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If the enthalpy of sublimation of Li is 155 kJ mol−1, enthalpy of dissociation of F2 is 150 kJ mol−1, ionization enthalpy of Li is 520 kJ mol−1, electron gain enthalpy of F is −313 kJ mol−1, standard enthalpy of formation of LiF is −594 kJ mol−1. The magnitude of lattice enthalpy of LiF is _____ kJ mol−1. (Nearest Integer)

If the enthalpy of sublimation of Li is 155 kJ mol−1 enthalpy of dissociation of F2 is 150 kJ mol−1 […]

Among the following oxides of 3d elements, the number of mixed oxides are _____. Ti2O3, V2O4, Cr2O3, Mn3O4, Fe3O4, Fe2O3, Co3O4

Among the following oxides of 3d elements the number of mixed oxides are Q. Among the following oxides of 3d

The mass of benzanilide obtained from the benzoylation reaction of 5.8 g of aniline, if yield of product is 82%, is _____ g (nearest integer). (Given molar mass in gmol−1 H : 1, C : 12, N : 14, O : 16)

The mass of benzanilide obtained from the benzoylation reaction of aniline is Q. The mass of benzanilide obtained from the

Consider the following electrochemical cell : Pt | O2(g) (1 bar) | HCl(aq) || M2+(aq, 1.0 M) | M(s) The pH above which, oxygen gas would start to evolve at anode is _____ (nearest integer). Given : E°M2+/M = 0.994 V E°O2/H2O = 1.23 V (standard)

Electrochemical cell oxygen evolution pH threshold JEE Main Q. Consider the following electrochemical cell : Pt | O2(g) (1 bar)

Given below are two statements : Statement I : Elements ‘X’ and ‘Y’ are the most and least electronegative elements, respectively among N, As, Sb and P. The nature of the oxides X2O3 and Y2O3 is acidic and amphoteric, respectively. Statement II : BCl3 is covalent in nature and gets hydrolysed in water. It produces [B(OH)4]− and [B(H2O)6]3+ in aqueous medium. In the light of the above statements, choose the correct answer from the options given below :

Elements electronegativity oxides nature and hydrolysis of BCl3 Q. Given below are two statements : Statement I : Elements ‘X’

A + 2B → AB2 36.0 g of ‘A’ (Molar mass : 60 g mol−1) and 56.0 g of ‘B’ (Molar mass : 80 g mol−1) are allowed to react. Which of the following statements are correct ? A. ‘A’ is the limiting reagent. B. 77.0 g of AB2 is formed. C. Molar mass of AB2 is 140 g mol−1. D. 15.0 g of A is left unreacted after the completion of reaction.

A plus 2B gives AB2 limiting reagent and mass calculation Q. A + 2B → AB2 36.0 g of ‘A’

At T(K), 100 g of 98% H2SO4 (w/w) aqueous solution is mixed with 100 g of 49% H2SO4 (w/w) aqueous solution. What is the mole fraction of H2SO4 in the resultant solution? (Given : Atomic mass H = 1u; S = 32u; O = 16u). (Assume that temperature after mixing remains constant)

At T(K), 100 g of 98% H2SO4 aqueous solution is mixed with 100 g of 49% H2SO4 aqueous solution Q.

Given below are two statements : Statement I : The first ionization enthalpy of Cr is lower than that of Mn. Statement II : The second and third ionization enthalpies of Cr are higher than those of Mn. In the light of the above statements, choose the correct answer from the options given below :

The first ionization enthalpy of Cr is lower than that of Mn and second and third ionization enthalpies of Cr

The energy of first (lowest) Balmer line of H atom is x J. The energy (in J) of second Balmer line of H atom is :

The energy of first (lowest) Balmer line of H atom is x J. The energy (in J) of second Balmer

When 1 g of compound (X) is subjected to Kjeldahl’s method for estimation of nitrogen, 15 mL 1 M H2SO4 was neutralized by ammonia evolved. The percentage of nitrogen in compound (X) is :

When 1 g of compound (X) is subjected to Kjeldahl’s method for estimation of nitrogen, 15 mL 1 M H2SO4

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