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Delhi Police SI Chemistry — practice questions

Explore 22 free Chemistry questions in Delhi Police SI 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 1–22 of 22.

The pH value of pure water is:Read the answer and worked solution →Protium, deuterium and tritium are all forms (isotopes) of which element?Read the answer and worked solution →Which of the following elements is NOT a noble gas?Read the answer and worked solution →For galvanizing iron, which of the following metals is used?Read the answer and worked solution →In the Modern Periodic Table, the position of which element is anomalous as it can be placed in either group 1 or group 17?Read the answer and worked solution →One way of dating fossils is by detecting the ratio of different ____ of the same element in the fossil material.Read the answer and worked solution →In which classification are the elements arranged in the order of their increasing atomic number?Read the answer and worked solution →Which allotrope of carbon exists in the form of a geodesic globe?Read the answer and worked solution →The chemical name of which substance is calcium sulphate hemihydrate?Read the answer and worked solution →Which is the least reactive element belonging to group 17?Read the answer and worked solution →Which of the following metals has low density and a low melting point?Read the answer and worked solution →Who is credited with inventing the periodic table of elements?Read the answer and worked solution →What is the atomic mass of Calcium?Read the answer and worked solution →When a metal reacts with water, which gas is released?Read the answer and worked solution →Who proposed the word 'atom'?Read the answer and worked solution →Substances whose odour changes in acidic or basic media are called:Read the answer and worked solution →Tungsten's melting point is approximately:Read the answer and worked solution →Which of the following metals is in liquid state at room temperature?Read the answer and worked solution →Which of the following elements could not find a fixed place in Mendeleev's periodic table?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 →Place each element in its groupRead the answer and worked solution →Knock out the false chemistry linesRead 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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Protium, deuterium and tritium are all forms (isotopes) of which element?

  1. Helium
  2. Nitrogen
  3. Carbon
  4. Hydrogen
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Correct answer: D. Hydrogen

1. Isotopes are atoms of the same element with different numbers of neutrons. 2. Protium, deuterium and tritium each have one proton. 3. An atom with one proton is hydrogen, so they are isotopes of hydrogen. _Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.35._

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Which of the following elements is NOT a noble gas?

  1. Bromine
  2. Neon
  3. Helium
  4. Krypton
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Correct answer: A. Bromine

1. Noble gases occupy Group 18 of the periodic table. 2. Neon, helium and krypton are all noble gases. 3. Bromine is a halogen (Group 17), so it is not a noble gas. _Source: RRB Group D (RRC) PYQ, held 27-10-2013, Q.80._

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