When diethyl ether is heated with excess of HI, it produces

Mark the correct order of decreasing acid strength of the following compounds.

Which set of ions exhibit specific colours? (Atomic number of Sc = 202121, Ti = 22, V = 23, Mn 25, Fe 26, Ni=28, Cu=29 and Zn = 30)

The stability of Mn²⁺, Fe²⁺,Cr²⁺, Co²⁺ is in order of (At o. of Mn = 25, Fe = 26, Cr = 24, Co = 27)

The equilibrium constant of the following reaction at 298 K is 1 x 10⁸ for
2Fe³⁺(aq) + 2I^-(aq) \(\rightleftharpoons\) 2Fe²⁺(aq) + I₂
\(\mathrm{E}_{\mathrm{I}_{2} \mid \mathrm{I}^{-}}^{\circ}=+0.54 \mathrm{~V} \quad \mathrm{E}_{\mathrm{Fe}^{3+} \mid \mathrm{Fe}}^{\circ}=?\) 

In the second transition series, the largest number of oxidation states are shown by

In chromite ore, the oxidation number of iron and chromium are respectively

2-Methyl-2-propanol may be prepared by reacting methylmagnesium iodide with

Phenol, when it first reacts with concentrated sulphuric acid and then with concentrated nitric acid, gives

The correct order of basic strength is

The order of reactivity of the alkenes,(CH₃)₂C = CH₂,CH₃CH = CH₂,CH₂ = CH₂

When acidified K₂Cr₂O₇ solution is added to Sn²⁺ salts, then Sn²⁺ changes to

Rust is a mixture of

A device that converts energy of combustion of fuels like hydrogen and methane directly into electrical energy is known as

Zn gives H₂ gas with H₂SO₄ and HCl but not with HNO₃ because

Standard electrode potentials are
Fe²⁺/Fe           E⁰ = - 0.44 V
Fe³⁺/Fe²⁺      E⁰ = + 0.77 V
Fe²⁺, Fe³⁺ and Fe blocks are kept together, then

Which has maximum potential for the half cell reaction : \(2{ H }^{ + }+2{ e }^{ - }\longrightarrow { H }_{ 2 }\) ?

The maximum oxidation state of osmium is

Which of the following statement is not correct about an inert electrode in a cell ?

Which of the following solution has highest equivalent conductance ?

Assertion: Pure iron is not used for making tools and machines.
Reason: Pure iron is hard.
Codes:
a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
c) Assertion is not true but the reason is true.
d) Both assertion and reason are false.

Assertion: Cuprous ion (Cu⁺)has unpaired electrons while cupric ion (Cu⁺⁺) does not
Reason: Cuprous ion (Cu⁺) is colourless whereas cupric ion (Cu⁺⁺) is blue in the aqueous solution
Codes:
a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
c) Assertion is not true but the reason is true.
d) Both assertion and reason are false.

Assertion: Transition metals show variable valence.
Reason: Due to a large energy difference between the ns² and (n-1)d electrons.
Codes:
a) Both assertion and reason are true, and the reason is the correct explanation of the assertion.
b) Both assertion and reason are true but the reason is not the correct explanation of assertion.
c) Assertion is not true but the reason is true.
d) Both assertion and reason are false.

Assertion: p-nitrophenol is more acidic than phenol.
Reason: Nitro group helps in the stabilisation of the phenoxide ion by dispersal of negative charge due to resonance.
Codes:
A) Assertion and reason both are correct and reason is correct explanation of assertion.
B) Both assertion and reason are correct statements but reason is not correct explanation of assertion.
C) Assertion is correct statement but reason is wrong statement.
D) Assertion is wrong statement but reason is correct statement.

Assertion : Ethers behave as bases in the presence of mineral acids.
Reason : Due to the presence of lone pairs of electrons on oxygen.
Codes:
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Assertion : Phenol is more reactive than benzene towards electrophilic substitution reaction.
Reason : In the case of phenol, the intermediate carbocation is more resonance stabilized.
Codes:
(a) If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
(b) If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
(c) If the Assertion is correct but Reason is incorrect.
(d) If both the Assertion and Reason are incorrect.

