Recent activity in Class X Science

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Write the structural formula of ethanol. What happens when it is heated with an excess of conc. H2SO4 at 443 K ?

answer edited 2 days ago in Class X Science by 10messi10 Basic (28 points)

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What happened when ethanol is heated with excess concentrated H2 S o4 at 443 k

answered 2 days ago in Class X Science by 10messi10 Basic (28 points)

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Ethene and ethane.

answer edited Feb 9 in Class X Science by priya12 (-10,168 points)

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describe how hydro-energy can be converted into electrical energy . write any two limitations for hydro-energy

asked Feb 4 in Class X Science by SAKSHI JAJOO (15 points)

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What are Hydrocarbons

answered Feb 1 in Class X Science by Sachin Mishra Basic (24 points)

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Zinc sulphate solution and Zinc chloride solution.

answered Feb 1 in Class X Science by muskan15 (-1,491 points)

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Sodium hydroxide solution is added first in a small quantity, then in excess to the aqueous salt solutions of copper (II) sulphate

answered Feb 1 in Class X Science by muskan15 (-1,491 points)

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Salts A, B, C, D and E undergo reactions (i) to (v) respectively.

answered Feb 1 in Class X Science by muskan15 (-1,491 points)

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Mandeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. Name the elements which have taken the place of these elements

answered Jan 31 in Class X Science by SD Basic (36 points)

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Identify the cations and anions in each case and write relevant equations wherever necessary.

answered Jan 31 in Class X Science by muskan15 (-1,491 points)

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State the colour of the following :

answered Jan 31 in Class X Science by Payal Dahiya Basic (44 points)

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Identify the following solids.

answered Jan 31 in Class X Science by muskan15 (-1,491 points)

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A white crystalline solid A on dissolving in water forms a neutral solution. When solid A is heated with calcium hydroxide, it gives off colourless gas B having a sharp biting smell.

answered Jan 31 in Class X Science by muskan15 (-1,491 points)

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The questions (i) to (v) refer to the following salt solutions listed A to F:

answered Jan 31 in Class X Science by muskan15 (-1,491 points)

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Select from the list given (A to E) one substance in each case which matches the description given in parts (i) to (v).

answered Jan 31 in Class X Science by muskan15 (-1,491 points)

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Identify the substances P, Q, R, S and T in each case based on the information given below:

answered Jan 31 in Class X Science by muskan15 (-1,491 points)

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Identify the anion present in the following compounds :

answered Jan 31 in Class X Science by muskan15 (-1,491 points)

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Mention the colour changes observed when the following indicators are added to acids :

answered Jan 31 in Class X Science by muskan15 (-1,491 points)

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Name the three ions which can be identified by K4[Fe(CN)6] solution.

answered Jan 31 in Class X Science by muskan15 (-1,491 points)

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Give the correct IUPAC name structural formulae given below:

answered Jan 31 in Class X Science by navnit40 (-1,199 points)