Chemistry questions
29404 published questions with worked solutions.
- Rearrange the following (I to IV) in the order of increasing masses and choose the correct answer (atomic mass; O = 16, Cu = 63,...
- 1.0 g of magnesium is burnt with 0.56 g O_2 in a closed vessel. Which reactant is left in excess and how much? (Atomic weight, Mg...
- When 22.4 L of H_2 (g) is mixed with 11.2 L of Cl_2 (g), each at STP, the moles of HCl(g) formed is equal to
- The number of moles of (NH_4)_2SO_4 Fe_2(SO_4)_3 24 ,H_2O formed from a sample containing 0.0056 g of Fe is
- What is the mass of one molecule of yellow phosphorus? (Atomic mass, P = 30)
- The number of sodium atoms in 2 moles of sodium ferrocyanide is
- 10^ 21 molecules are removed from 200 mg of CO_2 . The moles of CO_2 left are
- One mole of CH_4 contains
- The oxygen obtained from 72 kg of water is
- For 14 g of CO, the wrong statement is
- The vapour density of a gas is 11.2. The volume occupied by one gram of the gas at STP is
- What is the atomic weight of an element X for which a sample containing 1.58 10^ 22 atoms weight 1.05 g?
- Number of molecules in 1 L of water is close to
- The mass of 112 cm^3 of CH_4 gas at STP is
- Cyclohexanol is dehydrated to cyclohexene on heating with conc. H_2SO_4 . If the yield of this reaction is 75%, how much...
- In the synthesis of ammonia N_2(g) + 3H_2 2NH_3(g) If the quantity of N_2 reacted is 700 mL, the quantity of H_2 and NH_3 would be
- A metal oxide has the formula A_2O_3 . It can be reduced by hydrogen to give free metal and water. 0.1596 g of this metal oxide...
- How many moles of magnesium phosphate, Mg_3(PO_4)_2 will contain 0.25 mole of oxygen atom ?
- 20.0 kg of N_2 (g) and 3.0 kg of H_2 (g) are mixed to produce NH_3 (g). The amount of NH_3 (g) formed is
- The total number of electrons in 18 mL of water (density = 1 g mL^ -1 )