One mole of calcium phosphide on reaction with excess of water gives [IIT 1999]

Question: One mole of calcium phosphide on reaction with excess of water gives [IIT 1999]

(a) One mole of phosphine

(b) Two moles of phosphoric acid

(c) Two moles of phosphine

(d) One mole of phosphorus pentoxide

Correct Answer: (c) Two moles of phosphine

More Question

1. Which of the following contains maximum number of atoms [JIPMER 2000]
2. A compound possesses 8% sulphur by mass. The least molecular mass is [AIIMS 2002]
3. The molar heat capacity of water at constant pressure is 75 JK^-1 mol ^-1. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increases in temperature of water is [CBSE PMT 2003]
4. 10 dm³ of N₂ gas and 10 dm³ of gas X at the same temperature contain the same number of molecules. The gas X is
5. Zinc sulphate contains 22.65% of zinc and 43.9% of water of crystallization. If the law of constant proportions is true, then the weight of zinc required to produce 20 g of the crystals will be
6. Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of [Kerala CEE 2002]
7. Mixture of sand and sulphur may best be separated by [Kerala CET 2001]
8. 100 g CaCO₃ reacts with 1litre 1 N HCl. On completion of reaction how much weight of CO₂ will be obtain [Kerala CET 2005]
9. 1.5 mol of O₂ combine with Mg to form oxide MgO. The mass of Mg (at. mass 24) that has combined is [KCET 2001]
10. What will be the volume of CO₂ at NTP obtained on heating 10 grams of (90% pure) limestone [Pb. CET 2001]
11. A compound contains atoms of three elements in A, B and C. If the oxidation number of A is +2, B is +5 and that of C is – 2, the possible formula of the compound is [CBSE PMT 2000]
12. The simplest formula of a compound containing 50% of element X (atomic mass 10) and 50% of element Y (atomic mass 20) is [Roorkee 1994]
13. 1.12 ml of a gas is produced at STP by the action of 4.12 mg of alcohol, with methyl magnesium iodide. The molecular mass of alcohol is [Roorkee 1992; IIT 1993]
14. A solution of 10 ml M/10 FeSO₄ was titrated with KMnO₄ solution in acidic medium. The amount of KMnO₄ used will be [CPMT 1984]
15. What should be the weight and moles of AgCl precipitate obtained on adding 500ml of 0.20 M HCl in 30 g of AgNO₃ solution? ( AgNO₃ = 170)
16. What should be the weight of 50% HCl which reacts with 100 g of limestone