19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Which of the following statements(s) is false about the arrangement of particles, in different states of matter?
The molarity of a solution obtained by mixing 750 mL of 0.5 M HCl with 250 ml of 2 M HCl will be
Mole fraction of ethanol in ethanol - water mixture is 0.25. Hence, percentage concentration of ethanol (C2H6O) by weight of mixture is
The weight of one molecule of a compound C60H122 is (BHU 2007)
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)
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
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
Assertion (A) Molarity of a solution depends upon temperature. Reason (R) Volume of a solution is temperature dependent entity.
25 g of MCl4 contains 0.5 mole chlorine then its molecular weight is (Punjab PMET 2007)
The number of gram molecules of chlorine in 6.02×1025 hydrogen chloride molecule is (KCET 2007)
The simplest formula of a compound containing 50% of an element X (atomic weight 10) and 50% of element Y (atomic weight 20) is :
The ratio of masses of oxygen and nitrogen in a particular gaseous mixture is 1: 4. The ratio of number of their molecule is :
The number of water molecules present in a drop of water (volume = 0.0018 ml) at room temperature is (density of H2O = 1 g/mL)