(i) copper displace iron (ii) blue colour of copper sulphate solution is obtained (iii) reaction is exothermic (iv) no reaction takes place

When silver chloride, AgCl is placed in sunlight for some time, then silver chloride changes into grey coloured silver metal & chlorine gas. 2AgCl (s) + Sunlight → 2Ag(s) + Cl₂ (s)

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

All of colours of light do not travel with same speed in the medium. The various colours of white light have different extent of refraction in a medium which is the cause of dispersion of light.

Ozone layer depletion causes increased incidence of ultraviolet radiations on the surface of the earth and this causes skin cancer, cataract and other eye damage. Tides are caused due to the gravitational pull of the moon on the earth, not ...

During the refraction of light wavelength and speed change. Frequency is always a constant quantity.

(i) It is present only in troposphere. (ii) It is present in very small quantities in stratosphere. (iii)It can be beneficial or harmful, depending upon its location and concentration. (iv) It shields the surface of the earth from ultraviolet (UV) ...

Sodium and potassium react violently with the release of huge amount of heat. So the reaction is highly exothermic. Hydrogen gas which is produced during the reaction catches fire. Calcium reacts less violently with water. The heat evolved is not ...

Metals react with water to produce metal oxide and hydrogen gas. Metal oxides that are soluble in water, dissolve in water to form metal hydroxide.

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