Chemistry questions
29404 published questions with worked solutions.
- Consider a complex reaction taking place in three steps with rate constants k_1, k_2 and k_3 respectively. The overall rate...
- The incorrect decreasing order of atomic radii is :
- Statement I : In the oxalic acid vs KMnO_4 (in the presence of dil H_2SO_4) titration the solution needs to be heated initially...
- Match the List-I with List-II List-I (Redox Reaction): (A) CH_4(g) + 2O_2(g) CO_2(g) + 2H_2O(l) (B) 2NaH(s) 2Na(s) + H_2(g) (C)...
- A weak acid HA has degree of dissociation x. Which option gives the correct expression of pH – pK_a) ?
- Consider "n" is the number of lone pair of electrons present in the equatorial position of the most stable structure of ClF_3....
- The metal ion whose electronic configuration is not affected by the nature of the ligand and which gives a violet colour in...
- In a multielectron atom, which of the following orbitals described by three quantum numbers with have same energy in absence of...
- Consider the following elements In, Tl, Al, Pb, Sn and Ge. The most stable oxidation states of elements with highest and lowest...
- Which of the following oxidation reactions are carried out by both K_2Cr_2O_7 and KMnO_4 in acidic medium ? A. I^- I_2 B. S^ 2- S...
- Statement I : D-glucose pentaacetate reacts with 2, 4-dinitrophenylhydrazine. Statement II : Starch, on heating with concentrated...
- Quantitative analysis of an organic compound (X) shows following % composition. C : 14.5%; Cl : 64.46%; H : 1.8% (Empirical...
- The molarity of a 70% (mass/mass) aqueous solution of a monobasic acid (X) is _______× 10^ -1 M(Nearest integer) [Given : Density...
- The formation enthalpies, H_f^ for H_ (g) and O_ (g) are 220.0 and 250.0 kJ mol^ -1 , respectively, at 298.15 K, and H_f^ for...
- Consider the elementary reaction A(g) + B(g) → C(g) + D(g). If the volume of reaction mixture is suddenly reduced to 1 3 of its...
- The amphoteric oxide among V_2O_3, V_2O_4 and V_2O_5 upon reaction with alkali leads to formation of an oxide anion. The...
- Match List-I with List-II List-I (Saccharides): (A) Sucrose (B) Maltose (C) Lactose (D) Amylopectin List-II (Glycosidic-linkages...
- Identify product [A], [B] and [C] in the following reaction sequence : CH_3-C CH Pd/c, H_2 A (i)O_3 (ii)Zn,H_2O [B]+[C]
- Arrange the following in increasing order of solubility product : Ca(OH)2, AgBr, PbS, HgS
- The purification method based on the following physical transformation is : Solid (X) Heat Vapour (X) Cool Solid (X)