General Science - Chemistry

31. Choose the correct order of these elements in terms of abundance in the earth’s crust:
[A] Iron > Silicon > Oxygen >Aluminium
[B] Oxygen > Silicon > Aluminium > Iron
[C] Oxygen> Iron > Aluminium > Silicon
[D] Iron > Aluminium > Silicon > Oxygen

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32. Choose the incorrect ‘Metal -ore’ pair:
[A] Iron – Magnetite
[B] Aluminium – Bauxite
[C] Gold – Calaverite
[D] Calcium – Carnalite

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33. Which of the following minerals contain mercury?
[A] Cinnabar
[B] Corderoite
[C] Livingstonite
[D] All of the above

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34. Choose the correct statement about Hydraulic Washing:
[A] It is used for concentration of ores
[B] It is based on differences in magnetic properties of the ore components
[C] Both a and b
[D] None of the above

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35. Which of the following is correct about Roasting?
[A] the ore is heated in a regular supply of air
[B] It is used to convert the concentrated ore to oxide
[C] it is commonly used for suiphide ores
[D] All of the above

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36. What is the relation between mass and wavelength of any matter, as per de Broglie’s relation?
[A] Both are directly proportional
[B] Both are inversely proportional
[C] Both are independent of each other
[D] wavelength is twice the square of the mass

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37. Which of the following characteristic of an electron is impossible to determine simultaneously, as per Heisenberg’s Uncertainty Principle?
[A] exact charge and exact velocity
[B] exact charge and exact mass
[C] exact position and exact momentum
[D] exact mass and exact position

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38. Which of the following statements related to principal quantum number (n) is not correct?
[A] Energy of the orbital increases with increase of n
[B] Size of an orbital increases with increase of n
[C] The shell M is represented by principal quantum number 2
[D] Total number of allowed orbitals in Shell K is 1

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39. Which of the following quantum number is also known as orbital angular momentum?
[A] Principal quantum number
[B] Azimuthal quantum number
[C] Magnetic quantum number
[D] Electron spin quantum number

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40. Which of the following quantum numbers is not necessary to identify an orbital?
[A] Principal quantum number
[B] Azimuthal quantum number
[C] Magnetic quantum number
[D] Electron Spin quantum number

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