Assertion: Copper reacts with hydrochloric acid and liberates hydrogen from the solution of dilute hydrochloric acid.
Reason: Hydrogen is below copper in the electrochemical series.
Codes:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.

Assertion: Equivalent conductance of all electrolytes decreases with the increases in concentration.
Reason: Lesser number of ions are available per gram equivalent at higher concentration.
Codes:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.   

Assertion: In electrolysis, the quantity of electricity needed for depositing 1 mole of silver is different from that required for 1 mole of copper.
Reason: The molecular weights of silver and copper are different
Codes:
A) If both assertion and reason are true and the reason is the correct explanation of the assertion.
B) If both assertion and reason are true but reason is not the correct explanation of the assertion.
C) If assertion is true but reason is false.
D) If the assertion and reason both are false.
E) If assertion is false but reason is true.

Assertion (A) IUPAC name of the compound

Reason (R) In IUPAC nomenclature, ether is regarded as hydrocarbon derivative in which a hydrogen atom is replaced by -OR or -OAr group [where, R = alkyl group and Ar = aryl group].
(a) Both (A) and (R) are correct, (R) is the correct explanation of (A).
(b) Both (A) and (R) are correct, (R) is not the correct explanation of (A).
(c) (A) is correct; (R) is incorrect.
(d) (A) is incorrect; (R) is correct.

Assertion (A) : Copper is a non-transition element. 
Reason (R) : Copper has completely filled d-otrbitals in its ground state.
(a) Both (A) and (R) are correct, (R) is the correct explanation of (A).
(b) Both (A) and (R) are correct, (R) is not the correct explanation of (A).
(c) (A) is correct; (R) is incorrect.
(d) (A) is incorrect; (R) is correct

Assertion: A_m for weak electrolytes shows a sharp increase when the electrolytic solution is diluted.
Reason: For weak electrolytes degree of dissociation increases with dilution of solution.
codes :
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

Assertion: E_Cell should have a positive value for the cell to function.
Reason: E_cathode  <  E_anode
codes :
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

Assertion: Primary and secondary alcohols can be distinguished by Victor-Meyers test.
Reason: Primary alcohols form nitrolic acid which dissolves in NaOH to form blood red colouration but secondary alcohols. form pseudonitrols which give blue colouration with NaOH.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

Assertion: o-Nitrophenol is more volatile than p-nitrophenol.
Reason: Intramolecular hydrogen bonding is present in o-nitrophenol while intermolecular H-bonding is in p-nitrophenol.
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

Assertion : Auric chloride (AuCI₃ ) solution cannot be stored in a vessel made of copper, iron, nickel, chromium, zinc or tin. Reason: Gold is a very precious metal.
Reason : Gold is a very precious metal.
Codes :
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

Assertion : The observed conductance depends upon the nature of the electrolyte and the concentration of the solution.
Reason : The cell constant of a cell depends upon the nature of the material of the electrodes.
Codes :
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.

Assertion: Fe³⁺ is more stable than Fe²⁺.
Reason: Fe²⁺ ions are easily oxidised to Fe³⁺ ions
Codes:
(a) Assertion and reason both are correct statements and reason is correct explanation for assertion.
(b) Assertion and reason both are correct statements but reason is not correct explanation for assertion.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement

In the following questions an Assertion (A) is followed by a corresponding Reason (R) Use the following keys to choose the appropriate answer.
Assertion (A) La(OH)₂ is more basic than La(OH)₃.
Reason (R) The basic character of oxides and hydroxides decrease from La(OH)₂ to La(OH)₃.
Codes:
(a) Both (A) and (R) are correct, (R) is the correct explanation of (A).
(b) Both (A) and (R) are correct, (R) is not the correct explanation of (A).
(c) (A) is correct; (R) is incorrect.
(d) (A) is incorrect; (R) is correct.

In the following questions.an Assertion (A) is followed by a corresponding Reason (R) Use the following keys to choose the appropriate answer.
Assertion Pure water conducts electricity.
Reason Pure water exists in unionised form.
Codes:
(a) Both (A) and (R) are correct, (R) is the correct explanation of (A).
(b) Both (A) and (R) are correct, (R) is not the correct explanation of (A).
(c) (A) is correct; (R) is incorrect.
(d) (A) is incorrect; (R) is correct.