Question 1MCQ · Analyse · 1 mark
Carbon Compounds · Soaps and detergents
A student gets little lather and a white scum when soap is shaken with hard water. What is the best explanation?
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CBSE Class 10 Science Competency Based Questions
Practise original CBSE Class 10 Science competency based questions across all 13 chapters, with MCQs, assertion-reason, case studies, answers and worked solutions for Physics, Chemistry and Biology.
Question 2MCQ · Analyse · 1 mark
Carbon Compounds · Saturated and unsaturated compounds
An unknown hydrocarbon rapidly decolourises bromine water in a standard addition test without sunlight. Which of these could it be?
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Question 3MCQ · Analyse · 1 mark
Carbon Compounds · Homologous series
Methanol, CH₃OH, and ethanol, C₂H₅OH, are adjacent members of a homologous series. What is the molecular formula of the next member?
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Question 4MCQ · Analyse · 1 mark
Carbon Compounds · Ethanol and ethanoic acid
Which observation can distinguish aqueous ethanoic acid from ethanol in a school laboratory?
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Chapter-wise Science competency questions
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