Write one method each for the laboratory preparation of dihydrogen from I) mineral acid ii) aqueous alkali. Which is the product in this reaction?

Write one method each for the laboratory preparation of dihydrogen from I) mineral acid ii) aqueous alkali. Which is the catalyst used for the reaction?

Chlorine is prepared in the laboratory by treating manganese dioxide (MnO_2) with aqueous hydrochloric acid according to the reaction?

Write a method to prepare Glucose from starch. Write the chemical equation of the reaction.

Give possible explanation fòr each of the following: i. Cyclohexanone forms cyanohydrin in good yield but 2,2,6 -trimethylcyclohexanone does not. ii. There are two -NH_2 groups in semicarbazide. However, only one is involved in the formation of semicarbazones. iii. During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the ester should be removed as soon as it is formed.

Note the chemical reactions given below. i) nCH_(2)=CH-Clrarr[-CH_(2)CH-Cl]_(n) ii) CH_(2)=CH_(2)+Cl_(2)rarrCH_(2)Cl-CH_(2)Cl iii) CH_(3)COOH+OH-CH_(2)CH_(3)rarrCH_(3)COOCH_(2)CH_(3)+H_(2)O a) Identify the polymerisation reaction. b) From the products of three reactions given, find out ethyl ethanoate. c) Give the products of reaction if HCl is used instead of Cl_(2) in reaction(ii)

Ethyl acetate is formed by the reaction between ethanol and acetic acid and equilibrium is represented as: 'CH_3 COOH_( )+C_2 H_5 OH_(l) hArr CH_3 COOC_2 H_5_(l)+H_2 O_(l)' i) Write the concentration ratio (reaction quotient), 'Q_c', for this reaction (note: water is not in excess and is not a solvent in this reaction) ii) At '293 K', if one starts with '1.00' mol of acetic acid and '0.18 mol' of ethanol, there is '0.171' mol of ethyl acetate in the final equilibrium mixture. Calculate the equilibrium constant. iii) Starting with '0.5' mol of ethanol and '1.0' mol of acetic acid and maintaining it at 293 ' K, '0.214' mol of ethyl acetate is found after sometime. Has equilibrium been reached?

Chlorine is prepared in the laboratory by treating manganase dioxide( MnO_2 ) with aqueous hydrochloric acid according to the reaction, 4HCl(aq)+MnO_2(s) to 2H_2O(l)+MnCl_2(aq)+Cl_2(g). How many grams of HCl react with 5.0 g of manganese dioxide?