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JEE Mains | PYQ

When \(\psi_A\) and \( \psi_A \) are the wave functions of atomic orbitals, then \( \sigma^{*} \) is represented by:

Given below are \( 2 \) statements:
Statement (I): Kjeldahl method is applicable to estimate nitrogen in pyridine.
Statement (II): The nitrogen present in pyridine can easily be converted into ammonium sulphate in Kjeldahl method.
In the light of the above statements, choose the correct answer from the options given below:

Given are two statements:
Statement (I): Fusion of \( \mathrm{MnO_2} \) with \( \mathrm{KOH} \) and an oxidizing agent gives dark green \( \mathrm{K_2MnO_4} \).
Statement (II): Manganate ion electrolytic oxidation in alkaline medium gives permanganate ion.
In the light of the above statements, choose the correct answer from the options given below;

The shape of carbocation is:

The emf of cell is \( 0.83 \, \mathrm{V} \) at \( 298 \, \mathrm{K} \). It could be increased by:

In qualitative test for identification of presence of phosphorous, the compound is heated with an oxidizing agent. Which is further treated with nitric acid and ammonium molybdate respectively. The yellow coloured precipitate obtained is:

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:

IUPAC name of following hydrocarbon \( (X) \) is:

Given below are two statements:
Statement (I): All the following compounds react with \( p \)-toluenesulfonyl chloride.
                       \( \mathrm{C_6H_5NH_2} \)    \(( \mathrm{C_6H_5)_2NH} \)    \(( \mathrm{C_6H_5)_3N} \)
Statement (II): Their products in the above reaction are soluble in aqueous \( \mathrm{NaOH} \)
In the light of the above statements, choose the correct answer from the options given below:

Identify the correct statements about p-block elements and their compounds.
(A) Non metals have higher electronegativity then metals.
(B) Non metals have lower ionization enthalpy than metals.
(C) Compounds formed between highly reactive non-metals and highly reactive metals are generally ionic.
(D) The non-metal oxides are generally basic in nature.
(E) The metal oxides are generally acidic or neutral in nature.
Choose the correct answer from the option given below:

The equilibrium \( \mathrm{Cr_2O_7^{2-}} \rightleftharpoons 2\mathrm{CrO_4^{2-}} \) is shifted to the right in:

The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is:
\( \mathrm{CH_3CH_2COOH} \), \( \mathrm{CH_3COOH} \), \( \mathrm{CH_3CH_2CH_2COOH} \), \( \mathrm{HCOOH} \)

Given below are two statements :
Statement (I) : A Buffer solution is the mixture of a salt and an acid or a base mixed in any particular quantities.
Statement (II) : Blood is naturally occurring buffer solution whose pH is maintained by \( \mathrm{H_2CO_3} / \mathrm{HCO_3^\ominus} \) concentrations.
In the light of the above statements, choose the correct answer from the options given below ;

Given below are two statements :
Statement (I) : \( \mathrm{S}_{\mathrm{N}}2 \) reactions are ‘stereospecific’, indicating that they result in the formation of only one stereo-isomer as the product
Statement (II) : \( \mathrm{S}_{\mathrm{N}}1 \) reactions generally result in formation of product as racemic mixtures.
In the light of the above statements, choose the correct answer from the options given below

The reaction : \( \tfrac{1}{2}\mathrm{H_{2(g)}} + \mathrm{AgCl_{(s)}} \longrightarrow \mathrm{H^+_{(aq)}} + \mathrm{Cl^-_{(aq)}} + \mathrm{Ag_{(s)}} \)
Occurs in which of the following galvanic cell :

Identify the incorrect statements about group \( 15 \) elements :
(A) Dinitrogen is a diatomic gas which acts like an inert gas at room temperature.
(B) The common oxidation states of these elements are \( -3, +3 \) and \( +5 \).
(C) Nitrogen has unique ability to form \( p\pi - p\pi \) multiple bonds.
(D) The stability of \( +5 \) oxidation states increases down the group.
(E) Nitrogen shows a maximum covalency of \( 6 \).

Which one the following compounds will readily react with dilute \( \mathrm{NaOH} \) ?

Match List – I with List – II

Choose the correct answer from the options given below :

The total number of carbon atoms present in tyrosine, an amino acid, is _______________.

Number of molecules having bond order \( 2 \) from the following molecules is ______________. 
\( C_2, O_2, Be_2, Li_2, Ne_2, N_2, He_2 \).

Tow moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous \( \text{NaOH} \) after heating gives \( x \) as the major product. The number of \( \pi \) bonds in the product \( x \) is______________.

Wave number for a radiation having \( 5800 \mathring{\text{A}} \) wavelength is \( x \times 10 \, \text{cm}^{-1} \). The value of \( x \) is ____________.(Integer answer)

Total number of aromatic compound among the following compounds is ___________.

Molality of an aqueous solution of urea is \( 4.44 \, \text{m} \). Mole fraction of urea in solution is \( x \times 10^{-3} \). Value of \( x \) is _____________. (Integer answer)

Total number of unpaired elecrons in the complex ions \( [\mathrm{Co(NH_3)_6}]^{3+} \) and \( [\mathrm{NiCl_4}]^{2-} \) is:

A solution in prepared by adding \( 1 \) mole ethyl alcohol in \( 9 \) mole water. The mass precent of solute in the solution is ______ (Integer anser) (Given : Molar mass is \( \text{g mol}^{-1} \) Ethyl alcohol : \( 46 \), water : \( 18 \))

\( \Delta_{\text{vap}} H^{\ominus} \) for water is \( +40.79 \, \text{kJ mol}^{-1} \) at \( 1 \, \text{bar} \) and \( 100^{\circ} \text{C} \). Change in internal energy for this vapourisation under same condition is __________ \( \text{kJ mol}^{-1} \). (Integer answer)
 (Given \( R = 8.3 \, \text{J K}^{-1} \, \text{mol}^{-1} \))

Total number of optially active compounds from the following is _____________.