Posts Tagged ‘aissce’

How was CBSE Chemistry Exam 2016?

How was the CBSE Chemistry exam 2016?

It was reported by various agencies that this year’s (2016) exam was the toughest compared to last 5 years question paper. Is it true? Was the question paper really a hard nut?IMG-20160310-WA0005

How much do you expect in   CBSE Chemistry theory paper?

Subscribe by Email

Be the first to comment - What do you think?  Posted by admin - March 9, 2016 at 1:13 pm

Categories: AISSCE CHEMISTRY   Tags: , , ,

Advantages of synthetic detergents over soaps

Synthetic detergents have several advantages over soaps.

  1. Synthetic detergents can be used even in hard water whereas some of the soap gets wasted if the water is hard.
  2. Synthetic detergents can be used even in acidic medium as they are the salts of strong acids and are not decomposed in acidic medium.
  3. Synthetic detergents have a stronger cleansing action than soaps.
  4. Synthetic detergents  are more soluble in water than soaps.
  5. Synthetic detergents are prepared from the hydrocarbons obtained from petroleum. This saves vegetable oils which are otherwise used for making soaps

Be the first to comment - What do you think?  Posted by admin - February 12, 2014 at 9:06 pm

Categories: AISSCE CHEMISTRY, CBSE Chemistry, CHEMISTRY IN EVERYDAY LIFE   Tags: , , , ,

How was your AISSCE (CBSE) Chemistry Question Paper 2012?

How was AISSCE Chemistry Question Paper 2012?

  • Was the Board question paper 2012 for Chemistry up to the standard?
  • Were there any questions out of syllabus?
  • Was any of the questions too tough?
  • Were there any unexpected questions?
  • How was the numerical problems?
  • Did you get sufficient time to answer the questions?

Please post your response soon. Your responses on AISSCE Chemistry Question Paper 2012 can affect the marking/ evaluation and eventually the marks. Comment honestly

86 comments - What do you think?  Posted by admin - March 13, 2012 at 10:51 am

Categories: AISSCE CHEMISTRY, CBSE Chemistry, Complaints   Tags: , , , , ,

Supplementary Textual Material in Chemistry for Class XII Supplied by CBSE

CBSE published some supplementary textual material earlier this year for Class XII Chemistry. In case if you have not downloaded them, please do it now. We have given below the abridged portion of the supplimentary study material.

The major portion is  from

Unit 16: Chemistry in Everyday Life – ANTIOXIDANTS

Antioxidants are one of the important and necessary food additives. These compounds retard the action of oxygen on food thus reducing its speed of decomposition by oxidation. Hence they help in the preservation of food. These act as sacrificial materials, i.e. these are more reactive towards oxygen than are the materials they are protecting. They also reduce the rate of involvement of free radicals in the aging process.
Examples: The two most familiar antioxidants used are butylated hydroxy toluene (BHT) and butylated hydroxy anisole (BHA) (Figure 1). These phenolic compounds are added to preserve fats in packaged food. Oxygen reacts preferentially with BHA or BHT rather than oxidizing fats or oils, thereby protecting them from spoilage. The addition of BHA to butter increases its storage life from months to years. Sometimes, BHT and BHA are added in combination with citric or ascorbic acids to produce a more active synergetic
effect.

Sulphur dioxide and sulphites ( such as sodium sulphite, sodium bisulphite and sodium metabisulphite) are useful antioxidants for wine and beers, sugars syrups and cut, peeled or dried fruits and vegetables. They prevent or reduce their discoloration.

Questions from the section

1. Name one antioxidant commonly used to increase the storage life of butter.
2. Name one antioxidant used in wine and beers.

Be the first to comment - What do you think?  Posted by admin - March 7, 2012 at 6:14 pm

Categories: AISSCE CHEMISTRY, CBSE Chemistry, CHEMISTRY IN EVERYDAY LIFE, SUPPLEMENTAY PORTIONS   Tags: , , , , ,

CBSE AISSCE Chemistry marks distribution 2012

cbse_chemistry_mark_distribution_2012

Find below the marks distribution for various units of AISSCE Chemistry 2012 (Class 12).

A knowledge of the distribution of marks helps the students prepare for the exam in a good manner.

1 comment - What do you think?  Posted by admin - March 6, 2012 at 6:02 pm

Categories: AISSCE CHEMISTRY, CBSE Chemistry, curriculum, syllabus   Tags: , , , ,

Next Page »