1 Choose the most correct option A A sample of pure water
Last updated: 6/30/2023
1 Choose the most correct option A A sample of pure water whatever the source always contains by mass of oxygen and 11 1 by mass of hydrogen a 88 8 b 18 c 80 d 16 B Which of the following compounds can NOT demonstrate the law of multiple proportions a NO NO c H O H O C Which of the following temperature will read the same value on celsius and Fahrenheit scales a 40 b CO CO d Na S NaF b 40 c 80 d 20 D SI unit of the quantity electric current is a Volt c Candela E In the reaction N 3H 2NH the ratio by volume of N H and NH is 1 3 2 This illustrates the law of b Ampere d Newton a definite proportion b reciprocal proportion Exercises c multiple proportion d gaseous volumes a 4 5 c 0 25 F Which of the following has maximum number of molecules a 7 g N c 8 g 0 G How many g of H O are present in 0 25 mol of it b 2 g H d 20 g NO b 18 d 5 4 H The number of molecules in 22 4 cm of nitrogen gas at STP is a 6 022 x 1020 b 6 022 x 1023 c 22 4 x 1020 d 22 4 x 1023 I Which of the following has the largest number of atoms a 1g Au s b 1g Na s 2 Answer the following questions A State and explain Avogadro s B Point out the difference betwe carbon and 12 u of carbon C How many grams does an hydrogen weigh D Calculate the molecular ma following in u a NH b CH COOH c CH E How many particles are pre mole of a substance F What is the SI unit of amc substance G What is meant by molar vol gas H State and explain the law of com of mass I State the law of multiple propc 3 Give one example of each A homogeneous mixture B heterogeneous mixture C element 4 Solve problems D compound A What is the ratio of molecules of NH and 1 mole of HNO A B Calculate number of moles of E in 0 448 litre of hydrogen gas c Ans 0 C The mass of an atom of hyd 1 008 u What is the mass of 1 of hydrogen 18 144 u D Calculate the number of atom of the following Given Atom of I 127 u a 254 u of iodine I b 254 g of iodine I Ans 2 atoms 1 2044 x 10 E A student used a carbon pencil his homework The mass of th found to be 5 mg With the help calculate The