19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
In which case is number of molecules of water maximum? (NEET 2018)
The number of moles of hydrogen molecules required to produce 20 moles of ammonia through Haber’s process is (NEET 2019)
The density of 2 M aqueous solution of NaOH is 1.28 g/cm3. The molality of the solution is [Given that molecular mass of NaOH = 40 g mol–1] (Odisha NEET 2019)
Which one of the following has maximum number of atoms? (NEET 2020)
Mole fraction of ethanol in ethanol - water mixture is 0.25. Hence, percentage concentration of ethanol (C2H6O) by weight of mixture is
What is the weight % sulphuric acid in an aqueous solution which is 0.502 M in sulphuric acid? The specify gravity of the solution is 1.07
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?
In which mode of expression, the concentration of a solution remains independent of temperature ?
An organic compound contains 78% (by wt.) carbon and remaining percentage of hydrogen. The right option for the empirical formula of this compound is: [Atomic wt. of C is 12, H is 1] (NEET 2021)
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
0 3 . x x
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 ->
ms ato x Therefore, X 3 10 x atoms Number of moles=Moles N 3.0 10 6.022 10 mol 160.58 / 1.6 10 A M M g mol x >> x x x >> x
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 n…
According to the law of conservation of mass …A… has the same number of atoms of each element on both sides of the equation. Here, A refers to
What mass of 95% pure CaCO3 will be required to neutralise 50 mL of 0.5 M HCl solution according to the following reaction? CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + 2H2O(l) [Calculate upto second place of decimal po…