Inorganic Chemistry Questions

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:

The correct order in which the O — O bond length increases in the following is :

Which of the following is the electron deficient molecule ?

What is the correct relationship between the pHs of isomolar solutions of sodium oxide (pH1), sodium sulphide (pH2), sodium selenide (pH3) and sodium telluride (pH4) ?

The correct sequence of increasing covalent character is represented by :

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

The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is :

Which of the statements is NOT true?

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:

Identify the wrong statement in the following:

When ${\text{Cl}}_2$ gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from:

Which one of the alkali metals forms only the normal oxide, ${\text{M}}_2\text{O}$ on heating in air?

Which one of the following is an outer orbital complex and exhibits paramagnetic behaviour?

Sulphur trioxide can be obtained by which of the following reaction:

The pair of compounds that can exist together is:

(a) ${\text{H}}_2{\text{O}}_2+{\text{O}}_3\to {\text{H}}_2\text{O}+2{\text{O}}_2$ (b) ${\text{H}}_2{\text{O}}_2+{\text{Ag}}_2\text{O}\to 2\text{Ag}+{\text{H}}_2\text{O}+{\text{O}}_2$ The role of hydrogen peroxide in the above reactions is respectively:

In acidic medium, ${\text{H}}_2{\text{O}}_2$ changes ${\text{Cr}}_2{\text{O}}_7^{2-}$ to ${\text{CrO}}_5$ which has two $(–\text{O}–\text{O}–)$ bonds. The oxidation state of $\text{Cr}$ in ${\text{CrO}}_5$ is:

The reaction of aqueous ${\text{KMnO}}_4$ with ${\text{H}}_2{\text{O}}_2$ in acidic conditions gives:

The reason for lanthanoid contraction is:

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

On heating which of the following releases ${\text{CO}}_2$ most easily?

Strong reducing behaviour of ${\text{H}}_3{\text{PO}}_2$ is due to:

Which of the statements given below is incorrect?

The name of complex ion, $[\text{Fe}(\text{CN}{)}_6{]}^{3-}$ is:

The hybridization involved in complex $[\text{Ni}(\text{CN}{)}_4{]}^{2-}$ is: (Atomic number of $\text{Ni}=28$)

The stability of $+1$ oxidation state among $\text{Al, Ga, In}$ and $\text{Tl}$ increases in the sequence:

The sum of coordination number and oxidation number of metal $\text{M}$ in the complex $[\text{M}(en{)}_2({\text{C}}_2{\text{O}}_4)]\text{Cl}$ (Where $en$ is ethylenediamine) is:

Number of possible isomers for the complex $[\text{Co}(en{)}_2{\text{Cl}}_2]\text{Cl}$ will be: ($en$ = ethylene diamine)

The variation of the boiling points of the hydrogen halides is in the order $\text{HF}>\text{HI}>\text{HBr}>\text{HCl}$. What explains the higher boiling point of hydrogen fluoride?

Assertion : Extraction of iron metal from iron oxide ore is carried out by heating with coke.Reason : The reaction ${\text{Fe}}_2{\text{O}}_{3(s)}\to {\text{Fe}}_{(s)}+3/2{\text{O}}_{2(g)}$ is a spontaneous process.

The mass of carbon anode consumed (giving only carbondioxide) in the production of 270 kg of aluminium metal from bauxite by the Hall process is : (Atomic mass Al = 27)

Which one of the following molecules has trigonal planar geometry ?

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy ?

Assertion : Reaction of ${\text{SO}}_2$ and ${\text{H}}_2\text{S}$ in the presence of ${\text{Fe}}_2{\text{O}}_3$ catalyst gives elemental sulphur.Reason : ${\text{SO}}_2$ is a reducing agent.

Assertion : ${\text{SiF}}_6^{2-}$ is known but ${\text{SiCl}}_6^{2-}$ is not.Reason : Size of fluorine is small and its lone pair of electrons interacts with $d$ -orbitals of $\text{Si}$ strongly.

Assertion : Borax bead test is not suitable for $\text{Al(III)}$.Reason : ${\text{Al}}_2{\text{O}}_3$ is insoluble in water.

Assertion : Ozone is a powerful oxidising agent in comparison to ${\text{O}}_2$.Reason : Ozone is diamagnetic but ${\text{O}}_2$ is paramagnetic.

Assertion : Potassium ferrocyanide is diamagnetic whereas potassium ferricyanide is paramagnetic.Reason : Crystal field splitting in ferrocyanide ion is greater than that of ferricyanide ion.

Assertion : Addition of ${\text{NH}}_4\text{OH}$ to an aqueous solution of ${\text{BaCl}}_2$ in the presence of ${\text{NH}}_4\text{Cl}$ (excess) precipitates $\text{Ba}(\text{OH}{)}_2$.Reason : $\text{Ba}(\text{OH}{)}_2$ is insoluble in water.

Assertion : ${\text{SeCl}}_4$ does not have a tetrahedral structure.Reason : $\text{Se}$ in ${\text{SeCl}}_4$ has two lone pairs.

Which of the following species contains three bond pairs and one lone pair around the central atom?

Which one of the following is a mineral of iron?

Identify the alloy containing a non-metal as a constituent in it.

Which one of the following pairs is isostructural (i.e., having the same shape and hybridization)?

In which of the following compounds, nitrogen exhibits highest oxidation state?

Bond order of 1.5 is shown by:

A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number?

Which of the following statements is NOT valid for oxoacids of phosphorus?

The pair of species with the same bond order is:

In the extraction of copper from its sulphide ore, the metal is finally obtained by the reduction of cuprous oxide with:

Aluminium is extracted from alumina (${\text{Al}}_2{\text{O}}_3$) by electrolysis of a molten mixture of: