Stoichiometry Essay

1 Level – 1
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CHEMISTRY STOICHIOMETRY Used for mcqs chapter wise XII Used for mcqs chapter wise XI

If water sample are taken from sea, rivers or lake, they will be found to contain hydrogen and oxygen in the approximate ratio of 1 : 8. This indicates the law of: a) Multiple proportion b) Definite proportion c) Reciprocal proportions d) None of these Hydrogen and oxygen combine to form H2O2 and H2O containing 5.93 % and 11.2 % hydrogen respectively. The data illustrates: a) law of conservation of mass b) law of constant proportion c) law of reciprocal proportion d) law of multiple proportion One of the following combinations illustrate law of reciprocal proportions: a) N2O3 , N2O4 , N2O5 b) NaCl , NaBr , NaI c) CS2 , CO2 , SO2 d) PH3 , P2O3 , P2O5 All the substances listed below are fertilizers that contribute nitrogen to the soil. Which of these is the richest source of nitrogen on a mass percentage basis? a) Urea, (NH2)2CO b) Ammonium nitrate, NH4NO3 c) Nitric oxide, NO d) Ammonia, NH3 Cisplatin, an anticancer drug, has the molecular formula Pt(NH3)2Cl2. What is the mass (in gram) of one molecule ? (Atomic weights : Pt = 195, H = 1.0, N = 14, Cl = 35.5) a) 4.98 × 10−21 b) 4.98 × 10−22 c) 6.55 × 10−21 d) 3.85 × 10−22 Aspirin has the formula C9H8O4. How many atoms of oxygen are there in a table spoon weighing 360 mg? a) 1.204 × 1023 b) 1. 08 × 1022 c) 1.204 × 1024 d) 4.81 × 1023 20 g of an ideal gas contains only atoms of S & O occupies 5.6 L at NTP. What is the mol. wt. of gas? a) 64 b) 80 c) 96 d) None of these A sample of ammonium phosphate, (NH4)3PO4 contains 6 moles of hydrogen atoms. The number of moles of oxygen atoms in the sample is: a) 1 b) 2 c) 4 d) 6 Total number of moles of oxygen atoms in 3 litre O3 (g) at 270C and 8.21 atm are: a) 3 b) 2 c) 1 d) None of these

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10. 3.011 × 1022 atoms of an element weight 1.15 gm. The