Sample Paper NDA Exam – Chemistry


Sample papers





 

NDA SAMPLE PAPER

SUBJECT – CHEMISTRY

1. The critical temperature of a substance is defined as –

(a) the temperature above which the substance decomposes

(b) the temperature above which a substance can exist only as gas

(c) melting point of the substance

(d)  boiling point of the substance

2. Which of the following is a good conductor of heat and electricity?

(a) Graphite                           (b) Anthracite

(c) Diamond                            (d) Charcoal

3. Phenolphthalein does not act as an indicator for the titration between –

(a) KOH and H2SO4

(b) Ba (OH) 2 and HCl

(c) NaOH and Acetic acid

(d) Oxalic acid and KMno4

4. One of the products of a reaction between solid KMnO4 and concentrated HCl is –

(a) a red liquid

(b) MnO2

(c) a greenish – yellow gas

(d) HClO4

5. When ammonium chloride is added to a solution of ammonium hydroxide –

(a) the dissociation of ammonium hydroxide increases

(b) the concentration of hydroxide ions decreases

(c) the concentration of both ammonium and hydroxide ions increases

(d) the concentration of only hydroxide ions increases

6. The nuclides ( a nuclide is the general name for any nuclear species)

12                                56                                                              238

C                                  Fe                         and                                  U

6,                                 26,                                                              92

Have 12, 56 and 238 nucleous respectively in their nuclei. The total number of nucleous in a nucleus is equal to –

(a) the total number of protons and neutrons in the nucleus

(b) the total number of electrons in the atom

(c) the total number of protons in the nucleus

(d) the total number of neutrons in the nucleus

7. Hydrogen peroxide solution used for hair bleaching is sold as solution of approximately 5.0 g. of H2O2 per 100 ml. of the solution. The molecular weight of hydrogen peroxide is 34. The molarity of this hairbleaching solution is approximately –

(a) 0. 15                                         (b) 1.5

(c) 3. 0                                                 (d) 50.0

8. Which of the following is useful for making pure water from a solution of salt in water?

(a) distillation

(b) filtration

(c) chromatograpy

(d) steam distillation

9. Which of the following burns to form an oxide which is gaseous at room temperature?

(a) Hydrogen                              (b) Helium

(c) Sulphur                                    (d) Sodium

10. Which of the following would lose weight on exposure to the atmosphere?

(a) conc.  H2SO4

(b) a saturated solution of CO2

(c) solid NaOH

(d) sodium carbonate

11. In which of the following reactions has italicized substance been reduced?

(a) carbon monoxide + copper oxide = carbon dioxide  + copper

(b) copper oxide + hydrochloric acid = copper chloride + water

(c) hydrogen + iron oxide = water + iron

(d) steam + iron = hydrogen + iron oxide

12. Which one of the following would be the best absorbing maerial for the carbon dioxide?

(a) cold solid calcium chloride

(b) heated copper oxide

(c) heated charcoal

(d) cold solid calcium hydroxide

13. Ammonium nitrate decomposes on heating to –

(a) ammonia and nitric acid

(b) nitrogen, hydrongen and ozone

(c) nitrous oxide and water

(d) nitric oxide, nitrogen dioxide and hydrogen

14. The position of some metals in electrochemical series in decreasing electronegative character is given as

(a) Mg > Al > Zn > Cu > Ag

What will happen if a copper spoon is used to stir a solution of aluminium nitrate?

(a) the spoon gets coated with aluminium

(b) the solution becomes blue

(c) an alloy of copper and aluminium is formed

(d) there in no reaction

15. The ions in a solution which cannot be displaced by magnesium –

(a) Sodium                              (b) Aluminium

(c) Copper                                 (d) Gold

16. The slow cooling of glass is known as –

(a) lehring                                (b) annealing

(c) extruding                              (d) culleting

17. Silver nitrate produces a black stain on skin due to –

(a) its reduction to metallic silver

(b) its strong reducing action

(c) its corrosive action

(d) the formation of a complex compound

18. The action of water on aluminium carbide yields –

(a) propane                                           (b) ethylene

(c) methane                                              (d) acetylene

19. Formaldehyde reacts with concentrated sodium hydroxide solution to from sodium formate and methanol. This reaction is called –

(a) Hoffman’s reaction

(b) Cannizzaro’ reaction

(c) Friedel Craft’s reaction

(d) Stephen’s reaction

20. Which of the following compounds has an electrovalent link

(a) MgCl2 (b) CCl4

(c) CH3Cl                                                  (d) none of these

21. A compound of empirical formula C2H5O has molecular weight of 90. Its molecular formula is –

(a) C2H5O                                             (b) C4H5O2

(c) C2H10O2 (d) C4H10O2

22. Ethylene may be prepared by the dehydration of –

(a) methyl alcohol                              (b) propyl alcohol

(c) ethyl alcohol                                     (d) acetic acid

23. The product of reactin between a carboxylic acid and an alcohol  is known as –

(a) salt                                          (b) an ester

(c) a soap                                    (d) none of these

 

24. Ethylene may be reaction between a carboxylic acid and an alcohol is known as –

23. This first there members of the paraffin series are CH4 C2H6 C3H6. The next higher homologue of this series will be –

(a) C4H10 (b) C4H3

(c) C4H6 (d) C4H7

25. The component of food which is primarily used for regenerating and building tissues is –

(a) fats                                        (b) proteins

(c) carbohydrates                            (d) minerals

26. Amino acids are found in –

(a) proteins                     (b) fats

(c) starch                         (d) oils

27. A gas on passing through ammonical solution of AgNO3 does not give any precipitate but decolourises alkaline KMnO4 solution. The gas may be –

(a) C2H6 (b) C3H8

(c) C2H4 (d) C2H2

28. Canesugar on hydrolysis gives –

(a) glucose  and maltose

(b) glucose and fructose

(c) glucose and fructose

(d) only glucose

29. A mixture of methane, ethylene and acetylene gases is passed through a woulfe’s bottle containing ammonical Cu2Cl2. The gas coming out is –

(a) a mixture of methane and ethylene

(b) methane

(c) acetylene

(d) the original mixture

30. Which of the following liberates methane gas on treatment with water?

(a) Silicon carbide

(b) Iron carbide

(c) Calcium carbide

(d) Aluminium carbide

31. Isomers are compound having –

(a) the same structure but different molecular formula

(b) same empirical formulae but different molecular formulae

(c) same molecular formulae but different structures

(d) different molecular formula and different structures

32.A metallic carbide on treatment with water gives a colourless gas which burns readily in air and gives a precipitate with ammonical silver nitrate solution. The gas evolved is –

(a) methane                                     (b) acetylene

(c) ethane                                             (d) ethylene

33. Acetic acid is obtained when –

(a) acetaldehyde is oxidized with potassium dichromate and sulphuric acid

(b) methyl alcohol oxidized with postassium permanganate

(c) calcium acetate is distilled in the presene of calcium formate

(d) glycerol is heated with sulphuric acid

34. The compound containing the largest number of atoms of chlorine per molecule among the following is –

(a) polyvinyl chloride chloride

(b) carbon tetrachloride

(c) trichloroethylene

(d) trichloromethane

35. The bond angle in carbon tetrachloride is –

(a) 1090 (b) 900

(c) 1200 (d) 1800

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. – (d) 17. – (a) 24. – (a) 31. – (c)
4. – (c) 11.-  (d) 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. – (d) 21. – (d) 28. –  (b) 35. – (a)


 

 

 

 

 



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