List of top Chemistry Questions

Arrange the following in decreasing acidic strength.
decreasing acidic strength.
150 g of acetic acid was contaminated with 10.2 g ascorbic acid (C6H8O6) to lower down its freezing point by (x × 10–1)°C. The value of x is ______. (Nearest integer)
(Given : Kf = 3.9 K kg mol–1; molar mass of ascorbic acid = 176 g mol–1)
What is the major product of the following reaction?
major product of the following reaction
The disproportionation of MnO42- in acidic medium resulted in the formation of two manganese compounds A and B. If the oxidation state of Mn in B is smaller than that of A, then the spin-only magnetic moment (μ) value of B in BM is _______. (Nearest integer)
On complete combustion of 0.492 g of an organic compound containing C, H and O, 0.7938 g of CO2 and 0.4428 g of H2O was produced. The % composition of oxygen in the compound is _______.
The major product of the following reaction is
major product of the following reaction

Total number of relatively more stable isomer(s) possible for octahedral complex [Cu(en)2(SCN)2] wiil be ______.

The number of interhalogens from the following having square pyramidal structure is :CIF3, IF7, BrF5, BrF3, I2CI6, IF5, CIF, CIF5

For the given first order reaction A → B, the half-life of the reaction is 0.3010 min. The ratio of the initial concentration of reactant to the concentration of reactant at time 2.0 min will be equal to ______. (Nearest integer)

Ka for butyric acid (C3H7COOH) is 2 × 10–5. The pH of 0.2 M solution of butyric acid is ______× 10–1. (Nearest integer) (Given log2 = 0.30)

The number of paramagnetic species among the following is ____B2,Li2,C2,C-2, O22--,O2+ and He2+

On reaction with stronger oxidizing agent like KIO4, hydrogen peroxide oxidizes with the evolution of O2. The oxidation number of I in KIO4 changes to____.
Some drugs bind to a site other than the active site of an enzyme. This site is known as
The compound(s) that is(are) removed as slag during the extraction of copper is 
(A) CaO 
(B) FeO 
(C) Al2O3 
(D) ZnO 
(E) NiO 
Choose the correct answer from the options given below :

Match List-I with List-II List-I 

 List-IList-I i
ReactionCatalyst
\(4 NH _3( g )+5 O _2( g ) \rightarrow 4 NO ( g )+6 H _2 O ( g )\)NO(g)
\(N _2( g )+3 H _2( g ) \rightarrow 2 NH _3( g )\)H_2SO_4(l)
\(C _{12} H _{22} O _{11}( aq ) H _2 O (l) \rightarrow \text { (Glucose) }+ C _6 H _{12} O _6 C _6 H _{12} O _6\)Pt(s) 
\( SO _2( g )+ O _2( g ) \rightarrow 2 SO _3( g )\)Fe(s)

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Match List - I with List - II 
                                   List I                                                                                  List II
A \(N _2( g )+3 H _2( g ) \rightarrow 2 NH _3( g )\)                                                                   I \(Cu\)  
B \(CO ( g )+3 H _2( g ) \rightarrow CH _4( g )+ H _2 O ( g )\)                                      II \(Cu / ZnO - Cr _2 O _3\) 
C \(CO ( g )+ H _2( g ) \rightarrow HCHO ( g )\)                                               III \(Fe _x O _y+ K _2 O + Al _2 O _3\) 
D \(CO ( g )+2 H _2\) (g) \(\rightarrow CH _3 OH ( g )\)                                                             IV \(Ni\) 
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Match List - I with List - II 
List-I (Compound)                                              List-II (Shape)
A \(BrF _5\)                                                                    I bent 
B \(\left[ CrF _6\right]^{3-}\)                                                             II square pyramidal
C \(O _3\)                                                                     III trigonal bipyramidal 
D \(PCl _5\)                                                                    IV octahedral 
Choose the correct answer from the optionsgiven below :
Match List - I with List - II 
 

List-I (Processes/Reactions)

List-II (Catalyst)

A$2 SO _2( g )+ O _2( g ) \rightarrow 2 SO _3( g )$I$Fe ( s )$
B$4 NH _3( g )+5 O _2( g ) \rightarrow$$4 NO ( g )+6 H _2 O ( g )$II$Pt ( s )- Rh ( s )$
C$N _2( g )+3 H _2( g ) \rightarrow 2 NH _3( g )$III$V _2 O _5$
DVegetable oil $(l)+ H _2 \rightarrow$Vegetable ghee(sIV$Ni ( s )$

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Given two statements below: 
Statement I: In $Cl _2$ molecule the covalent radius is double of the atomic radius of chlorine. 
Statement II: Radius of anionic species is always greater than their parent atomic radius Choose the most appropriate answer from options given below:
Match List-I with List-II, match the gas evolved during each reaction:
 

List-I

List-II

(A)$\left( NH _4\right)_2 Cr _2 O _7 \xrightarrow{\Delta}$(I)$H _2$
(B)$KMnO _4+ HCl \rightarrow$(II)$N _2$
(C)$Al + NaOH + H _2 O \rightarrow$(III)$O _2$
(D)$NaNO _3 \xrightarrow{\Delta}$(IV)$Cl _2$

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Which reactant will give the following alcohol on reaction with one mole of phenyl magnesium bromide \(( PhMgBr )\) followed by acidic hydrolysis?
alcohol
Match List-I with List-II
 

List-I

List-II

(A)Cd(s)+2Ni(OH)3(s)→CdO(s)+2Ni(OH)2(s)+H2O(l)(I)Primary battery
(B)Zn(Hg)+HgO(s)→ZnO(s)+Hg(l)(II)Discharging of secondary battery
(C)2PbSO4(s)+2H2O(l)→Pb(s)+PbO2(s)+2H2SO4(aq)(III)Fuel cell
(D)2H2(g)+O2(g)→2H2O(l)(IV)Charging of
secondary battery

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Identify the correct statement for the below given transformation
Chemical transformation
Choose the correct option for the following reactions
Chemical Reaction
Statements about Enzyme Inhibitor Drugs are given below:
  1. There are Competitive and Noncompetitive inhibitor drugs
  2.  These can bind at the active sites and allosteric sites
  3.  Competitive Drugs are allosteric site blocking drugs
  4.  Non-competitive Drugs are active site blocking drugs 
Choose the correct answer from the options given below :