The equilibrium concentrations of the species in the reaction A+B$\to$C+D are 2, 3, 10 and 6 mol L^–1, respectively at 300 K. ΔGº for the reaction is (R = 2 cal/mol K)

The increasing order of electronegativity of the three elements O,F and Na is

The concept that atoms combine in small whole number ratio was proposed by

There are two radioactive substances A and B. Decay constant of B is two times that of A. Initially, both have equal number of nuclei. After n half lives of A, rate of disintegration of both are equal. The value of n is

The rate constant for the decomposition of hydrocarbons is 2.418 x 10^-5 s^-1 at 546 K. If the energy of activation is 179.9 kJ/mol, what will be the value of pre-exponential factor.

Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.

Give the IUPAC names of the following compounds:

(i)CH₃CH(Cl)CH(Br)CH₃

(ii)CHF₂CBrClF

(iii)ClCH₂C≡CCH₂Br

(iv)(CCl3)₃CCl

(v)CH₃C(p-ClC₆H₄)₂CH(Br)CH₃

(vi)(CH₃)₃CCH=CClC₆H₄I-p

Sodium enthanoate on heating with soda lime give ‘X’. Electrolysis of aqueous solution of sodium ethanoate gives ‘Y’, ‘X’ and ‘Y’ respectively are :

Molarity equation of a mixture of solutions of same substance is given by

A hydrocarbon has molecular formula C2H6. Which of the class of hydrocarbons cannot have this formula?

If a gas absorbs

200 J

of heat and expands by

500

^{3}

against a constant pressure of

2 \times 10^{5} N m^{- 2},

then the change in internal energy is:

Does the number of moles of reaction products increase, decrease or remain same when each of the following equilibria is subjected to a decrease in pressure by increasing the volume?

$PCl_5 (g) ⇋ PCl_3 (g) + Cl_2 (g)$
$CaO (s) + CO_2 (g) ⇋ CaCO_3 (s)$
$3Fe (s) + 4H_2O (g) ⇋ Fe_3O_4 (s) + 4H_2 (g)$

Given below are two statements, one is labelled as Assertion A and the other is labelled as Reason R
Assertion (A) : The order of a reaction can have fractional value.

Reason (R) : The order of a reaction cannot be written from balanced equation of a reaction.

In the light of the above statements, choose the correct answer from the options given below

The first ionization constant of H₂S is 9.1 × 10^–8. Calculate the concentration of HS^– ion in its 0.1M solution. How will this concentration be affected if the solution is 0.1M in HCl also? If the second dissociation constant of H₂S is 1.2 × 10^–13, calculate the concentration of S₂^– under both conditions.

Complete the given reaction. $2Mn^{2+} + 5(i) + 8H_2O \to 2 \,(ii) + 10\, M + 16\, H^+$

Depict the galvanic cell in which the reaction Zn(s) + 2Ag⁺(aq) → Zn²⁺(aq) + 2Ag(s) takes place. Further show:
(i) Which of the electrode is negatively charged?
(ii) The carriers of the current in the cell.
(iii) Individual reaction at each electrode.

The correct order of increasing

C - O

bond length of

C O, C O_{3}^{2 -}, C O_{2}

is:

The number of bridging $CO$ ligands and $Co-Co$ bonds in $Co_2(CO)_8$, respectively are: