The density of 3M solution of sodium chloride is 1.252 g mL$$^{-1}$$. The molality of the solution will be : (molar mass, NaCl = 58.5 g mol$$^{-1}$$)
JEE WhatsApp Group
Sign in
Please select an account to continue using cracku.in
↓ →
JEE WhatsApp Group
Join Our JEE Preparation Group
Prep with like-minded aspirants; Get access to free daily tests and study material.
The density of 3M solution of sodium chloride is 1.252 g mL$$^{-1}$$. The molality of the solution will be : (molar mass, NaCl = 58.5 g mol$$^{-1}$$)
Login to view the detailed solution.
The wave number of the first emission line in the Balmer series of H-Spectrum is : (R = Rydberg constant)
Login to view the detailed solution.
The order of increasing sizes of atomic radii among the elements O, S, Se and As is :
Login to view the detailed solution.
.webp)
The solubility order for alkali metal fluoride in water is :
Login to view the detailed solution.
Bond order normally gives idea of stability of a molecular species. All the molecules viz. $$H_2$$, $$Li_2$$ and $$B_2$$ have the same bond order yet they are not equally stable. Their stability order is :
Login to view the detailed solution.
Given Reaction Energy Change (in kJ):
Li(s) $$\rightarrow$$ Li(g) : 161
Li(g) $$\rightarrow$$ Li$$^+$$(g) : 520
$$\frac{1}{2}F_2(g) \rightarrow$$ F(g) : 77
F(g) + e$$^-$$ $$\rightarrow$$ F$$^-$$(g) : (Electron gain enthalpy)
Li$$^+$$(g) + F$$^-$$(g) $$\rightarrow$$ LiF(s) : -1047
Li(s) + $$\frac{1}{2}F_2$$(g) $$\rightarrow$$ LiF(s) : -617
Based on data provided, the value of electron gain enthalpy of fluorine would be :
Login to view the detailed solution.
.webp)
The reaction X $$\rightarrow$$ Y is an exothermic reaction. Activation energy of the reaction for X into Y is 150 kJ mol$$^{-1}$$. Enthalpy of reaction is 135 kJ mol$$^{-1}$$. The activation energy for the reverse reaction, Y $$\rightarrow$$ X will be :
Login to view the detailed solution.
Which one of the following arrangements represents the correct order of solubilities of sparingly soluble salts $$Hg_2Cl_2$$, $$Cr_2(SO_4)_3$$, $$BaSO_4$$ and $$CrCl_3$$ respectively?
Login to view the detailed solution.
NaOH is a strong base. What will be pH of $$5.0 \times 10^{-2}$$ M NaOH solution? (log 2 = 0.3)
Login to view the detailed solution.
.webp)
Values of dissociation constant, $$K_a$$ are given as follows :
Acid $$K_a$$
HCN $$6.2 \times 10^{-10}$$
HF $$7.2 \times 10^{-4}$$
HNO$$_2$$ $$4.0 \times 10^{-4}$$
Correct order of increasing base strength of $$CN^-$$, $$F^-$$ and $$NO_2^-$$ will be :
Login to view the detailed solution.
For which of the following compounds Kjeldahl method can be used to determine the percentage of Nitrogen?
Login to view the detailed solution.
Arrange in the correct order of stability (decreasing order) for the following molecules: (I), (II), (III), (IV) - cyclohexane conformations
I.
II.
III.
IV.
Login to view the detailed solution.
.webp)
A major component of Borsch reagent is obtained by reacting hydrazine hydrate with which of the following?
Login to view the detailed solution.
Clemmensen reduction of a ketone is carried out in the presence of :
Login to view the detailed solution.
Which of the following would not give 2-phenylbutane as the major product in a Friedel-Crafts alkylation reaction?
Login to view the detailed solution.
Which one of the following statements about packing in solids is incorrect?
Login to view the detailed solution.
A molecule M associates in a given solvent according to the equation $$M \rightleftharpoons (M)_n$$. For a certain concentration of M, the van't Hoff factor was found to be 0.9 and the fraction of associated molecules was 0.2. The value of n is:
Login to view the detailed solution.
Flocculation value of $$BaCl_2$$ is much less than that of KCl for sol A and flocculation value of $$Na_2SO_4$$ is much less than that of NaBr for sol B. The correct statement among the following is :
Login to view the detailed solution.
_1.webp)
In Goldschmidt aluminothermic process which of the following reducing agents is used :
Login to view the detailed solution.
Oxidation state of sulphur in anions $$SO_4^{2-}$$, $$S_2O_4^{2-}$$ and $$S_2O_6^{2-}$$ increases in the orders :
Login to view the detailed solution.
XeO$$_4$$ molecule is tetrahedral having:
Login to view the detailed solution.
Which of the following is diamagnetic?
Login to view the detailed solution.
Which of the following statements is incorrect?
Login to view the detailed solution.
The Wurtz-Fittig reaction involves condensation of:
Login to view the detailed solution.
What is the structure of the major product when phenol is treated with bromine water?
Login to view the detailed solution.
Amongst the following alcohols which would react fastest with conc. HCl and ZnCl$$_2$$?
Login to view the detailed solution.
In Williamson synthesis of mixed ether having a primary and a tertiary alkyl group if tertiary halide is used, then :
Login to view the detailed solution.
The polymer used for optical lenses is :
Login to view the detailed solution.
Which of the following statements about aspirin is not true?
Login to view the detailed solution.
Which of the following structures represents thymine?
Login to view the detailed solution.
Educational materials for JEE preparation
Share