Share & grow the world's knowledge!
We want to connect the people who have knowledge to the people who need it, to bring together people with different perspectives so they can understand each other better, and to empower everyone to share their knowledge.
Mild non-corrosive basic salt is
The correct answer is (d) NaHCO₃ (sodium bicarbonate). Sodium bicarbonate (NaHCO₃), also called baking soda, is a mild and non-corrosive base. Unlike strong bases such as sodium hydroxide or calcium hydroxide, it does not cause harm to the skin. It is commonly used in baking, medicine (antacids), anRead more
The correct answer is (d) NaHCO₃ (sodium bicarbonate). Sodium bicarbonate (NaHCO₃), also called baking soda, is a mild and non-corrosive base. Unlike strong bases such as sodium hydroxide or calcium hydroxide, it does not cause harm to the skin. It is commonly used in baking, medicine (antacids), and cleaning, showing its safe and versatile basic nature.
See lessThe colour of the solution observed after 30 minutes of placing zinc metal to copper sulphate solution is (a) Blue (b) Colourless (c) Dirty green (d) Reddish Brown
When zinc metal is placed in blue copper sulphate solution, a displacement reaction occurs because zinc is more reactive than copper. Zinc displaces copper from its salt, forming zinc sulphate, which is colourless in solution. Copper gets deposited as a reddish-brown layer, while the solution losesRead more
When zinc metal is placed in blue copper sulphate solution, a displacement reaction occurs because zinc is more reactive than copper. Zinc displaces copper from its salt, forming zinc sulphate, which is colourless in solution. Copper gets deposited as a reddish-brown layer, while the solution loses its blue colour. Hence, the correct answer is (b) Colourless.
See lessStudy the diagram given below and answer the questions: (i) Name the defect of vision represented in the diagram. (ii) Redraw the diagram and show how a corrective lens resolves this defect? Label the lens type and focal point.
(i) Defect: Myopia (nearsightedness) — image forms in front of the retina because the eye’s lens is too strong (focal length too short) or the eyeball is too long. (ii) Correction: use a concave (diverging) lens placed in front of the eye. It diverges incoming parallel rays so the eye’s lens then foRead more
(i) Defect: Myopia (nearsightedness) — image forms in front of the retina because the eye’s lens is too strong (focal length too short) or the eyeball is too long.
(ii) Correction: use a concave (diverging) lens placed in front of the eye. It diverges incoming parallel rays so the eye’s lens then focuses them on the retina.
See lessStudy the ray diagram of an object placed in front of a lens. (i) Write three characteristics of the image formed? (ii) In which position of the object will the magnification be – 1?
(i) From the ray diagram, the image formed is real, inverted, and diminished because the object is placed beyond 2F₁ of a convex lens. (ii) The magnification will be –1 when the object is placed at 2F₁, as then the image is formed at 2F₂, real, inverted, and of the same size as the object.
(i) From the ray diagram, the image formed is real, inverted, and diminished because the object is placed beyond 2F₁ of a convex lens.
(ii) The magnification will be –1 when the object is placed at 2F₁, as then the image is formed at 2F₂, real, inverted, and of the same size as the object.
See lessAssertion (A): Magnetic field never intersects each other. Reason (R): If two magnetic field lines intersect, it would imply two different directions of the magnetic field at that point.
ANSWER: [A] Explanation: Assertion (A) states that magnetic field lines never intersect, which is true. Reason (R) correctly explains this, as intersection would mean two directions of the magnetic field at one point, which is impossible. Hence, both A and R are true, and R is the correct explanatioRead more
ANSWER: [A]
Explanation: Assertion (A) states that magnetic field lines never intersect, which is true. Reason (R) correctly explains this, as intersection would mean two directions of the magnetic field at one point, which is impossible. Hence, both A and R are true, and R is the correct explanation of A.
See less