List of top Chemistry Questions

What is Insulin chemically?
How much water must be added to 500 mL of 2 M $ \mathrm{H_2SO_4} $ solution to make it 0.5 M?
Give the reason for low concentration of oxygen in the blood and tissues of people living at high altitude.
The rate constant for a first-order reaction is \( 0.0693 \, \text{min}^{-1} \). What is the half-life of the reaction?
What volume of oxygen gas at STP is required to completely burn 12 g of methane (\( \text{CH}_4 \))? (Molar mass of \( \text{CH}_4 = 16 \, \text{g/mol} \), 1 mole of gas at STP occupies \( 22.4 \, \text{L} \)).
What is the molar mass of NaCl?
Which of the following compounds will give a positive Iodoform test?

Calculate the number of moles present in 9.10 × 1016 kg of water.

Which of the following gases has the lowest solubility in water at 298 K?
Hardness of water is estimated by titration with
The product obtained on ozonolysis of 3-Ethylpent-2-ene are
The percentage of Cr(III) in Ruby is
The correct order of ionization enthalpy is
An aromatic compound (X) of molecular formula, C7H7Cl, on ammonolysis gives Y (Molecular formula, C7H9N). The compound Y reacts with two moles of CH3Cl gives N, N-Dimethylphenylmethanamine. The compounds 'X' and 'Y' are
The bond angle of Cr-O-Cr bond in dichromate ion is
The first and second ionization enthalpies of lanthanoids are comparable with the element
Which of the following transition elements has both bcc and ccp structures at normal temperature?
The carbohydrates are stored in animal body as
The increasing order of atomic radii is
Which of the following is not a chiral molecule?
In a reaction, \( 3A \rightarrow \text{Products} \), the concentration of \( A \) decreases from 0.6 mol L\(^{-1}\) to 0.3 mol L\(^{-1}\) in 20 minutes. What is the rate of the reaction during this interval?
The number of moles of alkyl halides required to convert primary amine into quaternary ammonium salt is
Which of the following molecules has an expanded octet?
The product obtained on the reaction of propanone with \( CH_3MgBr \) followed by hydrolysis is
When benzene is treated with carbon monoxide and hydrogen chloride in the presence of anhydrous aluminium chloride, benzaldehyde is formed. The reaction is known as