To obtain an image of magnification M = − 1, the image must be real, inverted and of the same size as the object. This happens when the object is placed at twice the focal length of a convex lens. ...
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(i) Name of element ‘Z’: Aluminium (Al) (ii) Method of extraction: Aluminium is extracted from bauxite (Al₂O₃·2H₂O) by electrolytic reduction because it is highly reactive and cannot be reduced by carbon. The purified alumina is dissolved in molten cryolite (Na₃AlF₆) to ...
During the preparation of hydrogen chloride gas, the gas is usually passed through the guard tube containing calcium chloride during humid climate, as calcium chloride is a good drying agent and absorbs moisture from the gas. Tiwari Academy provides CBSE Class ...
The correct answer is [A] (ii) and (iv).‘A’ represents the diaphragm. During inhalation, it flattens and helps the chest cavity to become larger, allowing air to enter the lungs. It doesn’t decrease residual volume.
The correct answer is [B] Hydrochloric acid, Pepsin, Mucus. In the human alimentary canal, gastric glands of the stomach secrete hydrochloric acid to kill germs, pepsin to digest proteins, and mucus to protect stomach lining.