General Science - Chemistry

41. Which of the following quantum numbers give information about the spatial orientation of the orbital with respect to standard set of co-ordinate axis?
[A] Azimuthal quantum number
[B] Principal quantum number
[C] Magnetic quantum number
[D] Electron spin quantum number

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42. What do we call the region where the probability density function reduces to zero?
[A] shells
[B] orbits
[C] nodes
[D] None of the above

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43. Which of the following is correct about effective nuclear charge experienced by the orbital?
[A] it increases with increase of azimuthal quantum number
[B] it increases with increase of magnetic quantum number
[C] it decreases with increase of azimuthal quantum number
[D] It is same everywhere

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44. What will be the number of neutrons in an atom having atomic number 35 and mass number 80?
[A] 35
[B] 45
[C] 55
[D] 80

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45. Which of these species are isoelectronic?
[A] Al+ , B
[B] Mg+ , Cu
[C] Na+ , Al
[D] Na+ , F

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46. What is Zeeman effect?
[A] splitting of spectral line in presence of magnetic field
[B] splitting of spectral line in presence of electric field
[C] convergence of spectral line in presence of magnetic field
[D] convergence of spectral line in presence of electric field

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47. What do we call the ratio of number of fission produced by a given generation of neutrons to the number of fission of the preceding generation?
[A] Critical factor
[B] Energy factor
[C] Multiplication factor
[D] Moderation factor

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48. Which of the following is emitted in alpha decay?
[A] Helium nucleus
[B] Hydrogen nucleus
[C] Electrons
[D] Carbon nucleus

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49. Which of the following is an endothermic reaction?
[A] Decomposition of calcium carbonate to calcium oxide and carbon dioxide
[B] Respiration
[C] Burning of Natural gas
[D] All of the above

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50. Which of the following reactions represents changing of green colour of ferrous sulphate?
[A] Double Displacement reaction
[B] Displacement reaction
[C] Combination reaction
[D] Decomposition reaction

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