chemistry

CLASS 10TH ACIDS AND BASES BITS

1. When non metallic oxides are dissolved in water, ______are formed.

2. When metallic oxides are dissolved in water, _____are formed.

3. Blue litmus changes into red colour in the presence of_______.

4. Acid changes the colour of the methyl orange indicator into________.

5. Acids react with bases to form _________

6. Red litmus changes into blue colour in the presence of __________

7. Base changes the colour of the methyl orange indicator into _________

8. According to Arrhenius theory, acids are the substances which produce_____ions in aqueous solution.

9. According to Arrhenius theory, bases are the substances which produce _____ions in aqueous solution.

10. Arrhenius theory is applicable only for the substances which are soluble in _____only.

11. At 250C, the concentration of H+ ions is ____to the concentration of OH- ions.

12. The ionization of water is _______dependent.

13. Increase in the temperature ______the extent of ionization.

14. The product of concentrations of H+ ions and OH- ions in one mole of water is defined as the ____

15. Ionic product of water Kw = _____

16. At 250C, Kw = ______

17. The term pH is introduced by _______

18. The negative logarithm of H+ ion concentration is defined as the _____

19. pH = __________

20. If pH < 7, then the solution is_________.

21. If pH > 7, then the solution is ___________

22. If pH = 7, then the solution is _________

23. The pH of 0.001M Hcl solution is ________

24. The concentration of H+ ions in a solution whose pH = 8 is _____

25. The Kw is ___________________dependent.

26. Example for strong acid is ________

27. Example for weak acid is ________

28. Example for strong base is_______.

29. Example for weak base is ____________

30. The heat liberated when one mole of acid reacts with one mole of base is defined as the ________

31. The heat evolved when a strong acid reacts with a strong base is equal to __________

32. NaOH + Hcl Nacl + H2O + ____________

33. The body fluid whose pH > 7 is ____________

34. Weak acids ionize upto _________

35. The colour of phenophthalene indicator in basic solution is__________.

36. The pH of acids is in the range of _________

37. The pH of bases is in the range of __________

38. For weak acids and weak bases the percentage of ionization increases with increasing _______

39. The pH of gastric juice is _________

40. Strong acids ionize upto _____________

ANSWERS

1) Acids

2) Bases

3) Acid

4) Red

5) Salt and water

6) Base

7) Yellow

8) H+

9) OH-

10) Water

11) Equal

12) Temperature

13) Increases

14) Ionic product of Water (Kw)

15) [H+] x [OH-]

16) 1.0 x 10-14 Mole ion2 / Litre2

17) Sorenson

18) PH

19) – log [H+}

20) Acid

21) Base

22) Neutral

23) 3

24) 10-8

25) Temperature

26) Hcl

27) CH3COOH

28) NaOH

29) NH4OH

30) Heat of Neutralization

31) 13.7 K. cal/mole

32) 13.7 K.Cal/mole

33) Blood

34) <100%

35) Pink

36) 0 to 7

37) 7 to 14

38) Dilution

39) 1 to 2

40) 100%