19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
HCl is 80% ionised in 0.01 M aqueous solution. The equilibrium molarity of HCl in the solution is
The molarity of 68 % of H2SO4 whose density is 1.84 g/cc is
Calculate the analytical molarity of Cl– ion in solution which is prepared by mixing 100 ml of 0.1 M NaCl and 400 ml of 0.01 M BaCl2.
The following process has been used to obtain iodine from oil-field brines in California. NaI + AgNO3 ->AgI + NaNO3 AgI + Fe ->FeI2 + Ag FeI2 + Cl2 ->FeCl3 + I2 If 381 kg of iodine is produced per hour then mass of A…
NX is produced by the following step of reactions M + X2 -> M X2 MX2 + X2 ->M3X8 M3X8 + N2CO3 ->N X + CO2 + M3O4 How much M (metal) is consumed to produce 206 gm of NX. (Take At. wt of M = 56, N=23, X = 80)
Assertion: Equivalent weight of a base molecular weight = acidity Reason: Acidity is the number of replaceable hydrogen atom in one molecule of the base.
Assertion : 1mole of H2SO4 is neutralised by 2 moles of NaOH but 1 equivalent of H2SO4 is neutralised by 1 equivalent of NaOH. Reason : Equivalent weight of H2SO4 is half of its molecular weight while e…
Assertion :For a binary solution of two liquids, A and B, with the knowledge of density of solution, molarity can be converted into molality. Reason: Molarity is defined in terms of volume and molality …
Assertion : If 30 mL of H2 and 20 mL of O2 react to form water, 5 mL of H2 is left at the end of the reaction Reason :H2 is the limiting reagent.
Assertion :Number of molecules present in SO2 is twice the number of molecules present in O2. Reason : Molecular mass of SO2 is double to that of O2.
Assertion :Both 12g of carbon and 27g of aluminium contain 6.023 × 1023 atoms. Reason :Molar mass of an element contains Avogadro number of atoms.
Assertion : Both 138 g of K2CO3 and 12 g of carbon have same number of carbon atoms. Reason : Both contains 1 g atom of carbon which contains 6.022 × 1023 carbon atoms.
Assertion :Pure water obtained from different states of India always contains hydrogen and oxygen in the ratio of 1 : 8 by mass. Reason: Total mass of reactants and products during chemical change is always the same.
5 mL of N-HCl, 20 mL of N/2 H2SO4 milli equivalent and 30 mL of N/3 HNO3 are mixed together and the volume is made to 1L. The normality of the resulting solution is
N2 + 3H2-> 2NH3 Molecular weight of NH3 and N2 are x1 and x2, respectively. Their equivalent weights are y1 and y2, respectively. Then (y1 – y2) is (a) 2x x
Given the reaction : Na O(s) H O( ) 2NaOH(aq) -> l What is the molarity of the solution formed if 1.35g of Na2O is mixed with H2O such that the final volume is 100 mL?
A solution containing 12.0% NaOH by mass has a density of 1.131 g/mL. What volume of this solution contains 5.00 mol of NaOH ?
A solution of NaOH is prepared by dissolving 4.0 g of NaOH in 1 L of water. Calculate the volume of the HCl gas at STP that will neutralize 50 mL of this solution.
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…
In a compound C, H and N atoms are present as 9%, 1%, 3.5% respectively. Molecular weight of compound is 108. Molecular formula of compound is (a) C H N (b) C H N (c) C H N (d) C H N
When a hydrate of Na2CO3 is heated until all the water is removed, it loses 54.3 per cent of its mass. The formula of the hydrate is
A 27.0 g sample of an unknown hydrocarbon was burned in excess O2 to form 88g of CO2 and 27g of H2O. What is possible molecular formula of hydrocarbon ?
The total number of electrons present in 18 ml of water (density of water is 1 g ml–1) is
Number of atoms in 560g of Fe (atomic mass 56 g mol–1) is
If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will