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 represents the general formula for alkanes?

[A] CnH2n
[B] CnH2n-2
[C] CnH2n+2
[D] CnHn

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42. Which of the following is correct about Hydrazine?

[A] It is used in various rocket fuels
[B] Is chemical formula is N2 H2
[C] It is a blue colour liquid
[D] All of the above

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43. Which of the following is NOT correct about Phosphine?

[A] The chemical formula is PH3
[B] The electronic structure is like Ammonia
[C] It is odorless
[D] it is used as a dopant in semiconductor industries

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44. Which of the following is correct about ozone?

[A] it is a red coloured gas
[B] it is odourless
[C] it is harmless in small concentrations
[D] All of the above

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45. Which of the following compounds is prepared using Contact Process?

[A] Sulphuric Acid
[B] Nitric Acid
[C] Hydrochloric Acid
[D] Benzene

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46. 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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47. Which of these is NOT a compound of carbon?

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

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48. Which of the following defines the solubility of a solution?

[A] amount of the solvent present in the saturated solution
[B] amount of the solute present in the saturated solution
[C] amount of the solute per amount of solute in the solution
[D] difference of amount of solvent and the amount of solute

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49. 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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50. Which of the following is correct about suspension?

[A] It is a heterogeneous mixture
[B] The particles of a suspension can be seen by naked eyes
[C] The particles can be separated from the mixture by the process of filtration
[D] All of the above

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