After replacement, bulb glows in B as NaOH solution contains Na⁺ and OH⁻ ions, which are responsible for electrical conductivity.

(i)Rainbow is caused by scattering of sunlight by tiny water droplets, present in the atmosphere. (ii) A rainbow is always formed in a direction opposite to that of the Sun. (iii) The water droplets refract and scatter the incident sunlight, ...

Class X Science MCQ Extra Questions Answers Class 10 Science Terminal Exams MCQ Solutions Class 10th Science Session 2022-23 10th Science Terminal Exam Based MCQ Extra Questions

As the student wants to show that carbon dioxide is essential for photosynthesis, he sealed both the bell jars with Vaseline (- petroleum product) and placed KOH in one bell jar as KOH absorbs CO₂ gas present in the bell ...

(i) Pb + CuCl₂ → PbCI₂ + Cu (ii) Na₂SO₄ + BaCl₂ → BaSO₄ + 2NACI (iii) C+ O₂ → CO₂ (iv) CH₄ + 20₂ → CO₂ + 2H₂ O