Chemistry - Chemistry in Everyday life

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Question - 1

Which one of the following is correct? Setting of Plaster of Pairs is

  • A dehydration
  • B oxidation with atmospheric oxygen
  • C hydration leading to another hydrate
  • D combination with atmospheric carbon dioxide

Question - 2

Which of the following pairs of chemical compounds has the potential for carbon capturing by chemical process to reduce the global warming?

  • A Potassium oxide and sodium oxide
  • B Magnesium oxide and calcium oxide
  • C Magnesium oxide and potassium oxide
  • D Calcium oxide and potassium oxide

Question - 3

The pH of fresh milk is 6. when it turns sour, the pH

  • A becomes < 6
  • B remains the same, i.e., 6
  • C becomes > 6
  • D becomes neutral, i.e., 7

Question - 4

When the fats are reached with alkali, they form 'soaps'. The type of reaction taking place in the formation of soaps is called

  • A emulsification
  • B saponification
  • C halogenation
  • D oxidation

Question - 5

Aquaregia used by alchemist to separate silver and gold is a mixture of

  • A concentrated HNO3 and concentrated H2SO4
  • B concentrated HCL and concentrated H2SO4
  • C concentrated HNO3 and concentrated HCL
  • D dilute HNO3 and dilute HCL

Question - 6

Consider the following statements
1. A chalcogenide glass is a glass containing sulphur, selenium or tellurium.
2. Chalcogenide glass form the basis of re-writable CD and DVD solid-state memory technology.
Which of the statement(s) given below is/are correct?

  • A Only 1
  • B Only 2
  • C Both 1 and 2
  • D Neither 1 nor 2

Question - 7

'Misch metal' is widely used in the manufacture of which of the following?

  • A Material of car break
  • B Smoke detectors
  • C Cigarette lighter
  • D Emergency light

Question - 8

Commercially vulcanisation of rubber involves

  • A sulphur
  • B carbon
  • C phosphorus
  • D selenium

Question - 9

Nail polish remover contains

  • A benzene
  • B formaldehyde
  • C acetic acid
  • D acetone

Question - 10

Burning of fossil fuels is the main source of which of the following pollutants?

  • A CFCs
  • B Carbon monoxide
  • C Sulphur dioxide
  • D Particulate matter
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