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JEE Mains | PYQ

Identify the incorrect statement for \( \mathrm{PCl_5} \) from the following.

Statement I : Leaching of gold with cyanide ion in absence of air/\( \mathrm{O_2} \) leads to cyano complex of \( \mathrm{Au(III)} \).
Statement II : Zinc is oxidized during the displacement reaction carried out for gold extraction.
In the light of the above statements, choose the correct answer from the options given below.

The correct order of increasing intermolecular hydrogen bond strength is

The correct order of increasing ionic radii is

The gas produced by treating an aqueous solution of ammonium chloride with sodium nitrite is

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : Flourine forms one oxoacid.
Reason R : Flourine has smallest size amongst all halogens and is highly electronegative.
In the light of the above statements, choose the most appropriate answer from the options given below.

In \( 3d \) series, the metal having the highest \( M^{2+} / M \) standard electrode potential is

The \( f \) orbitals are half and completely filled, respectively in lanthanide ions
[Given : Atomic no. Eu, \( 63 \); Sm, \( 62 \); Tm, \( 69 \); Tb, \( 65 \); Yb, \( 70 \); Dy, \( 66 \)]

Arrange the following coordination compounds in the increasing order of magnetic moments. (Atomic numbers: \( \mathrm{Mn} = 25 \); \( \mathrm{Fe} = 26 \))
A. \( [\mathrm{FeF}_{6}]^{3-} \)
B. \( [\mathrm{Fe(CN)}_{6}]^{3-} \)
C. \( [\mathrm{MnCl}_{6}]^{3-} \) (high spin)
D. \( [\mathrm{Mn(CN)}_{6}]^{3-} \)
Choose the correct answer from the options given below:

On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrate gives A and B while its reaction with HCl produces B and C. A, B and C are, respectively.

Which of the following is most stable?

What will be the major product of following sequence of reactions?

Product ‘A’ of following sequence of reactions is

Match List-I with List-II.

Choose the correct answer from the options given below:

Decarboxylation of all six possible forms of diaminobenzoic acids \( \mathrm{C_6H_3(NH_2)_2COOH} \) yields three products A, B and C. Three acids gives a product ‘A’, two acids gives a product ‘B’ and one acid give a product ‘C’. The melting point of product ‘C’ is

Which is true about Buna-N?

Given below are two statements.
Statement I : Maltose has two \( \alpha \)- D-glucose units linked at \( C_1 \) and \( C_4 \) and is a reducing sugar.
Statement II: Maltose has two monosaccharides; \( \alpha \)- D-glucose and \( \beta \)- D-glucose linked at \( C_1 \) and \( C_6 \) and it is a non-reducing sugar.
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:

Match List I with List II.

Choose the correct answer from the options given below:

\( 116 \, \text{g} \) of a substance upon dissociation reaction, yields \( 7.5 \, \text{g} \) of hydrogen, \( 60 \, \text{g} \) of oxygen and \( 48.5 \, \text{g} \) of carbon. Given that the atomic masses of \( \mathrm{H} \), \( \mathrm{O} \) and \( \mathrm{C} \) are \( 1 \), \( 16 \) and \( 12 \), respectively. The data agrees with how many formulae of the following? __________.
A. \( \mathrm{CH_3COOH} \)    B. \( \mathrm{HCHO} \)    C. \( \mathrm{CH_3OOCH_3} \)    D. \( \mathrm{CH_3CHO} \)

Consider the following set of quantum numbers.

The number of correct sets of quantum numbers is ________.

BeO reacts with HF in presence of ammonia to give [A] which on thermal decomposition produces [B] and ammonium fluoride. Oxidation state of be in [A] is ______.

When \( 5 \) moles of He gas expand isothermally and reversibly at \( 300 \, \mathrm{K} \) from \( 10 \, \text{litre} \) to \( 20 \, \text{litre} \), the magnitude of the maximum work obtained is ________ \( \mathrm{J} \).
[nearest integer] (Given : \( R = 8.3 \, \mathrm{J\,K^{-1}\,mol^{-1}} \) and \( \log 2 = 0.3010 \) )

A solution containing \( 2.5 \times 10^{-3} \, \mathrm{kg} \) of a solute dissolved in \( 75 \times 10^{-3} \, \mathrm{kg} \) of water boils at \( 373..535 \, \mathrm{K} \). The molar mass of the solute is _______ \( \mathrm{g\,mol^{-1}} \). [nearest integer]
\( \left( \text{Given : } K_b\,(\mathrm{H_2O}) = 0.52 \, \mathrm{K\,mol^{-1}} \text{ and boiling point of water } = 373.15 \, \mathrm{K} \right) \)

pH value of \( 0.001 \, \mathrm{M} \) NaOH solution is ______.

For the reaction taking place in the cell: 
$\text{Pt(s)} | \text{H}_2\text{(g)} | \text{H}^+\text{(aq)} || \text{Ag}^+\text{(aq)} | \text{Ag(s)}$

$E^0_{\text{cell}} = +0.5332\text{ V}$.
The value of $\Delta_f G^0$ is _________ $\text{kJ mol}^{-1}$. (in nearest integer)

It has been found that for a chemical reaction with rise in temperature by \( 9 \, \mathrm{K} \) the rate constant gets doubled.
Assuming a reaction to be occurring at \( 300 \, \mathrm{K} \), the value of activation energy is found to be _______ \( \mathrm{kJ\,mol^{-1}} \). [nearest integer]
(Given \( \ln 10 = 2.3 \), \( R = 8.3 \, \mathrm{J\,K^{-1}\,mol^{-1}} \) and \( \log 2 = 0.30 \) )

If the initial pressure of a gas is \( 0.03 \, \mathrm{atm} \), the mass of the gas adsorbed per gram of the adsorbent is ______ \( \times 10^{-2} \, \mathrm{g} \).

\( 0.25 \, \text{g} \) of an organic compound containing chlorine gave \( 0.40 \, \text{g} \) of silver chloride in Carius estimation. The percentage of chlorine present in the compound is ______. [in nearest integer]
(Given: Molar mass of \( \text{Ag} \) is \( 108 \, \text{g mol}^{-1} \) and that of \( \text{Cl} \) is \( 35.5 \, \text{g mol}^{-1} \) )