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

31. What is the half life of the longest lived isotope of Francium?

[A] 1 minute
[B] 21 minute
[C] 21 hours
[D] 100 days

Show Answer

32. Which of the following is NOT correct about Group 14 elements?

[A] All of them are solids
[B] Melting points are much higher than those of corresponding elements of group 13
[C] Carbon is a non-metal
[D] Germanium is a metal

Show Answer

33. Which of the following statements is correct about Diborane?

[A] It is pink coloured gas
[B] It is a highly toxic gas
[C] Both a and b
[D] None

Show Answer

34. Which of the following is correct about Potassium carbonate?

[A] Its chemical formula is K CO3
[B] It is a salt which is white in colour
[C] It is used in the production of soap
[D] All of the above

Show Answer

35. Which of the following is the composition of vinegar?

[A] 65-75% solution of acetic acid in water
[B] 45-60% solution of acetic acid in water
[C] 28-35% solution of acetic acid in water
[D] 5-8% solution of acetic acid in water

Show Answer

36. Which of the following is NOT correct about Ethanol?

[A] It is a good solvent
[B] It gives out hydrogen when reacted with Sodium
[C] It is an odorless liquid
[D] All are correct

Show Answer

37. What do we call the compounds having identical molecular formula but different structures?

[A] Functional isomers
[B] Structural isomers
[C] Mirror isomers
[D] Branched isomers

Show Answer

38. Which of the following metal is alloyed with pure gold to make gold ornaments?

[A] Silver
[B] Copper
[C] Zinc
[D] All of the above

Show Answer

39. Which of the following is not a mixture?

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

Show Answer

40. 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

Show Answer

Advertisement

Kindly help us to keep GKToday updated and error free. Use this form to report error or outdated information in questions. We shall rectify asap...