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Hello ! Welcome to your NTSE SAT - Chemistry

Instructions:

Time: 20:00 min                                                                                                          Full Marks: 60

  1. There is negative marking of -1.00 for all incorrect answers chosen.
  2. There is no deduction for NOT attempted question.
  3. All questions carry equal marks and all 15 questions are of 4 marks each.
  4. All Questions are compulsory.

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1. A sample of pure water, irrespective of source, contains 88.89% oxygen and 11.11% hydrogen by mass. The data supports the
2. An example of a liquid metal is ......... and that of a liquid non-metal is ..........
3. The mass of sodium in 11.7 g of sodium chloride is
4. 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
5. 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]
6. In the following equations

Na2CO3 + xHCl ---> 2NaCl +CO2 + H2O

the value of x is
7. The number of gram-atoms in 8 g of He are
8. Which of the following contains the largest number of molecules?
9. Which of the following weighs the most?
10. 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
11. 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
12. 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
13. The total number of valence electrons in 4.2 g of N3- ion, is (NA is the Avogadro number)
14. NTSE SAT
15. Volume at STP of 0.42 g of CO2 is the same as that of

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