Hello ! Welcome to your NTSE SAT - Chemistry Instructions: Time: 20:00 min Full Marks: 60 There is negative marking of -1.00 for all incorrect answers chosen. There is no deduction for NOT attempted question. All questions carry equal marks and all 15 questions are of 4 marks each. All Questions are compulsory. (Powered By: Kailasha Foundation - Fun & Learn Portal) Name Email 1. A sample of pure water, irrespective of source, contains 88.89% oxygen and 11.11% hydrogen by mass. The data supports the Law of conservation of mass Law of constant composition Law of multiple proportion Law of reciprocal proportion2. An example of a liquid metal is ......... and that of a liquid non-metal is .......... gallium, mercury mercury, chlorine mercury, bromine bromine, sulphur3. The mass of sodium in 11.7 g of sodium chloride is 2.3 g 4.6 g 6.9 g 7.1 g4. NOTE: Question 4 is based on the following equation: CaCO3 + 2HCl ---> CaCl2 + H2O +CO2 The mass of calcium chloride formed when 2.5 g calcium carbonate are dissolved in excess of hydrochloric acid is 1.39 g 2.78 g 5.18 g 17.8 g5. NOTE: Question 4 is based on the following equation: CaCO3 + 2HCl ---> CaCl2 + H2O +CO2 The volume of CO2 gas formed when 2.5 g calcium carbonate are dissolved in excess of hydrochloric acid at 0and 1 atm pressure is [1 mole of any gas at 0 and 1 atm pressure occupies 22.414 volume] 1.12 L 56.0 L 0.28 L 0.56 L6. In the following equations Na2CO3 + xHCl ---> 2NaCl +CO2 + H2O the value of x is 1 2 3 47. The number of gram-atoms in 8 g of He are 2 1.204 X 10^(24) 3.10 X 10^(23) 48. Which of the following contains the largest number of molecules? 0.2 mole of H2 8.0 g of H2 17.0 g of H2O 6.0 g of CO29. Which of the following weighs the most? 10^(23) molecules of H2 1 mole of H2O 1 mole of N2 10^(22) atoms of oxygen10. A sample of ammonium phosphate (NH4)3PO4 contains 3.18 mole of hydrogen atoms. The number of moles of oxygen atoms in the sample is 0.265 0.795 1.06 4.0011. When pentane, C5H12 is burned in excess oxygen the products of the reaction are CO2 (g) and H2O (l). The balanced equation for this combustion is C5H12 (g) + xO2 (g) ---> 5CO2 (g) + 6H2O (l) the coefficient (x) of oxygen should be 16 12 11 812. 33 L of H2 and 36.99 L of N2 are mixed at a certain temperature and pressure to prepare NH3. The volume of NH3 produced at same temperature and pressure is 4.11 L 8.22 L 12.33 L 24.66 L13. The total number of valence electrons in 4.2 g of N3- ion, is (NA is the Avogadro number) 1.6 NA 3.2 NA 2.1 NA 4.2 NA14. A B C D15. Volume at STP of 0.42 g of CO2 is the same as that of 0.01 g of hydrogen 0.085 g of NH3 320 mg of gaseous SO2 All of them You can always contact system administrator here for any kind of technical glitches.