General Science Chemistry MCQs

Chemistry Objective (Multiple Choice) General Knowledge Questions & Answers for SSC-CGL, UPPSC, UPSC, NDA, CDS and UPSC Civil Services Prelims Examination

41. Which of the following is correct about HCl gas?

[A] It is a colourless and pungent smelling gas
[B] It is extremely soluble in water
[C] Both a and b
[D] None

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42. Which of these is NOT a compound of carbon?

[A] Acetic acid
[B] Chloroform
[C] Caustic Soda
[D] Methane

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43. Which of the following is not a mixture?

[A] Ocean water
[B] Table salt
[C] Air
[D] Soil

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44. Which of the following is not the correct way of expressing the concentration of a solution?

[A] (Mass of solute/Mass of solution) x 100
[B] (Volume of solute/Volume of solution) x 100
[C] (Mass of solute/Volume of solution) x 100
[D] (Volume of solvent/Volume of solution) x 100

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45. Which of the following is correct?

[A] A colloidal solution is a heterogeneous mixture
[B] A colloidal solution is a homogeneous mixture
[C] The particles of a colloidal solution cannot scatter beam of light
[D] None of the above

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46. Which of the following techniques can be used to separate cream from milk?

[A] Filtration
[B] Distillation
[C] Centrifugation
[D] Chromatography

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47. Which method will is most suitable to separate the mixture of ammonium chloride and salt?

[A] Evaporation
[B] Sublimation
[C] Simple Distillation
[D] All of the above

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48. What is an alloy of mercury with some other metal generally known as?

[A] Galinston
[B] Amalgam
[C] Megalium
[D] Yellow metal

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49. Choose the incorrect statement:

[A] Epsom salt is an ore containing Sodium
[B] Bauxite is an ore of Aluminium
[C] Asbestos is an ore containing Calcium
[D] Milarite mineral contains Nickel

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50. Which of the following is / are correct statements about Roasting?

  1. In Roasting, the ore is heated in a regular supply of air
  2. Roasting is used to convert the concentrated ore to oxide
  3. Roasting is commonly used for sulphide ores

Select the correct option from the codes given below:

[A] Only 1 & 2
[B] Only 2 & 3
[C] Only 1 & 3
[D] 1, 2 & 3

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