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Indian Navy SSR (Sailor) Chemistry — practice questions

Explore 3 free Chemistry questions in Indian Navy SSR (Sailor) Science. Open each question or exercise to read its content, reference answers and available explanation.

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Chemistry questions and exercises with answers

Showing questions 1–3 of 3.

The pH value of pure water is:Read the answer and worked solution →The chemical name of which substance is calcium sulphate hemihydrate?Read the answer and worked solution →Name the process in which a metal is attacked by surrounding substances such as moisture, acids, etc.Read the answer and worked solution →

Worked practice questions

The pH value of pure water is:

  1. Less than 7
  2. More than 7
  3. Equal to 7
  4. Equal to 0
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Correct answer: C. Equal to 7

1. pH measures acidity or alkalinity on a 0 to 14 scale. 2. Pure water is neutral, neither acidic nor basic. 3. The neutral point is pH 7, so pure water has pH equal to 7. _Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.34._

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The chemical name of which substance is calcium sulphate hemihydrate?

  1. Baking powder
  2. Plaster of Paris
  3. Gypsum
  4. Baking soda
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Correct answer: B. Plaster of Paris

1. Plaster of Paris has the formula CaSO4 . (1/2)H2O. 2. This is calcium sulphate hemihydrate. 3. So the correct answer is Plaster of Paris. _Source: RRB Group D CEN-02/2018 PYQ, Q.82._

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Name the process in which a metal is attacked by surrounding substances such as moisture, acids, etc.

  1. Oxidation
  2. Corrosion
  3. Rancidity
  4. Reduction
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Correct answer: B. Corrosion

1. The gradual destruction of a metal by surrounding moisture, air and acids is a specific process. 2. Rusting of iron is a common example of this. 3. This process is called corrosion. _Source: RRB Group D CEN-02/2018 PYQ, Q.91._

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More Science topics

Science & TechnologyMetals and Non-metalsAcids, Bases and SaltsAcids Bases SaltsChemical Reactions and EquationsElectricityPhysicsCarbon and its Compounds