Check NDA Questions and Answers 1 – 20 here
21. Which of the following gases will rekindle a brightly glowing splint?
A. O2
B. NO
C. N2O
D. NO2
22. Which of the following mathematical relationship represent the first law of thermodynamics?
A. ΔU= q + w
B. ΔU = q – w
C. ΔH = u – p
D. ΔU = q-pv
23. If d represents the density of a gas and k is a constant, the rate of gaseous diffusion r is directly related to d by the equation.
A. r=Ikd
B. r= kd
C. rl = kd
D. r =kOd
24. Graphite conducts electricity because ___.
A. It contains an excess of electrons
B. It is crystalline
C. Its atoms are close together
D. Its electrons are localized
25. CO(g) + ½ O2(g) → CO2(g) ΔH= -285KJmol-1. What is the energy change in KJmol-1 for the reaction given above?( ΔH (CO) = -110.4KJmol-1, ΔH(CO2) = 393 KJmol-1)
A. -503.4 KJmol-1
B. +503.4 KJmol-1
C. -282.6 KJmol-1
D. +393.0 KJmol-1
26. The number of waves in n x 10th Bolur ‘s Orbit are __.
A. n3
B. n-2
C. n
D. n2
27. Which one of the following pairs of gases is the cause of occurrence of most of the explosion of mines?
A. Carbon dioxide and methane
B. Methane and Air
C. Oxygen and Acetylene
D. Hydrogen and Oxygen
28. The electronic configuration of excited carbon atom is __
A. 1s2 2s1 2px1 2py1 2pz1
B. 1s2 2s1 2p4
C. 1s2 2s2 2px1 2py1
D. 1s2 2s2 2p2
29. Which of the following processes is Iron being oxidized?
A. FeSO4 +H2S → FeS +H2sSO4
B. FeCl2 +H2SO4 → FeSO4 +2HCl
C. 2FeCl2 +SnCl2 +SnCl4
D. Fe + H2SO4 → FeSO4 + H2
30. The composition of gun powder is __.
A. 70% HN), 15% Charcoal and 15% Sulphur
B. 50% HNO3, 35% Charcoal and 15% Sulphur
C. 65% HNO3, 25% Charcoal and 10% Sulphur
D. 75% HNO3, 15% Charcoal and 10% Sulphur
31. The graph above demonstrates the effect of ___.
A. Concentration on the rate of reaction
B. Pressure on rate of reaction
C. Catalyst on the rate of reaction
D. Surface area on rate of reactant
32. In the Haber process for the manufacture of ammonia, the catalyst commonly used in a finely divided iron is used as ___.
A. Iron
B. Copper
C. Vanadium
D. Platinum
33. For the reaction 2H+ +Zn → H2 +Zn2+ ΔG = -147KJmol-1
What is the corresponding valve of EO cell ?
A. 0.76 V
B. -1.52 V
C. 1.52 V
D. -0.76 V
34. The number of oxygen atoms on 0.5 mole of KHSO4 is __.
A. 2.4 x 1024
B. 1.2 x 1023
C. 1.2 x 1024
D. 3.0 x 1023
35. The alkenes form a homogenous series of saturated hydrocarbons. They have a general molecular formula of __.
A. Cn H2n+2
B. Cn H3n+2
C. Cn H2n
D. CnH2n +1
36. Tin is unaffected by air at ordinary temperature due to its?
A. Weak electropositive Character
B. High boiling point
C. White lustrous appearance
D. Low melting point
37. In an electrochemical cell, polarization is caused by?
A. Tetra-oxosulphate (iv) acid
B. Oxygen
C. Hydrogen
D. Chlorine
38. PC I5(l) ⇋ PC I3(l) + Cl(2)(g) ΔH =+ve.
In the reaction above, the forward reaction is favoured by?
A. Increasing the temperature
B. Adding a catalyst
C. Increasing the pressure
D. Increasing the size of the containing vessel
39. On exposure to the atmosphere, a hydrated salt loses its water crystallization to become anhydrous. This phenomenon is referred to as__.
A. Deliquescence
B. Hygroscope
C. Hydrolysis
D. Efflorescence
40. In the diagram above, which of the curves illustrates Arrhenius law?
A. Z
B. Y
C. X
D. R
