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DSSSB TGT Classification of Elements and Periodicity — practice questions — page 2

Explore 82 free Classification of Elements and Periodicity questions in DSSSB TGT Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Classification of Elements and Periodicity questions and exercises with answers

Showing questions 31–60 of 82.

Which set lists representative elements (s-block and p-block) only?Read the answer and worked solution →Which pair shows the diagonal relationship in the periodic table?Read the answer and worked solution →Across period 3, which element forms the most acidic oxide?Read the answer and worked solution →Why is potassium more reactive than sodium?Read the answer and worked solution →How does the size of a cation compare with its parent atom?Read the answer and worked solution →Which is the most non-metallic element of group 16?Read the answer and worked solution →Why are the noble gases very stable chemically?Read the answer and worked solution →Mendeleev predicted the existence of an element he called eka-silicon, later identified as:Read the answer and worked solution →Upto which element, the Law of Octaves was found to be applicableRead the answer and worked solution →According to Mendeleev's Periodic Law, the elements were arranged in the periodic table in the order ofRead the answer and worked solution →Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?Read the answer and worked solution →An element which is an essential constituent of all organic compounds belongs toRead the answer and worked solution →Which of the following is the outermost shell for elements of period 2?Read the answer and worked solution →Which one of the following elements exhibit maximum number of valence electrons?Read the answer and worked solution →Which of the following gives the correct increasing order of the atomic radii of O, F and N?Read the answer and worked solution →Which among the following elements has the largest atomic radii?Read the answer and worked solution →Which of the following elements would lose an electron easily?Read the answer and worked solution →Which of the following elements does not lose an electron easily?Read the answer and worked solution →Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl, Mg, AlRead the answer and worked solution →Arrange the following elements in the order of their increasing non-metallic character Li, O, C, Be, FRead the answer and worked solution →What type of oxide would Eka-aluminium form?Read the answer and worked solution →Three elements B, Si and Ge areRead the answer and worked solution →Which of the following elements will form an acidic oxide?Read the answer and worked solution →Which one of the following does not increase while moving down the group of the periodic table?Read the answer and worked solution →On moving from left to right in a period in the periodic table, the size of the atom.Read the answer and worked solution →Which of the following set of elements is written in order of their increasing metallic character?Read the answer and worked solution →Order the atomic models as they were proposedRead the answer and worked solution →Match each scientist to their modelRead the answer and worked solution →Match each model to what it could NOT explainRead the answer and worked solution →True or false: Rutherford's modelRead the answer and worked solution →

Worked practice questions

Which set lists representative elements (s-block and p-block) only?

  1. Ce, Pr, Nd, Pm
  2. Fe, Co, Ni, Cu, Zn
  3. Na, Mg, Al, Si, P, S, Cl
  4. Sc, Ti, V, Cr, Mn
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Correct answer: C. Na, Mg, Al, Si, P, S, Cl

1. Representative elements are in the s and p blocks (groups 1, 2 and 13-18). 2. Na, Mg are in Group 1 and 2 (s-block). 3. Al, Si, P, S, Cl are in the p-block of period 3. 4. Fe, Co, Ni etc. are transition (d-block) elements. 5. Ce, Pr etc. are inner transition (f-block) elements. 6. So only option A lists representative elements. _Source: syllabus Science Ch 5 'Periodic Classification of Elements'_

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Which pair shows the diagonal relationship in the periodic table?

  1. Li and Mg
  2. Na and K
  3. O and S
  4. F and Cl
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Correct answer: A. Li and Mg

1. Diagonal relationship pairs elements diagonally across the table. 2. Such pairs share similar properties despite being in different groups. 3. Lithium (Group 1, period 2) and magnesium (Group 2, period 3) are a classic example. 4. They form similar compounds (e.g. Li3N and Mg3N2). 5. Na-K and F-Cl are same-group pairs, not diagonal. 6. So Li and Mg is the diagonal pair. _Source: syllabus Science Ch 5 'Periodic Classification of Elements'_

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Across period 3, which element forms the most acidic oxide?

  1. Sodium
  2. Sulphur
  3. Aluminium
  4. Magnesium
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Correct answer: B. Sulphur

1. Period 3 starts with metals (Na, Mg, Al) and ends with non-metals. 2. Oxides go from basic to acidic across the period. 3. SO3 (the oxide of sulphur) is a strongly acidic oxide. 4. It dissolves in water to give H2SO4, a strong acid. 5. So sulphur forms the most acidic oxide of those listed. 6. Chlorine oxide is more acidic still but is not in the options. _Source: syllabus Science Ch 5 'Periodic Classification of Elements'_

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