List of top Chemistry Questions

An unripe mango placed in a concentrated salt solution to prepare pickle, shrivels because __________
Give reasons:
(a) Cooking is faster in a pressure cooker than in an open pan.
(b) On mixing liquid X and liquid Y, volume of the resulting solution decreases. What type of deviation from Raoult's law is shown by the resulting solution? What change in temperature would you observe after mixing liquids X and Y?
Assertion (A): The boiling points of alkyl halides decrease in the order: RI > RBr > RCl > RF.
Reason (R): The boiling points of alkyl chlorides, bromides and iodides are considerably higher than that of the hydrocarbon of comparable molecular mass.
Assertion (A): All naturally occurring \(\alpha\)-amino acids except glycine are optically active.
Reason (R): Most naturally occurring amino acids have L-configuration.
Arrange the following compounds in increasing order of their boiling points: increasing order of their boiling points
The acid formed when propyl magnesium bromide is treated with CO$_2$ followed by acid hydrolysis is:
Alkyl halides undergoing nucleophilic bimolecular substitution reaction involve:
The best reagent for converting propanamide into propanamine is:
Which of the following statements is not true about glucose?
Which is the correct order of acid strength from the following?
In case of association, abnormal molar mass of solute will:
Acidified KMnO$_4$ oxidizes sulphite to:
Given below are two statements: 
Statement (I): Corrosion is an electrochemical phenomenon in which pure metal acts as an anode and impure metal as a cathode.
Statement (II): The rate of corrosion is more in alkaline medium than in acidic medium.
 In the light of the above statements, choose the correct answer from the options given below:

The molarity of a 70% (mass/mass) aqueous solution of a monobasic acid (X) is:

If \( a_0 \) is denoted as the Bohr radius of the hydrogen atom, then what is the de-Broglie wavelength \( \lambda \) of the electron present in the second orbit of hydrogen atom? (\( n \): any integer)
Match the Compounds (List- I) with the appropriate Catalyst/Reagents (List- II) for their reduction into corresponding amines.
Match the Compounds (List- I) with the appropriate Catalyst/Reagents (List- II) for their reduction into corresponding amines.
When sec-butylcyclohexane reacts with bromine in the presence of sunlight, the major product is:

Assume a living cell with 0.9% (\(w/w\)) of glucose solution (aqueous). This cell is immersed in another solution having equal mole fraction of glucose and water. (Consider the data up to first decimal place only) The cell will:

Consider the following data: 
- Heat of formation of \( CO_2(g) \) = -393.5 kJ mol\(^{-1}\) 
- Heat of formation of \( H_2O(l) \) = -286.0 kJ mol\(^{-1}\) 
- Heat of combustion of benzene = -3267.0 kJ mol\(^{-1}\) 
The heat of formation of benzene is ……… kJ mol\(^{-1}\) (Nearest integer).

The spin-only magnetic moment (\(\mu\)) value (B.M.) of the compound with the strongest oxidising power among \(Mn_2O_3\), \(TiO\), and \(VO\) is ……. B.M. (Nearest integer).

Concentrated nitric acid is labelled as 75% by mass. The volume in mL of the solution which contains 30 g of nitric acid is: 
Given: Density of nitric acid solution is 1.25 g/mL.

Arrange the following in increasing order of solubility product: 
\[ {Ca(OH)}_2, {AgBr}, {PbS}, {HgS} \]

Which of the following is/are correct with respect to the energy of atomic orbitals of a hydrogen atom? 
(A) \( 1s<2s<2p<3d<4s \) 
(B) \( 1s<2s = 2p<3s = 3p \) 
(C) \( 1s<2s<2p<3s<3p \) 
(D) \( 1s<2s<4s<3d \) 
Choose the correct answer from the options given below:

Match List - I with List - II. 
         List - I (Saccharides)     List - II (Glycosidic linkages found) 
         (A) Sucrose                     (I) \( \alpha 1 - 4 \)
         (B) Maltose                    (II) \( \alpha 1 - 4 \) and \( \alpha 1 - 6 \)
         (C) Lactose                     (III) \( \alpha 1 - \beta 2 \)
         (D) Amylopectin            (IV) \( \beta 1 - 4 \)

Choose the correct answer from the options given below:

Total number of molecules/species from the following which will be paramagnetic is ………. \[ O_2, O_2^+, O_2^-, NO, NO_2, CO, K_2[NiCl_4], [Co(NH_3)_6]Cl_3, K_2[Ni(CN)_4] \]