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The energy required to remove an electron from a neutral isolated gaseous atom and convert it into a positively charged gaseous ion is called ____________. (electron affinity, ionization potential, electronegativity)

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The compound that does not have a lone pair of electrons is __________.(water, ammonia, carbon tetrachloride)

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When a metallic oxide is dissolved in water, the solution formed has a high concentration of ____________ ions (H⁺, H₃O⁺, OH^-)

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Potassium sulphite on reacting with hydrochloric acid releases _______gas. Cl₂, SO₂, H₂S)

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The compound formed when ethene reacts with Hydrogen is ________.(CH₄, C₂H₆, C₃H₈)