositions of substances and select the correct answer using the code given below:

Which of the following oxide is amphoteric?

The compound $A$ on heating gives a colourless gas and a residue that is dissolved in water to obtain $B$. Excess of $CO_2$ is bubbled through aqueous solution of $B$, $C$ is formed which is recovered in the solid form. Solid $C$ on gentle heating gives back $A$. The compound $A$ is :

Which of the following oxidation state is the most common among the lanthanoids?

The stability of $+1$ oxidation state increases in the sequence:

Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states?

Why is NH₃ more soluble in water than PH₃?

Why is F₂ more reactive than Cl₂?

Why is CrO₄²⁻ a stronger oxidizing agent than MoO₄²⁻?

Why do PO₄³⁻ ions exist whereas NO₄³⁻ ions do not?

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is:

In which of the following pairs are both the ions coloured in aqueous solution? (At. no.: Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 27)

Al₂O₃ can be converted to anhydrous AlCl₃ by heating:

Which of the following is the most basic oxide?

Which one of the following orders is not in accordance with the property stated against it?

The aqueous solution containing which one of the following ions will be colourless? (Atomic no.: $Sc = 21$, $Fe = 26$, $Ti = 22$, $Mn = 25$)

The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides is: