Sample Paper Chemistry NDA Exam –

Sample papers




1. Which of the following classes of elements has the strongest tendency to gain an electron?

(a) Li, Na, K, Rb                           (b) F, Cl Br, I

(c) C, Si, Ge, Sn                              (d) Mn, Fe, Co, Ni

2. Out of the following largest number of atoms is contained in –

(a) 10 g of CaCO3 (b) 4 g of H2

(c) 8 g of NH4NO3 (d) 1.8 g of C6H12O6

3. Which of the following substances is a gas at ordinary temperature?

(a) SiO2 (b) C2H6

(c) H2SO4 (d) P2O5

4. Atomic weights of carbon nitrogen and oxygen are 12, 14 and 16 respectively. An atom of atomic weight 14 and nuclear charge + 6 is an isotope of –

(a) Oxygen                                      (b) Carbon

(c) Nitrogen                                        (d) None of these

5. Assuming that petrol is octane (C2H18) and has a density 3.8, 1.42f5 litres of petrol on complete combustion will consume –

(a) 100 moles of oxygen

(b) 125 moles of oxygen

(c) 150 moles of oxygen

(d) 175 moles of oxygen

6. An organic compound whose molecules are associated through hydrogen bonding –

(a) a Paraffin                                         (b) Benzene

(c) an alcohol                                              (d) an olefin

7. Two litres of gas are maintained at 250C and two atmospheric pressure. If the pressure is doubled and absolute temperature is halved, the gas will now occupy –

(a) 2.0 litres                                    (b) 4.0 litres

(c) 0.5 litres                                         (d) 1.0 litre

8. At N.T.P., 5.6 litres of a gas weighs 60 gm. The vapour density of the gas is –

(a) 60                                     (b) 120

(c) 30                                          (d) 240

9. 10 gm of hydrofluoric acid gas occupies 5.6 litres of volume at N.T.P. The empirical formula of the gas is HF. The molecular formula in gaseous state will be –

(a) HF                                            (b) H2F2

(c) H3F3 (d) H4F4

10. 100 ml of 0.3  N HCl solution was mixed with 200 ml of 0.6 N H2SO4 solution. The final acidic normality was –

(a)  0.9 N                           (b) 0.6 N

(c) 0.5 N                                  (d) 0.4 N

11. 100 ml of 0.3 N HCl solutions were mixed with 200 ml of 0.6 N H2SO4. The normality of H2SO4 in final solution is –

(a) 0.9 N                             (b) 0.6 N

(c) 0.5 N                                 (d) 0.4 N

12. Which of the following statements is inconsistent with the postulates of the kinetic theory of gases?

(a) Gases consist of large of the kinetic particles

(b) Molecules are in the state of content motion

(c) All the molecules have the same speed

(d) Pressure results from the impact of the molecules on the of the containing vessel

