Class 11th

The gas phase reaction 2A(g) ? A?(g) At 400 K has ΔG° = +25.2 kJ mol?¹.
The equilibrium constant K? for this reaction is ________ *10?². (Round off to the nearest integer).
[ Use: R = 8.3 J mol?¹ K?¹, In10 = 2.3, log? 2 = 0.30, 1atm = 1 bar]
[antilog (-0.3) = 0.501]

An unsaturated hydrocarbon X on ozonolysis gives A. Compound A when warmed with ammonical silver nitrate forms a bright silver mirror along the sides of the test tube. The unsaturated hydrocarbon X is:

10.0 mL of Na?CO? solution is titrated against 0.2 M HCl solution.
The following titre values were obtained in 5 readings:
4.8 mL, 4.9 mL 5.0 mL, 5.0 mL and 5.0 mL
Based on these readings, and convention of titrimetric estimation the concentration of Na?CO? solution is ________ mM. (Round off to the nearest integer).

The number of species below that have two lone pairs of electrons in their central atom is ________. (Round off to the nearest integer).
SF?, BF?, ClF?, AsF?, PCl?, BrF?, XeF?, SF?

Identify the reagent(s) 'A' and condition(s) for the reaction

Kindly consider the following

'

FeX₂ and FeY₃ are known when x and y are:

The green house gas/es is (are) :
(A) Carbon dioxide
(B) Oxygen
(C) Water vapour
(D) Methane
Choose the most appropriate answer from the options given below:

Statement I: Sodium hydride can be used as an oxidizing agent.
Statement II: The lone pair of electrons on nitrogen in pyridine makes it basic.
Choose the CORRECT answer from the options given below:

The characteristics of elements X,Y and Z with atomic numbers, respectively, 33, 53, and 83 are: