Find and write down structures of 10 interesting small molecular weight biomolecules. Find if there is any industry which manufactures the compounds by isolation. Find out who are the buyers.

The crystal AB (rock salt structure) has molecular weight 6.023Y u , where Y is an arbitrary number in u . If the minimum distance between cation and anion is Y^(1/3) nm and the observed, The density is 20 kg m^(-3) . Find a. The density in kg m^(-3) . and b. The type of defect

Think of this puzzle What do you need to find a chosen number from this square? Four of the clues below are true but do nothing to help in finding the number. Four of the clues are necessary for finding it. Here are eight clues to use: a. The number is greater than 9. b. The number is not a multiple of 10. c. The number is a multiple of 7. d. The number is odd. e. The number is not a multiple of 11. f. The number is less than 200. g. Its ones digit is larger than its tens digit. h. Its tens digit is odd. What is the number? Can you sort out the four clues that help and the four clues that do not help in finding it? First follow the clues and strike off the number which comes out from it. Like - from the first clue we come to know that the number is not from 1 to 9. (strike off numbers from 1 to 9). After completing the puzzle, see which clue is important and which is not?

An organic compound has the formula C4H10O. It reacts with metallic sodium liberating hydrogen. (i) Write down the formula of three possible isomers of the compound which are similar and react with sodium. (ii) What will be the product if any one of the isomers reacts with acetic acid ?

Arif took a loan of ₹80,000 from a bank.If the rate of interest is 10% per annum,find the difference in amounts he would be paying after 1 1/2 years if the interest is: (i) compounded annually.(ii)Compounded half yearly.

The edge length of unit cell of a metal having molecular weight 75 g mol^(-1) is 5 Å which crystallizes in cubic lattice. If the density is 2 g cc^(-1) , then find the radius of metal atom (N_(A) = 6 xx 10^(23)) . Give the answer in pm.

A survey conducted by an organisation for the cause of illness nad death among the women between the ages 15-44 (in years) worldwide, found the following figures (in %) : (iii) Try to find out, with the help of your teacher, any two factors which play a major role in the cause in (ii) above being the major cause.

The atomic numbers of two elements are 8 and 16 respectively. Write the electronic configuration of these two elements. Do you keep these two elements in the same group of the modern periodic table? Justify your answer. Find out which of these two elements is more electronegative. Give reason for your answer.

(a) Draw a labelled ray diagram of an astronomical telescope to show the image formation of a distant object. Write the main consideration required in selecting the objective and eyepiece lenses in order to have large magnifying power an dhigh resolution of the telescope. (b) A compound microscope has an objective of focal length 1.25cm and eyepiece of focal lenth 5 cm. A small object is kept at 2.5 cm from the objective. If the final image formed is at infinity, find the distance between the objective and the eyepiece.

A man went door to door posing 2s a goldsmith he promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man had a hasty retreat. Canyou play the detective to find out the nature of the solution he had used ?