ECAT 2017 Chemistry Portion

ECAT 2017 CHEMISTRY PORTION

1. What is the empirical formula for glucose?
   

2. Which of the following statements is correct?
   

3. Base principle of crystallization is:
   

4. The bubbling up of gas from soda drink is best explained by:
   

5. The effect of pressure on density of gas is explained as under:
   

6. Forces which make the liquefaction of Helium gas possible are:
   

7. Existence of sulphur in two forms is:
   

8. The low boiling point of hydrofluoric acid (HF) as compared to water (H₂O) is due to:
   

9. Radiations emitted in the form of photons when electrons of Hydrogen atom fall from higher level to n = 1 are in the:
   

10. The structure of Nitrogen molecule (N₂) is explained by:
    

11. The solubility of sodium chloride in water is possible because:
    

12. Calculate enthalpy change in formation of NaHCO_{3 (aq)} using Hess’s law:
    
    

13. According to the first law of thermodynamics, if thermal energy is applied to water placed in a cylinder fitted with a friction-less piston:
    

14. In the reaction
    
     if heat is applied at equilibrium stage, it is observed that:

15. NaCl is not soluble in acetone because:
    

16. Ethylene glycol is mixed with water in automobile radiators as antifreeze because:
    

17. Oxidation number of sulphur in is:
    

18. During the purification process of copper, a thin sheet of pure and impure copper is placed in electrolytic cell, which results in:
    

19. The purpose of two half cells in a galvanic cell is:
    

20. Catalyst helps in a reaction by:
    

21. Sub-group “B” of the periodic table represents:
    

22. When an electron is added to O then the energy change is expressed by:
    

23. The important usage of lime in agriculture is:
    

24. Quartz crystal has typical tetrahedral structure between oxygen and silicon atoms. How many silicon atoms are connected to an oxygen atom in this structure?
    

25. In the reaction
    
    NO₂ acts as:

    

26. In the reaction
    
    H₂SO₄ acts as:
    

    

27. True statement(s) about para-magnetic property of transition elements is/are:
    

28. Tubes made of steel can be hammered while hot, but a cutting tool also made of steel cannot be hammered while hot. This due to:
    

29. Alkanes are less reactive as compared to alkenes because:
    

30. Important property of polymers of PVC pipes is:
    

ANSWERS

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