|
(a) Distinguish between esterification and saponification reactions of organic compounds
|
|
1
|
2239
|
March 30, 2019
|
|
(a) What is vinegar? (b) Describe with a chemical equation what happens when sodium hydrogen carbonate reacts with ethanoic acid
|
|
1
|
2084
|
March 30, 2019
|
|
Give reasons for the following observations: 1. The element carbon forms a very large number of compounds
|
|
1
|
2749
|
March 30, 2019
|
|
1. Why are covalent compounds generally poor conductors of electricity?
|
|
1
|
3388
|
March 30, 2019
|
|
Give reasons for the followings: (i) Oxidation of ethanol with CrO3 produces ethanal while ethanol when oxidised with alkaline KMnO4, produces ethanoic acid
|
|
1
|
3647
|
March 30, 2019
|
|
What is meant by ‘dehydrating agent?
|
|
1
|
1548
|
March 30, 2019
|
|
Give reasons for the following : (i) A peculiar smell is observed near the preserved specimens in biology laboratory
|
|
1
|
1211
|
March 30, 2019
|
|
(i) Ethene reacts with bromine water. (ii) Ethanol burns in air
|
|
1
|
981
|
March 30, 2019
|
|
1. Write a chemical equation to show how ethanol can be converted into ethanoic acid
|
|
1
|
723
|
March 30, 2019
|
|
What are detergents? What change has been made in detergents to make them easily bio-degradable?
|
|
1
|
789
|
March 30, 2019
|
|
1. Write the chemical equation representing the preparation reaction of ethanol from ethene
|
|
1
|
2903
|
March 30, 2019
|
|
Write the formulae for the given compounds and names of the functional groups present in each of them:
|
|
1
|
583
|
March 30, 2019
|
|
A compound X is formed by the reaction of a carboxylic acid C2H4Oa and an alcohol in presence of a few drops of H2SO4
|
|
1
|
691
|
March 30, 2019
|
|
Explain esterification reaction with the help of a chemical equation. Describe an activity to show esterification
|
|
1
|
907
|
March 30, 2019
|
|
Write three different chemical reactions showing the conversion of ethanoic acid to sodium ethanoate
|
|
1
|
985
|
March 30, 2019
|
|
A carbon compound ‘P’ on heating with excess cone. H2SO4 forms another carbon compound
|
|
1
|
1380
|
March 30, 2019
|
|
What are hydrocarbons? Distinguish alkanes from alkenes and each of them from alkynes giving one example of each
|
|
1
|
5532
|
March 30, 2019
|
|
Write chemical equations to describe two examples of different oxidations of ethanol. List two uses of ethanol
|
|
1
|
2794
|
March 30, 2019
|
|
1. List two reasons for carbon forming a large number of compounds
|
|
1
|
5152
|
March 30, 2019
|
|
Define the term ‘structural isomerism’, Explain why propane cannot exhibit this property
|
|
1
|
4468
|
March 30, 2019
|
|
Write chemical equations for what happens when: (i) Sodium metal is added to ethanoic acid
|
|
1
|
1113
|
March 30, 2019
|
|
Write one chemical equation to represent each of the following types of reactions of organic substances:
|
|
1
|
867
|
March 30, 2019
|
|
(a) What is a homologous series of compounds? List any two of its characteristics?
|
|
1
|
4044
|
March 30, 2019
|
|
(i) Ethanol is heated with concentrated sulphuric acid at 443 K
|
|
1
|
711
|
March 30, 2019
|
|
An organic compound A of molecular formula C2H6O on oxidation with acidified potassium dichromate gives an acidic compound B
|
|
1
|
1454
|
March 30, 2019
|
|
Intake of small quality of methanol can be lethal. Comment
|
|
1
|
620
|
March 30, 2019
|
|
You have three unlabelled test tubes containing ethanol, ethanoic acid and soap solution
|
|
0
|
2897
|
March 18, 2018
|
|
Elements forming ionic compounds attain noble gas electronic configuration by either gaining or losing electrons from their valence shells
|
|
0
|
1533
|
March 18, 2018
|
|
Give a chemical test to distinguish between saturated and unsaturated hydrocarbons
|
|
0
|
5202
|
March 18, 2018
|
|
A salt X is formed and a gas is evolved when ethanoic acid reacts with sodium hydrogen- carbonate
|
|
0
|
5539
|
March 18, 2018
|