NEB Question Browser
Explore Class 12 Chemistry past and model questions by chapter, year, marks and question type.
440 questions found
Write down the chemical reactions occurring in Open-Hearth furnace.
Why is Spiegeleisen added in the Open-Hearth furnace?
Write down the composition of stainless steel.
Hydroboration oxidation
Decarbonylation
Sandmeyer's reaction
How does E react with nitrous acid?
How would you convert (B) into C₃H₈?
Identify (A), (B), (C), (D) and (E) with chemical reaction.
Define rate law.
What is meant by rate constant?
Difference between order and molecularity of a reaction
Calculate rate constant [k]
What is the concentration of NO₂ in the following first order reaction in which the rate is 2.4 × 10⁻⁵ mole L⁻¹ and rate constant is 3.0 × 10⁻⁵ s⁻¹?
2 NO₂ ⟶ 4 NO₂ + O₂
0.04
0.8
1.2
1.4
The solubility product of chalk is 9.3 × 10⁻⁸. What is its solubility in gram per liter?
3.04 × 10⁻¹
3.04 × 10⁻²
3.04 × 10⁻³
3.04 × 10⁻⁴
What is the equivalent weight of H₃PO₃ in the reaction?
2 NaOH + H₃PO₃ ⟶ Na₂HPO₃ + 2 H₂O
2M
M
M/2
M/3
Identify the metal M.
Removal of which of the following leads to higher fiber-fiber bonding strength in paper?
Softwood
Hardwood
Lignin
Pulp
Write the action of the gas on acidified K₂Cr₂O₇.
A first order reaction is 50% completed in 10 second. How much time would it take for 90% completion?