List of top Chemistry Questions

The most effective coagulating agent for antimony sulphide sol is:

The plot of \( \log \frac{x}{m} \) (y-axis) and \( \log p(x) \) (x-axis) is a straight line inclined at an angle of 45°. When the intercept, \( K \) is 10 and pressure is 0.3 atm, the amount of solute in grams adsorbed per gram of adsorbent (log3 = 0.4771) is:

Identify the reaction in which oxygen is not one of the products.

Arrange the following in order of increasing number of unpaired electrons in them:

1. \([Fe(CN)_6]^{3-}\)
2. \([MnCl_6]^{3-}\)
3. \([FeF_6]^{3-}\)
4. \([Co(NH_3)_6]^{3+}\)

Identify the correctly matched pairs.

1. \(\mathrm{TiO_2}\) – Pigment industry
2. \(\mathrm{MnO_2}\) – Dry battery cells
3. \(\mathrm{Cu/Ni}\) alloy – UK 'copper' coins

In which of the following pairs the polymer is correctly matched with the forces possessed by them?
A. Neoprene —- Weak intermolecular forces
B. Terylene —- Hydrogen bonding
C. Polystyrene —- Very weak intermolecular forces
D. Polythelene —- Hydrogen bonding

In nucleoside, the base is attached to which position of the sugar molecule?

Hypothyroidism is due to
A. High level of iodine in the diet
B. Enlargement of thyroid gland
C. Low levels of iodine in the diet
D. Increased levels of thyroxine

Ortho-sulphobenzimide is used as:

Two statements are given below
Statement I: Chlorobenzene on nitration gives 1-chloro-4-nitrobenzene as major product
Statement II: Chlorobenzene undergoes nitration slowly than benzene
Identify the correct answer

In SN2 reaction, the carbon in the transition state is:

Which of the following has more pK\(_a\) value?

Vinegar and butter are the sources for which of the following carboxylic acids respectively?

Identify X, Y and Z in the following reactions sequence:

Which of the following produces nitrogen gas after the reaction with nitrous acid?

The number of following statements which are incorrect line emission

A drop of solution (Volume 0.05 mL) contains \( 3.0 \times 10^{-6} \) moles of H\(^+\) ions. If the rate constant of disappearance of H\(^+\) is \( 1.0 \times 10^{-7} \, \text{mol litre}^{-1} \text{sec}^{-1} \), how long will it take for H\(^+\) ions to disappear?

The correct order of atomic radii of B, Be, N and C is

Which of the following is the correct order of increasing number of lone pair of electrons on the ntral atom?

The vapors of 1 g of an element occupy 2.5625 L exerting a pressure of 0.5 atm at 1000 K. What is the molar mass (in $\text{g mol}^{-1}$) of the element? (Assume vapors follow ideal gas equation. Given $R = 0.082 \text{ L atm mol}^{-1} \text{K}^{-1}$)

A gas obeys Charles' law in the temperature range 0--500 K at a given pressure. Its volume changes to zero at temperature of