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What are the valence electrons ? For s-block and p-block elements show that number of valence electrons is equal to its group number.

asked Nov 17, 2021 in Chapter 7: Modern Periodic Table by Doubtly (98.9k points)

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Compare chemical properties of metals and non metals.

asked Nov 17, 2021 in Chapter 7: Modern Periodic Table by Doubtly (98.9k points)

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Explain : electronegativity and electron gain enthalpy. Which of the two can be measured experimentally?

asked Nov 17, 2021 in Chapter 7: Modern Periodic Table by Doubtly (98.9k points)

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Why the elements belonging to the same group do have similar chemical properties ?

asked Nov 17, 2021 in Chapter 7: Modern Periodic Table by Doubtly (98.9k points)

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Why the second ionization enthalpy is greater than the first ionization enthalpy ?

asked Nov 17, 2021 in Chapter 7: Modern Periodic Table by Doubtly (98.9k points)

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Explain the screening effect with a suitable example.

asked Nov 17, 2021 in Chapter 7: Modern Periodic Table by Doubtly (98.9k points)

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Ionization enthalpy of Li is 520 kJ mol-1 while that of F is 1681 kJ mol-1. Explain.

asked Nov 17, 2021 in Chapter 7: Modern Periodic Table by Doubtly (98.9k points)

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La belongs to group 3 while Hg belongs to group 12 and both belong to period 6 of the periodic table.

asked Nov 17, 2021 in Chapter 7: Modern Periodic Table by Doubtly (98.9k points)

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Complete the following table : Assign oxidation number to the underlined species and write Stock notation of compound Compound Oxidation number Stock notation

asked Nov 5, 2021 in Chapter 6: Redox Reactions by Doubtly (98.9k points)

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In which reaction does nitrogen exhibit variation of oxidation state from -3 to +5 ?

asked Nov 5, 2021 in Chapter 6: Redox Reactions by Doubtly (98.9k points)

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In which chemical reaction does carbon exibit variation of oxidation state from -4 to +4 ? Write balanced chemical reaction.

asked Nov 5, 2021 in Chapter 6: Redox Reactions by Doubtly (98.9k points)

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Write the formula for the following compounds : A. Mercury(II) chloride B. Thallium(I) sulphate C. Tin(IV) oxide D. Chromium(III) oxide

asked Nov 5, 2021 in Chapter 6: Redox Reactions by Doubtly (98.9k points)

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Predict the shape and bond angles in the following molecules: a. CF4 b. NF3 c. HCN d. H2 S

asked Oct 18, 2021 in Chapter 5: Chemical Bonding by Doubtly (98.9k points)

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Define : a. Bond Enthalpy b. Bond Length

asked Oct 18, 2021 in Chapter 5: Chemical Bonding by Doubtly (98.9k points)

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In case of bond formation in Acetylene molecule : a. How many covalend bonds are formed ?

asked Oct 18, 2021 in Chapter 5: Chemical Bonding by Doubtly (98.9k points)

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BF3 molecule is planar but NH3 pyramidal. Explain

asked Oct 18, 2021 in Chapter 5: Chemical Bonding by Doubtly (98.9k points)

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F-Be-F is a liner molecule but H-O-H is angular. Explain.

asked Oct 18, 2021 in Chapter 5: Chemical Bonding by Doubtly (98.9k points)

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Identify the type of orbital overlap present in a. H2 b. F2 c. H-F molecule. Explain diagramatically

asked Oct 18, 2021 in Chapter 5: Chemical Bonding by Doubtly (98.9k points)

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Which type of hybridization is present in ammonia molecule?

asked Oct 18, 2021 in Chapter 5: Chemical Bonding by Doubtly (98.9k points)

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Give reasons for: a. Sigma (σ)bond is stronger than Pi (π)bond. b. HF is a polar molecule

asked Oct 18, 2021 in Chapter 5: Chemical Bonding by Doubtly (98.9k points)

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