For the chemical reaction $N_2(g)+3H_2(g) \rightleftharpoons 2NH_3(g)$ the correct option is: (1) $-{1\over3}{d[H_2]\over dt}=- {1\over2} {d[NH_3]\over dt}$ (2) $-{d[N_2]\over dt}=2 {d[NH_3]\over dt}$ (3) $-{d[N_2]\over dt}={1\over2} {d[NH_3]\over dt}$ (4) ...
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber's process is : (1) 10 (2) 20 (3) 30 (4) 40
The compound that is most difficult to protonate is :
For an ideal solution, the correct option is : (1) $\Delta$mix S = 0 at constant T and P (2) $\Delta$mix V $\neq$ 0 at constant T and P (3) $\Delta$mix H = 0 at constant T and P (4) $\Delta$mix G = 0 at constant T and P
Conjugate base for Brönsted acids H2O and HF are : (1) OH– and H2F+, respectively (2) H3O+ and F–, respectively (3) OH– and F–, respectively (4) H3O+ and H2F+, respectively
Which mixture of the solutions will lead to the formation of negatively charged colloidal [Agl]l- sol. ? (1) 50 mL of 1 M AgNO3 + 50 mL of 1.5 M KI (2) 50 mL of 1 M AgNO3 + 50 mL of 2 M KI (3) 50 mL of 2 M AgNO3 + 50 mL of 1.5 M KI (4) 50 mL of 0.1 M AgNO3 ...
Among the following, the narrow spectrum antibiotic is : (1) Penicillin G (2) Ampicillin (3) Amoxycillin (4) Chloramphenicol
An alkene "A" on reaction with O3 and Zn–H2O gives propanone and ethanal in equimolar ratio. Addition of HCl to alkene "A" gives "B" as the major product. The structure of product "B" is:
What is the correct electronic configuration of the central atom in K4[Fe(CN)6] based on crystal field theory? (1) $t_{2g}^4 e_g^2$ (2) $t_{2g}^6 e_g^0$ (3) $e^3 t_2^3$ (4) $e^4 t_2^2$
Identify the incorrect statement related to PCl5 from the following: (1) Three equatorial P-Cl bonds make an angle of 120° with each other (2) Two axial P-Cl bonds make an angle of 180° with each other (3) Axial P-Cl bonds are longer than equatorial P-Cl ...
Which will make basic buffer? (1) 50 mL of 0.1 M NaOH + 25 mL of 0.1 M CH3COOH (2) 100 mL of 0.1 M CH3COOH + 100 mL of 0.1 M NaOH (3) 100 mL of 0.1 M HCl + 200 mL of 0.1 M NH4OH (4) 100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH
The major product of the following reaction is:
Match the Xenon compounds in Column-I with its structure in Column-II and assign the correct code: Column-I Column-II (a) XeF4 (i) pyramidal (b) XeF6 (ii) square planar (c) XeOF4 (iii)distorted octahedral (d) XeO3 (iv) square pyramidal Code: (a) (b) (c) (d)...
The manganate and permanganate ions are tetrahedral, due to : (1) The $\pi$-bonding involves overlap of p-orbitals of oxygen with d-orbitals of manganese (2) There is no $\pi$-bonding (3) The $\pi$-bonding involves overlap of p-orbitals of oxygen with p-...
Which of the following species is not stable? (1) [SiF6]2– (2) [GeCl6]2– (3) [Sn(OH)6]2– (4) [SiCl6]2–
For a cell involving one electron $E^o_{cell}$ = 0.59 V at 298 K, the equilibrium constant for the cell reaction is : $[{\text{Given That } {2.303 RT\over F}=0.059 V\text{ at }T=298K}]$ (1) 1.0 × 102 (2) 1.0 × 105 (3) 1.0 × 1010 (4) 1.0 × 1030
Which of the following is an amphoteric hydroxide? (1) Sr(OH)2 (2) Ca(OH)2 (3) Mg(OH)2 (4) Be(OH)2
A gas at 350 K and 15 bar has molar volume 20 percent smaller than that for an ideal gas under the same conditions. The correct option about the gas and its compressibility factor (Z) is : (1) Z > 1 and attractive forces are dominant (2) Z > 1 and repulsive...
A compound is formed by cation C and anion A. The anions form hexagonal close packed (hcp) lattice and the cations occupy 75% of octahedral voids. The formula of the compound is : (1) C2A3 (2) C3A2 (3) C3A4 (4) C4A3
In which case change in entropy is negative? (1) Evaporation of water (2) Expansion of a gas at constant temperature (3) Sublimation of solid to gas (4) 2H(g) $\to$ H2(g)
Which of the following series of transitions in the spectrum of hydrogen atom falls in visible region? (1) Lyman series (2) Balmer series (3) Paschen series (4) Brackett series
The method used to remove temporary hardness of water is : (1) Calgon's method (2) Clark's method (3) Ion-exchange method (4) Synthetic resins method
Which one is malachite from the following? (1) CuFeS2 (2) Cu(OH)2 (3) Fe3O4 (4) CuCO3.Cu(OH)2
The correct order of the basic strength of methyl substituted amines in aqueous solution is : (1) (CH3)2NH > CH3NH2 > (CH3)3N (2) (CH3)3N > CH3NH2 > (CH3)2NH (3) (CH3)3N > (CH3)2NH > CH3NH2 (4) CH3NH2 > (CH3)2NH > (CH3)3N
Among the following, the reaction that proceeds through an electrophilic substitution, is:
The non-essential amino acid among the following is: (1) valine (2) leucine (3) alanine (4) lysine
If the rate constant for a first order reaction is k, the time (t) required for the completion of 99% of the reaction is given by: (1) t = 0.693/k (2) t = 6.909/k (3) t = 4.606/k (4) t = 2.303/k
pH of a saturated solution of Ca(OH)2 is 9. The solubility product (Ksp) of Ca(OH)2 is: (1) 0.5 × 10–15 (2) 0.25 × 10–10 (3) 0.125 × 10–15 (4) 0.5 × 10–10
For the second period elements the correct increasing order of first ionisation enthalpy is: (1) Li < Be < B < C < N < O < F < Ne (2) Li < B < Be < C < O < N < F < Ne (3) Li < B < Be < C < N < O < F < Ne (4) Li < Be < B < C < O < N < F < Ne
Which of the following diatomic molecular species has only $\pi$ bonds according to Molecular Orbital Theory? (1) O2 (2) N2 (3) C2 (4) Be2
857 questions
429 answers
237 comments
17 users