19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
What is the molarity of S O ion in aqueous solution that contain 34.2 ppm of Al₂(SO₄)₃ ? (Assume complete dissociation and density of solution 1 g/mL)
An antifreeze mixture contains 40% ethylene glycol (C₂H₆O₂) by weight in the aqueous solution. If the density of this solution is 1.05 g/mL, what is the molar concentration?
The density (in g mL–1) of a 3.60 M sulphuric acid solution that is 29% H₂SO₄ (molar mass = 98 g mol-1) by mass will be MOLE & EQUIVALENT CONCEPT
What volume of 0.4 M FeCl₃ . 6H₂O will contain 600 mg of Fe³⁺ ?
With increase of temperature, which of these changes?
The mole fraction of a given sample of I₂ in C H is 0.2. The molality of I₂ in C₆H₆ is
An aqueous solution of ethanol has density 1.025 g/mL and it is 2 M. What is the molality of this solution ?
A molal solution is one that contains one mole of a solute in
What is the mole fraction of glucose in 10% w/w glucose solution?
Density of a 2.05 M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is
A solution is made by dissolving 49 g of H₂SO₄ in 250 mL of water. The molarity of the solution prepared is
NH₃ is produced according to the following reaction: N₂(g) + 3H₂(g) → 2NH₃(g) In an experiment 0.25 mol of NH₃ is formed when 0.5 mol of N₂ is reacted with 0.5 mol of H₂. What is % yield ?
If 0.5 mole of BaCl₂ is mixed with 0.20 mole of Na₃PO₄, the maximum number of moles of Ba₃(PO₄)₂ then can be formed is
Calculate the number of oxygen atoms required to combine with 7.0g of N₂ to form N₂O₃ if 80% of N₂ is converted into products. N O N O →
If 80.00 g of X combines with 1.5 × 1023 atoms of Y to form X2Y without any of either element remaining, what is the atomic weight of X ?
1 mole of oxalic acid is treated with conc. H₂SO₄. The resultant gaseous mixture is passed through a solution of KOH. The mass of KOH consumed will be (where KOH absorbs CO₂.) (COOH)₂ CO + CO₂ + H₂O 2 KOH + CO₂…
How many moles of ferric alum (NH ) SO Fe (SO ) .24 H₂O can be made from the sample of Fe containing 0.0056 g of it ?
NaOH is formed according to the reaction 2Na O Na O → Na O H O 2NaOH → To make 4g of NaOH, Na required is
What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene ?
Which of the given reactions are counted as balanced reactions? (a) H +O 2H O → (b) 4Al+3O 2Al O → (c) Mg OH +2HNO 2Mg NO +2H O → (d) N +3H NH → Ans. (b) Sol. Al O Al O → is a balanced reaction because the number of a…
Determine the empirical formula of Kelvar, used in making bullet proof vests, is 70.6% C, 4.2% H, 11.8% N and 13.4% O
An organic compound has an empirical formula CH O . It’s vapour density is 45. The molecular formula of the compound is
The empirical formula of a compound is CH₂. One mole of this compound has a mass of 42 g. Its molecular formula is
The simplest formula of a compound containing 50% of an element X (atomic weight 10) and 50% of element Y (atomic weight 20) is :
A compound was found in contain 21.67% Mg, 21.4% C and 57.0% O by mass of oxygen. What is the simplest formula of this compound ?