List of top Chemistry Questions

Which of the following does not evolve \( O_2 \) when made to react with water?
Observe the following reaction: \[ xI^- + y \, \, MnO_4^- + z \, H^+ \rightarrow a \, Mn^{2+} + b \, H_2O + cl_2 \] Which of the following are correct? (i) \( y : x = 2 : 5 \)
(ii) \( y : a = 1 : 1 \)
(iii) \( x : c = 1 : 2 \)
(iv) \( y : e = 2 : 5 \)

Which of the following are inner orbital paramagnetic complexes? 

The number average molecular weight (M\(_n\)) of a polymer is 1500. In this polymer, 800 molecules of molar mass 1000, 100 molecules of molar mass 2000 and x molecules of molar mass 5000 are present. What is the value of x?
Phosphodiester linkage that joins nucleotides together is present between which carbons of pentose sugar?
Which of the following is used in liquid detergents?
Given below are the two statements regarding chlorobenzene
Statement I: Chlorobenzene is less reactive than benzene towards electrophilic substitution due to the -I effect of chlorine.
Statement II: Because of the -I effect of chlorine, it is a meta directing group.
Which of the following sequence of reagents convert benzaldehyde to 4-chlorotoluene?

Phenatole can be prepared from which of the following reactants?

Identify 'Z' in the following sequence of reactions: 

In the following reaction sequence, what are X and Y respectively? 

 

Which of the following is correct statement?
An alkene ‘X’ (C\(_4\)H\(_8\)) does not exhibit cis/trans isomerism. Reaction of ‘X’ with Br\(_2\)/CCL\(_4\), followed by reaction with reagent ‘Y’ gave ‘Z’ (C\(_6\)H\(_6\)). What are ‘Y’ and ‘Z’ respectively?
In Ostwald process of manufacture of nitric acid, 12 moles of NH3 was completely oxidized in air by a catalyst at 500 K and 9 bar. The resultant NO(g) was completely oxidized to NO2(g) and dissolved in water to form nitric acid and NO(g). What is the weight (in g) of nitric acid formed?
The correct order of reducing power of alkali metals in aqueous solution is
Observe the following two statements: I. For an isolated system, \( \Delta U = 0 \); \( q = 0 \) II. For a closed system, \( \Delta U = 0 \); \( q \neq 0 \) The correct answer is
Two statements are given below: I. Sodium hexametaphosphate is used in calgon method for removal of permanent hardness of water II. Lithium forms interstitial hydrides Identify the correct answer
Electromagnetic radiation has electric and magnetic field components. These two components:
The first ionization enthalpies of the elements X, Y, Z of the second period are 899, 1402, 520 kJ/mol respectively. X, Y, Z respectively are:
Among the following, the incorrect statement about chloramphenicol is:
An alcohol X (C\(_5\)H\(_{12}\)O) when reacted with conc. HCl and anhydrous ZnCl\(_2\), produces turbidity instantly. The alcohol X can be prepared from which of the following reactions?
The correct statements of the following are: A) Aniline forms a stable benzene diazonium chloride at 285K.
B) N - Phenylethanamide is less reactive towards nitration than aniline.
C) p - CH\(_3\)C\(_6\)H\(_4\)COCl is Hinsberg reagent.
The reagents/ chemicals X and Y that convert cyanobenzene to Schiff's base are
Identify the set which is not correctly matched in the following:
Which of the following when subjected to thermal decomposition will liberate dinitrogen? (i) sodium nitrate (ii) ammonium dichromate (iii) barium azide