19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
For the chemical equilibrium, CaCO (s) CaO(s) CO (g) , Hº can be determined from which one of the following graphs ? (a) (b) (c) (d)
If for the heterogeneous equilibrium CaCO3(s) CaO(s) + CO2 (g) ; K = 1 at 1 atm, the temperature is given by : (a) Sº T Hº (b) Hº T Sº (c) Gº T R (d) Gº T Hº
In reversible reaction k k A B , the initial concentration of A and B are a and b in moles per litre and the equilibrium concentration are (a – x) and (b + x) respectively ; express x in terms of k1, k2, a and b. (a…
Au(s) Au(l) Above equilibrium is favoured at
For the reaction : N (g) O (g) NO(g) If pressure is increased by reducing the volume of the container, then
For the all gas reaction at 1000 K : 2HI H2 + I2, K = 0.0344. If you were to begin with 8.0 M of HI in a fixed volume container, what would be the equilibrium concentration of H2 ?
Consider the reaction NaBr(aq) + H2SO4(aq) NaHSO4(aq) + HBr(aq). The equilibrium constant is 8.3 × 10 –2. If the equilibrium concentrations of NaBr, H2SO4 and NaHSO4 are 6.0 M, 9.0 M and 3.0 M respectively, what is th…
When A2 and B2 are allowed to react, the equilibrium constant of the reaction at 27ºC is found (Kc = 4). A2(g) + B2(g) 2AB(g) What will be the equilibrium concentration of AB ?
I I I This reaction is set-up in aqueous medium. We start with 1 mol of I2 and 0.5 mol of I– in 1L flask. After equilibrium is reached, excess of AgNO3 gave 0.25 mol of yellow ppt. Equilibrium constant is : [Given…
N2O4 2NO2, Kc = 4. This reversible reaction is studied graphically as shown in the given figure. Select the correct statement out of I, II and III. I : Reaction quotient has maximum value at point A II : Reaction proc…
N2(g) + 3H2(g) 2NH3(g) Initially the molar ratio of N2 and H2 was 1 : 3. At equilibrium, 50% of each has reacted. If the equilibrium pressure is P, the partial pressure of NH3 at equilibrium is:
Given : Reaction Equilibrium constant N2(g) + 3H2(g) 2NH3(g) K1 N2(g) + O2(g) 2NO(g) K2 H (g) O (g) H O(g) K3 The equilibrium constant K4 for the following reaction 2NH (g) O (g) 2NO(g) 3H …
If standard heat of dissociation of PCl5 is 230 cal, then slope of the graph of log k vs 1 T is
Given the correct order of initials T or F for the following statements. Use T if statements is true and F if it is false: (I) CH P CF is non-polar and CH P CF is polar molecule (II) CH P CH bond angles a…
The compound MX is tetrahedral. The number of XMX angles in the compound is:
Which of the following compounds have the same no. of lone pairs with their central atom? (I) XeF (II) BrF (III) XeF (IV) H S (V) Triple Methylene
Which molecule has regular geometry? (I) SnCl (II) NH (III) PCl (IV) SF
Given the correct order of initials T or F for the following statements. Use T is statement is true and F if it is false: (I) The order of repulsion between different pair of electrons is LP – LP > LP –BP > BP – BP (I…
Which molecular geometry is least likely to result from a trigonal bipyramidal electron geometry?
The dipole moment of o, p and m-dichlorobenzene will be in the order :
Which has a maximum dipole moment? (a) (b) (c) (d)
Which of the following substances has the least covalent character?
Which of the following substances has the least covalent character?
Which has a maximum dipole moment? (a) (b) (c) (d)
The dipole moment of o, p and m-dichlorobenzene will be in the order :