13. Which basic solution will have no solid residue after evaporation-

(a) Ca (OH) 2 (b) Na2CO3

(c) NH4OH                                                    (d) NaOH

14. Hydrogen diffuses five times as rapidly as another gas X. The molecular weight of the gas X should be –

(a) 10                                (b) 25

(c) 50                                   (d)      100

15. Which of the following substances isused as a fertilizer?

(a) K2SO4 Al2(SO4)3 24H2O

(b) Ca (H2PO4)2 H2O + CaSO4

(c) NaAlO2

(d) CaC2

16. The acid used in Lead strong battery is –

(a) Nitric acid

(b) Hydrochloric acid

(c) Phosphoric acid

(d) Sulphuric acid

17. Electrolytes dissociate into ions when dissolved in water. The degree of dissociation of an electrolyte –

(a) is independent of concentration

(b) increases with decreasing concentration of electrolyte

(c) decreases with decreasing concentration of electrolyte

(d) becomes 100 per cent at saturation solubility

18. If a copper wire is immersed in a solution of AgNO3. the colour of the solution becomes blue. Copper –

(a) forms a soluble complex with AgNO3

(b) is oxidized to Cu + +

(c) is reduced to Cu – –

(d) splits up into atomic form and dissolves

19. Sodium thiosulphate is used in photography –

(a) to darken the image

(b) to dissolve unchanged silver halide

(c) to convert silver halide to silver

(d) to convert silver into silver thiosulphate

20. An exothermic reaction is one in which –

(a) reacting substances have more energy than the products

(b) reacting substances have less energy than the products

(c) reacting substances have higher temperature than that of the products

(d) products are in excited sates

21. Which of the following substance is explosive?

(a) NH4Cl                        (b) NCl3

(c) HNO3 (d) Cl2

22. Element a (atomic weight 2/01) and element B (atomic weight 16) combine to form a new substance X. If two moles of B combine with one mole of A, then the weight of one mole of X is –

(a) 28.01 g                          (b) 44.01 g

(c) 49.02 g                            (d) 56.02 g

23. A flask of SO2 gas (mol. Wt. 64 1) was weighed at a measured temperature, and pressure. The flask was flushed and then filled with oxygen at the same temperature and pressure. The weight of SO2 gas will be about –

(a) the same as that of oxygen

(b) one fourth as heavy as the oxygen

(c) four times as heavy as the oxygen

(d) twice as heavy as the oxygen

24. Some of the properties of a system remain unchanged (i.e., conserved) even when the system undergoes a change. In a chemical change –

(a) molecules are conserved

(b) atoms are conserved

(c) moles are conserved

(d) none of these is conserved

25. A 50 litre closed vessel contains equal umbers of oxygen and of hydrogen molecules at a total pressure of 760 mm Hg. When oxygen is removed from the system.

(a) the pressure rises to 1520 mm Hg.

(b) the pressure drops to 380 mm Hg.

(c) the pressure does not change

(d) the volume is decreased

26. Elements in the first column of the Periodic Table are called alkali metals. These metals –

(a) have a single valency electron

(b) have one electron less than an inert gas configuration

(c) have tightly bond electrons in the crystal lattice

(d) have increasing melting points as atomic number goes up

27. Phosphorus exposed to the atmosphere burns spontaneously because –

(a) the reaction is endothermic

(b) the reaction is exothermic

(c) the activation energy is very low

(d) air contains some catalytic agent

28. Pure sodium chloride is precipitated when Hell gas is passed through a saturated solution of common salt because –

(a) HCl dissolves the impurities

(b) Chloride ions from aqueous hydrochloric acid lowers the solubility of sodium chloride.

(c) HCl is more soluble in water

(d) Sodium chloride does not react with hydrochloric acid

29. Acids are substances which can release hydrogen ions. In a neutral solution –

(a) There is a complete absence of hydrogen ions

(b) there is a complete absence of hydroxyl ions

(c) hydrogen and hydroxyl ions are both present in very small but equivalent amounts

(d) hydrogen and hydroxyl ions are both completely absent

30. Which one of the following statements would be true for both strongly acidic and strongly basic solutions?

(a) solution reacts with Mg to liberate hydrogen

(b) solution is a good conductor of electricity

(c) solution feels slippery

(d) solution tastes sour

31. Silver, mercury (ous) and lead (ous) are grouped together in a scheme of qualitative analysis because they form –

(a) soluble nitrates

(b) carbonates which dissolve in dil. HNO3

(c) insoluble chlorides

(d) colourless compounds

32. The action of hydrochloric acid on silver produces –

(a) a precipitate of silver chloride

(b) Chlorine gas

(c) no visible change

(d) a black stain on silver

33. Producer gas is used as a fuel and also as a source of nitrogen. The gases obtained by –

(a) passing steam over incandescent coke

(b) passing air through a bed of incandescent coke

(c) passing a mixture of steam and air over incandescent coke

(d) spraying oil into hot retorts

34. Anyhydrous aluminium chloride I obtained when –

(a) aluminium oxide reacts with hydrochloric acid

(b) aluminium reacts with hydrochloric acid solution

(c) aluminium is heated in a current of dry chlorine

(d) aluminium hydroxide reacts with aqueous hydrochloric acid

35. Hydrogen bromide is dried by passing the gas through –

(a) Quicklime

(b) P2O

(c) potassium hydroxide peallets

(d) concentrated sulphuric acid


Answer Sheet

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



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