NDA Examination Chemistry Sample Paper / Model test Paper


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NDA SAMPLE PAPER

SUBJECT – CHEMISTRY

  1. Radioactivity was discovered by –




(a)   Madame Curie

(b)  Rutheford

(c)   J.J. Thomson

(d) Henery Becqurel

2. Temporary hardness of water is due to the presence of

(a) MgSO4 (b) CaSO4

(c) Ca (HCO3)2 (d) NaHCO3

3. One which cannot be obtained by a chemical combination of element –

(a) compounds                                    (b) other element

(c) liquids                                            (d) gases

4. Hydrogen chloride is covalent in –

(a) ethereal solution

(b) aqueous solution of benzene

(c) aqueous solution

(d) none of these

5. An endothermic reaction is one in which –

(a) heat is converted into electricity

(b) heat is evolved

(c) heat is converted into mechanical work

(d) heat is absorbed

6. Which one of the following properties would you not expect copper to exhibit?

(a) ductility

(b) malleability

(c) low thermal conductivity

(d) high electrical conductivity

7. The nitrogen atom has 7 protons and 7 electrons. The nitride ion will have –

(a) 4 protons and 7 electrons

(b) 7 protons and 10 electrons

(c) 4 protons and 10 electrons

(d) 10 protons and 7 electrons

8. What volume of 1 M sulphuric acid solution will be neutralized 10 ml of 1 M sodium hydroxide solution?

(a) 5 ml                         (b) 10 ml

(c) 2.5 ml                       (d)        20 ml

9. Equal volumes of all gases at the same temperature and pressure, contain equal number of –

(a) atoms                               (b) molecules

(c) electrons                          (d) protons

10. 12 gms of magnesium (at. wt. = 24) reacts completely with an acid to evolve hydrogen. The amount of hydrogen produced would be –

(a) 2 gms                                     (b) 4 gms

(c) 0.5 gms                                     (d) 1 gms

11. Bone charcoal is used because it –

(a) oxidises colouring matter

(b) reduces coloring matter

(c) adsorbs colouring  matter

(d) decolourises colouring matter

 

12. Compound used in photography is –

(a) Na2SO3 (b) Na2S2O3

(c) Na2SO5 (d) Na2SO4

13. P2O5 is the anhydride of the acid HPo3. The anhydride of the aacid HClo4 is-

(a) Cl2O7 (b) ClO2

(c) Cl2O                                            (d) None of these

14. The vapour density of a gas is 11.2. The volume occupied by 5.6 gms. of this has at N.T.P. is –

(a) 2 litres                                       (b) 11.2 litres

(c) 22.4 litres                                   (d) 5.6 litres

15. Crimson colour imparted to flame is due to a salt of –

(a) Calcium                                        (b) Barium

(c) Strontium                                      (d) Potassium

16. Diamond and graphite have in common that –

(a) their crystalline structures are identical

(b) they are both forms of carbon

(c) both are extremely hard substances

(d) the same volume of each substances contains the same number of atoms

17. The morality of pure water is –

(a) 18                  (b) 55.6                  (c) 50              (d) 100

18. The silver halide which is least soluble in ammonia solution is –

(a) Silver chloride                            (b) Silver iodide

(c) Silver bromide                              (d) Silver fluoride

19. Crystals of sodium chloride belong to the system –

(a) cubic                                                 (b) orthorhombic

(c) trigonal                                                (d) monoclinic

20. The process by which substance absorbs moisture from atmosphere is called –

(a) condensation                                         (b) dehydration

(c) hydration                                                   (d) none of these

21. An element having no neutron in its nucleus is –

(a) Nitrogen                                                    (b) Protium

( c) Argon                                                         (d) Chlorine

22. Which of the following has largest number of atoms?

(a) 1.00 gm atom of copper

(b) .00 gram of copper

(c) 0.635 gm atom of copper

(d) None of these

23. A sample of a chemical, weighing 0.2 grams is analysed. It is found to consist of 0.12 gram of carbon and 0.04 gram of hydrogen. The rest of the chemical is assumed to be oxygen. The empirical formula is therefore –

( O = 16, C = 12, H = 1)

(a) H2CO2 (b) HCO2

(c) C2H6O                                                        (d) CH4O

24. The oxidation state of manganese in K2MnO4 is –

(a) +2                                                             (b) -6

(c)    +6                                                          (d)  -2

 

25. Which one of the following is a metalloid –

(a) Ca                                                      (b) As

(c) Au                                                     (d) Fe

26. Variable valency is exhibited by –

(a) Transitional element

(b) Nromal elements

(c) Non – metallic elements

(d) None of these

27. The characteristic oxidation number of atoms in free metal is –

(a) one                                                       (b) zero

(c) minus one                                               (d) any number

28. The formula of sodium nitroprusside is –

(a) Na2 [Fe (NO) (CN) 5]

(b) Na4 [Fe (CN) 5 (NOS)]

(c) Na4 [Fe (CN) 6]

(d) None of these

29. If it is desired to obtain dry NH3 gas, the drying agent advisable to use is –

(a) Calcium chloride

(b) Conentrated sulphuric acid

(c) Quicklime

(d) Phosphorous penta chloride

30. The atomic number of potassium is 19. Therefore the number of electrons in the N shell of its atom is –

(a) 9                                                                  (b) 1

(c) 8                                                                 (d) 2

31. The substance which retards the rate of a chemical reaction is called –

(a) Catalyst                                                          (b) Inhibitor

(c) Rutherford                                                         (d) Chadwick

32. Aluminium is placed in the third group of the periodic table. Therefore the formula of its oxide is –

(a) AlO3 (b) AlO

(C) Al2O3 (d) Al3O2

33. Molecular weights of ammonia and hydrogen 17 and 2 respectively. The number of molecules in 7 gms. of ammonia is –

(a) less than the number of molecules in 2 gram of hydrogen

(b) equal to the number of molecules in 2 gram of hydrogen

(c) greater than the number of molecules in 2 gram of hydrogen

(d) equal to the number of atoms in 2 gram of hydrogen

34. The volume of 20 gram of hydrogen gas at S.T.P. is –

(a) 224 litres                                           (b) 22.4 litres

(c) 2.24 litres                                           (d) 112 litres

35. 2.32 gram of silver oxide when placed in excess of hydrogen peroxide solution reacts according to the equation.

Ag2O + H2O —>2 Ag + H2O + O2

(At. wts, O = 16, Ag = 108)

The amount of oxygen liberated in the above reaction at S.T.P. is equal to –

(a) 2240 cm3 (b) 224 cm3

(c) 448 cm3 (d) 1120 cm3

36. In electrovalency –

(a) the transference of electrons takes place

(b) the electrons are shared by only one kind of atoms

(c) sharing of electrons takes place

(d) none of the above is correct

37. Which of the following would yield strongest ionic solution in water?

(a) Nal                                                        (b) NaF

(c) KF                                                                    (d) KCl

38. Which of the following has the smallest number of molecules?

(a) 11.2 litres of SO2 gas at S.T.P.

(b) 1 gram mole of SO2 at S.T.P.

(c) 1 mole of SO2 gas

(d) None of these

 

 

 

 

 

 

 





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