Why is Ferric chloride preferred over Potassium Chloride in case of a cut leading to bleeding?
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Expand ‘ELISA’. Why is this method preferred over conventional methods of diagnosis of diseases,?
Enzyme Linked Immunosorbent Assay Infection by pathogen detected by the presence of antigens (protein , glycoprotein etc.) antibodies synthesised against the pathogen , Conventional methods cannot provide early diagnosis which is made possible...
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What happens in the following activities and why? (i) An electrolyte is added to a hydrated ferric oxide sol in water.
(i) The positively charged colloidal particles of Fe(OH)3 get coagulated by the negatively charged ions provided by electrolyte. (ii) The path of light becomes visible due to scattering of light by...
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In which of the following forms is iron absorbed by plants ? (1) Ferric (2) Ferrous (3) Free element (4) Both ferric and ferrous
Iron absorbed by plants is Ferric
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Why is air travel preferred in the north-eastern states of India? Explain.
Air Transport is considered as an important means of transport in the North-Eastern part of our country because: (i) Big rivers: Presence of big rivers like the Brahmaputra make it...
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Assertion (A): In the reaction between potassium permanganate and potassium iodide, permanganate ions act as oxidizing agent
(c)A is true but R is False
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On heating, potassium chlorate decomposes to potassium chloride and oxygen. In one experiment 30g of potassium chlorate generates 14.9g
(a) 2KCIO3→2KCI + 3O2 30g 14.9g 9.6g Suppose mass of under composed KCIO3 = xg According to law of conservation of mass the total mass...
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Why was Bombay handed over to the British by the Portuguese? (a) The Portuguese handed it over to the British after a peace-treaty in Europe
(b) The marriage of Charles II with The Portuguese princes Catherine of Braganza
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Classify the following salts into acidic, basic and neutral- Potassium sulphate, ammonium chloride, sodium carbonate, sodium chloride.
Neutral Salts :Potassium sulphate, sodium chloride Basic Salts: Sodium carbonate Acidic Salts: Ammonium chloride
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List-I List-II A. Prafulla Chaki 1. Lahore Conspiracy case B. Sukhdev 2. Kakori case C. Ashfaqullah Khan 3. Chittagong armoury raid case
(b) 4 1 3 2
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Lithium, sodium and potassium form a Dobereiner's triad. The atomic masses of lithium and potassium are 7 and 39 respectively.
Atomic mass of Na=7+39/2=46/2=23
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