ICSE Class 8 Hydrogen — practice questions
20 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice ICSE Class 8 Hydrogen in the app →Hydrogen was first prepared in 1672 byLavoisier named the gas 'hydrogen' because itHydrogen has the molecular formulaHydrogen is the most abundant element in theIn a chemical reaction, very active metals like sodium react withThe most important compound of hydrogen on Earth isIn the laboratory, hydrogen is prepared by the action ofWhy is concentrated H2SO4 not used to prepare hydrogen in the laboratory?Why is nitric acid (HNO3) not used to prepare hydrogen in the lab?Hydrogen gas is collected over water because it isHydrogen burns in air with aWhen a mixture of hydrogen and oxygen is sparked, the reaction isHydrogen is used in industry mainly forHydrogenation of vegetable oils producesHydrogen is regarded as the fuel of the future becauseWhen hot magnesium metal is heated with steam, the gas evolved isWhen iron is heated with steam at very high temperature, the products areHydrogen reduces hot copper(II) oxide to giveWhy is hydrogen filled in weather balloons rather than helium in many cases?Hydrogen has valency 1 because its atom has