Sample Paper NDA Exam – Chemistry


Sample papers


NDA SAMPLE PAPER

SUBJECT – CHEMISTRY




 

1. The bell metal is an alloy of –

(a) Nickel and copper

(b) Tin and copper

(c) Zinc and copper

(d) Tin and aluminium

2. Iron obtained from blast furnace is –

(a) pig iron                    (b) cast iron

(d) wrought iron              (d) mild steel

3. Calcination is the process of –

(a) heating the ore in an oxidizing atoms phere

(b) heating the ore in a reducing atmosphere

(c) heating the ore in the presence of air

(d) heating the ore in the absence of air

4. Which one of the following metals does not react with water or steam?

(a) Iron                             (b) Magnesium

(c) Copper                      (d) Potassium

5. When a piece of metal is heated with dilute sulphuric acid it gives off hydrogen. Hydrogen is also given off when the same metal is heated with a solution of potassium hydroxide. The metal among the following is –

(a) Iron                                   (b) Magnesium

(c) Silver                                 (d) Gold

6. Which of the following metals is not found in free state?

(a) Sodium                                (b) Copper

(c) Silver                                    (d) Gold

7. Iron is extracted from –

(a) azurite                (b) haematite

(c) lepidolite              (d) cryolite

8. Bleaching powder is prepared by –

(a) chlorinating slaked lime

(b) bleaching milk of lime

(c) heating milk of lime

(d) double decomposition of quick lime

9. Glass on cooling suddenly becomes –

(a) malleable                         (b) ductile

(c) brittle                                (d) soft

10. Chemical formula for plaster of paris is –

(a) CaSO4 (b) (CaSO4). 2 H2O

(c) 2CaSO4.2H2O                        (d) CaSO4. 4H2O

11. Reactions rates increase with temperature primarily because –

(a) greater number of activated molecules are formed

(b) more collisions occur between ions and molecules

(c) equilibrium does not occur at high temperature

(d) of Le Chatelier principal

12. Which one of the following salts is glauber’s salt?

(a) NaNO3 (b) Na2CO3

(c) Na2SO4 (d) Na2SO4.10H2O

13. To extract copper, the ore most commonly used is –

(a) cuprite                                       (b) copperglance

(c) copper pyrites                               (d) azurite

14. Which is heaviest among the following?

(a) Lead                           (b) Gold

(c) Silver                         (d) Iron

15. The colour of cadmium sulphide is –

(a) yellow                        (b) orange

(c) black                            (d) violet

16. An acid radical contained in a salt which neither reacts with dil H2SO4 nor with cons. H2SO4

(a) oxalate                                  (b) sulphate

(c) nitrite                                         (d) acetate

17. Calcium chloride and potassium chloride solution could easily be distinguished from one another by –

(a) performing a flame test on each solution

(b) comparing their colours

(c) adding a solution of silver nitrate to each solution

(d) adding ammonium hydroxide to each solution

18. Which one of the following acid radicals is tasted by using lead acetate paper?

(a) acetate                               (b) oxalate

(c) sulphide                                (d) sulphite

19. Which of the following metallic salts becomes yellow on heating

(a) Lead chloride                        (b) Zinc oxide

(c) Calcium carbonate                  (d) Aluminium sulphate

20. The gas which is evolved on strong heating of Lead nitrate crystals –

(a) NO2 + O2 (b) NO2

(c) O2 (d) NO

21. On adding potassium iodide to a solution of copper sulphate –

(a) no change takes place at all

(b) cupric iodide is precipitated

(c) metallic copper is precipitated

(d) cuprous iodide is precipitated with the liberation of iodine

22. Platinum metal can be dissolved in –

(a) hot concentrated hydrochloric acid

(b) hot concentrated nitric acid

(c) a mixture of hydrochloric and nitric acid

(d) hot concentrated sulphuric acid

23. An aqueous solution of aluminium sulphate would show –

(a) a basic reaction

(b) an acidic reaction

(c) a neutral reaction

(d) both acidic and basic reaction

24. On heating a mixture of potassium dichromate and sodium chloride with concentrated sulphuric acid the compound formed is –

(a) chromyl chloride

(b) chlorine dioxide

(c) chromium chloride

(d) chromic acid

25. Action of concentrated nitric acid on metallic tin produces –

(a) stannous nitrite

(b) hydrated stannic oxide

(c) stannous nitrate

(d) stannic nitrate

26.   Chemical formula for calcium pyrophosphate is Ca2P2O7. The formula for ferric pyrophosphate will be –

(a) Fe (P2O7)3

(b) Fe (P2O7)2

(c) Fe2 (P2O7)3

(d) Fe3P2O7

27.  White phosphorous boiled with strong solution of caustic soda produces –

(a) Red phophours

(b) Sodium phosphide

(c) Phosphine

(d) Sodium phosphate

28. Which of the following sulphides in not soluble in hot dilute nitric acid?

(a) CuS                                          (b) HgS

(c) ZnS                                            (d) CdS

29. A solution containing ammonium chloride and sodium nitrite on boiling produces –

(a) Nitrogen

(b) Nitrous oxide

(c) Nitrogen dioxide

(d) ammonia

30. Which one of the following  oxides is a true acidic anhydride?

(a) CO                             (b) NO

(c) ClO2 (d) N2O5

31. The heaviest atom amongst the four below, is –

(a) Ra                                (b) Pb

(c) U                                    (d) Hg

32. Temporary hardness may be removed from water by adding –

(a) CaCO3 (b) Ca (OH) 2

(c) CaSO4 (d) HCl

33. Substance soluble in ammonia is –

(a) Cu (OH) 2 (b) Al (OH) 3

(c) Fe (OH) 3 (d) Cr (OH) 3

34. H3PO3 is –

(a) a tribasic acid                  (b) a dibasic acid

(c) neutral                             (d) basic

35. Helium and argon are monoatomic gases with their atomic weights 4 and 40 respectively. Under indentical conditions helium will diffuse through a semi – permeable membrance –

(a) 3. 16 times as fast as argon

(b) 7. 32 times as fast as argon

(c) 1. 58 times as fast as argon

(d) 10 times as fast as argon

36. Glass is soluble in –

(a) H2SO4             (b) HClO4

(c) HF                    (d) aqua regia

 

Answer sheet

 

1. –b 8. –a 15. –a 22. –c 29. –a
2. –a 9. –c 16. –b 23. –b 30. –d
3. –d 10. –b 17. –a 23. –a 31. –c
4. –c 11. –a 18. –c 25. –b 32. –b
5. –b 12. –d 19. –b 26. –a 33 .- a
6. –a 13. – c 20. –a 27. –c 34. –b
7. -b 14. -b 21. -d 28. -b 35. –a
36. c


 

 



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