List of top Chemistry Questions

What volume of carbon dioxide is produced at STP when 5 litres of propane is burnt completely according to the equation given below?
[ C_3H_8 + 5O_2 3CO_2 + 4H_2O ]
The compound that has the highest melting point amongst the following is:
With respect to the electrolysis of copper (II) sulphate solution using copper electrodes, which statement is correct?
Following reaction takes place in one step :
\( 2A + B \rightarrow 2C \)
How will the rate of above reaction change if the volume of the reaction vessel is decreased to one third of its original volume? Will there be any change in the order of reaction with the reduced volume?
[Ni(PPh$_3$)$_2$Cl$_2$] is a paramagnetic complex. Identify the {INCORRECT statements about this complex. A. The complex exhibits geometrical isomerism.
B. The complex is white in colour.
C. The calculated spin-only magnetic moment of the complex is $2.84$ BM.
D. The calculated CFSE (Crystal Field Stabilization Energy) of Ni in this complex is $-0.8\Delta_o$.
E. The geometrical arrangement of ligands in this complex is similar to that in Ni(CO)$_4$.
Choose the correct answer from the options given below:
Complete the following:

1. Reactant: RCOCl
Reagent: H2 / Pd-BaSO4
Major Product: RCHO
Name of Reaction: Rosenmund Reduction

2. Reactant: CH3COOH
Reagent: Cl2 / Red P
Major Product: Cl-CH2COOH
Name of Reaction: HVZ Reaction

3. Reactant: CH3CHO
Reagent: Zn-Hg / conc. HCl
Major Product: CH3CH3
Name of Reaction: Clemmensen Reduction

(i)[Ni(CN)₄]²⁻ and [Ni(CO)(_4)] have different structures, but do not differ in their magnetic behaviour. Explain. 
(ii) Write the formula of Tetraamineaquachloridocobalt(III)chloride.

How do you prepare K₂Cr₂O₇ from chromite ore?

Give reasons for the following: 
(i) Zn, Cd and Hg are not considered transition elements. 
(ii) Transition metals form complex compounds. 
(iii) Sc(3+) is colourless, but Ti(3+) is coloured.

Briefly explain the electrochemical processes involved in the rusting of iron.
How will you convert nitrobenzene to 2, 4, 6-Tribromo aniline?
Give one chemical test to distinguish between formaldehyde and acetaldehyde.
How methanol is prepared industrially? Write the chemical equation.
In the electrolysis of molten NaCl, the substance liberated at the cathode is:
Which of the following is least reactive towards nucleophilic substitution (\( S_N1 \))?

(i) Explain Aldol condensation with example.
(ii) How are the following conversions achieved: 
(a) Benzene  Benzaldehyde, (b) Ethanoic acid  ethanol.

Why saline water is mixed with medicine before injected into the blood of a patient?
Which of the following is a polysaccharide?
Which of the following is a chelating ligand?
The half-life of a first-order reaction depends on:
The initial concentration of the first order reaction:

N2O5 (g) → 2NO2 (g) + 1/2 O2 (g)

was 1.24 × 10⁻² mol L⁻¹ at 300 K. The concentration of N2O5 after 60 minutes was 0.20 × 10⁻² mol L⁻¹.

Calculate the rate constant of the reaction at 300 K.
The standard electrode potential for Daniell cell is 1.1 V. Calculate the standard Gibbs energy change for the reaction:

Zn(s) + Cu2+(aq) → Zn2+(aq) + Cu(s)
Identify the products X and Y formed in the following reactions:

(i) CH3CH2OH + PCl5 → X + POCl3 + HCl

(ii) CH3Br + AgF → Y + AgBr

Give two differences between N1 and N2 reactions.

200 cm3 of an aqueous solution of a protein contains 1.26 g of the protein. The osmotic pressure of this solution at 300 K is found to be 2.57 × 10^-3 bar. Calculate the molar mass of the protein.

Given: R = 0.083 L bar mol^-1 K^-1