Sample Paper NDA Exam – Chemistry

Sample papers




1. Which of the following states Avogadro’s law?

(a) Equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules

(b) The pressure of a fixed mass of gas at constant temperature is inversely proportional to its volume

(c) Equal volumes of all gases under similar conditions of temperature and pressure contain equal number of atoms

(d) The product of specific heat and atomic weight of a solid element is approximately 6.4

2. The bond between the atom in a nitrogen molecule is –

(a) Single                                      (b) Double

(c) None                                         (d) Triple

3. 100 ml of nitrogen  at 0.30 atm. Pressure and 50 m of carbon dioxide at 0.60 atm. Pressure are introduced into a vessel of volume 150 ml without any change in temperature. What will be the ratio of the partial pressure of nitrogen to carbon dioxide in the vessel?

(a) 1 : 2              (b) 2 : 1                  (c) 1 : 1            (d) 1:  3

4. The reaction in the sun responsible for the maintenance of its high temperature is –

(a) a fission reaction

(b) a fusion reaction

(c) a chemical reaction

(d) an endothermic reaction

5. The melting and boiling points of –

(a) electrovalent compounds are higher than those of coordinate compounds

(b) covalent compounds are same as those of coordinate compounds

(C) covalent compounds are higher than those of coordinate compounds

(d) electrovalent compounds are lower than those of coordinate compounds

6. One gram molecular volume of a gas is the volume occupied by –

(a) 1 gm of the substance

(b) 1 gm molecular wt. of the substance

(c) 6.02 * 1023 gm of the substance

(d) 22.4 gm of the substance

7. Which of the following will not conduct electricity?

(a) a mixture of 50% ethyl alcohol and 50 % water

(b) water acidified with sulphuric acid

(c) sea water

(d) copper sulphate solution

8. The rates of chemical reaction in solution do not depend to any great extent upon –

(a) Temperature                    (b) Concentration

(c) Pressure                               (d) Catalysis

9. The simplest formula of a compound containing 50 percent of element X (atomic weight  = 10) and 50 percent of element Y (atomic weight = 20 ) is –

(a) XY                                (b) X2Y2

(c) XY2 (d) X2Y3

10. The formula for saltpeter is –

(a) KNO3 (b) NaNO3 (c) NaCl               (d) NH4NO3

11. What type of oxide is N2O?

(a) acidic                        (b) basic

(c) amphoteric                  (d) netural

12. The gas least soluble in water is –

(a) HCl                       (b) NH3

(c) N2 (d) CO2

13. Complete combustion of H2S in air results in the production of –

(a) S and H2O                        (b) H2O and SO2

(c) SO2 and H2 (d) H2SO4

14. The substance having the lowest boing point is –

(a) H2S                                   (b) NH3

(c) H2 (d) Cl2

15. Which of the following gases in readily soluble in water?

(a) NO                 (b) CO                (c) NH3               (d) H2

16. Which of the following oxides reacts with both HCl and NaOH?

(a) ZnO          (b) CO2 (c) CaO             (d) N2O5

17. In the reaction

H3PO4 + Ca (OH) 2 = CaHPO4 + 2H2O

The equivalent weight of phosphoric acid is –

(a) 32.7                 (b) 98.0

(c) 49.0                 (d) 196.0

18. The number of valence electrons in carbon atom ( atom number 6) is –

(a) 0                   (b) 4                (c) 2                    (d)       6

19. Which of the following does not yield oxide on heating?

(a) Na2CO3 (b) ZnCO3

(c) CaCO3 (d) Ag2O

20. One gram equivalent of a substance is the weight of that substance which is equivalent to –

(a) 0. 50 gm mole of oxygen

(b) 8. 00 mole of oxygen

(c) 1.00 mole of oxygen

(d) 0.25 gm mole of oxygen

21. Avogadro number of Helium atoms weights –

(a) 1. 00

(b) 8. 00

(c) 4.00

(c) 4.00 * 6.02 * 1023 grams

22. In the compound Na2S2O3, the oxidation state of sulphur is –

(a)  -2             (b) +2             (c)  +4                  (d)  +6

23. Diamond and graphite are the –

(a) allotropic forms of carbon

(b) amorphous forms of carbon

(c) isotropic forms of carbon

(d) isometric forms of carbon

24. When magnesium combines with bromine, magnesium bromide is formed. In process

(a) magnesium is reduced

(b) magnesium is oxidized

(c) bromine is oxidised

(d) oxidation reduction does not occur

25. The substances are said to be isomorphous if –

(a) both substances have similar crystalline forms

(b) both substances have similar chemical

(c) both substances have same valency

(d) both substances have same colour

26. Yellow ammonium sulphide can separate –

(a) Bi2S3 and CuS

(b) Pbs and BiS3

(c) CdS and As2S3

(d) HgS and pbS

27. Hard water may be softened by passing it through a solution of –

(a) Sodium silicate

(b) Ion exchange resins

(c) Barium chloride

(d) Lime stone

28. Borax bead test is given by –

(a) FeSO4 (b) NaCl

(c) CaCO3 (d) KNO3

29. For the system 3A + 2B = C, if K is the equilibrium constant then-

(a) K = [3A] * [2B] / [C]

(b) K = [C] / [3A] * 2B]

(c) K = [A] 3 * [B] 2 / [C]

(d) K = [C] / [A] 3 * [B] 2

30. Atom of U -228 and U235 differ in structure by –

(a) three protons

(b) three electrons

(c) three neutrons

(d) three electrons and three protons

31. Chrome alum contains –

(a) aluminium and no chromium

(b) chromium and no aluminium

(c) both aluminium and chromium

(d) neither aluminium nor chromium

32. Stainless steel contains –

(a) chromium                 (b) aluminium

(c) tin                                (d) magnesium

33. Corrosive sublimate may be converted into calomel by –

(a) placing copper metal in its aqueous solution

(b) heating it with mercury

(c) treating its aqueous solution with the excess of stannous chloride

(d) passing SO2 through its aqueous solution

34. All types of steel contain

(a) Carbon and iron

(b) Chromium and vanadium

(c) Nickel and cobalt

(d) Nickel and chromium

35. The metal used in storage batteries is –

(a) tin                   (b) Copper

(c) Lead                (d) Zinc.

Answer sheet

1. –  (a)8. – (c)15. – (c)22. – (b)29. – (d)
2. –  (d)9. – (b)16. – (a)23. – (a)30. – (c)
3.-  (c)10.- (a)17. – (c)24. –  (b)31. – (b)
4. – (b)11. – (d)18. –  (b)25. – (a)32. – (a)
5. – (a)12. – (c)19. – (a)26. – (c)33. – (b)
6. – ( b)13.-  (b)20. – (d)27. – (b)34. – (a)
7.-  (a)14. – (a)21. – (c)28. – (a)35. – (c)



Sample Paper NDA Exam – Chemistry
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