Recently you heard a lot about `H_(1)N_(1)` virus from medias. PCR technique is used for proper diagnosis of the disease by our research institutes. What is the significance of PCR technique in the early diagnosis of `H_(1)N_(1)`.

What is the concentration of 1.5N solution of H_(2)O_(2) in terms of volume ?

Examine the samples given. a) 20g He b) 44.8 L of NH_3 at STP c) 67.2 L N_2 at STP d) 1 mole of H_2 SO_4 e) 180g of water i) Arrange the samples in the increasing order of the number of molecules in each. ii) What will be the ascending order of the number of atoms? iii) What will be the mass of samples b,c, and d?

For one-electron species, the wave number of radiation emitted during the transition of electron from a higher energy state (n_(2)) to a lower energy state (n_(1)) is given by: bar v =(1)/(lamda)=R_(H) xx Z^() ((1)/(n_(1)^(2)) (1)/(n_(2)^(2))) where R_(H)=(2 pi m_(s) k^(2) c^(4))/(h^(3) c) is Rydberg constant for hydrogen atom. Now, considering nuclear motion, the accurate measurement would be obtained by replacing mass of electron (m_(e)) by the reduced mass (mu) in the above expression, defined as mu =(m_(n)xx m_(e))/(m_(n) +m_(e)) where m_(n) = mass of nucleus. For Lyman series, n_(t) =1 (fixed for all the lines) while n_(2) = 2, 3, 4 .... For Balmer series: n_(1) = 2 (fixed for all the lines) while n_(2) = 3,4,5 .... If proton in hydrogen nucleus is replaced by a positron having the same mass as that of an electron but same charge as that of proton, then considering the nuclear motion, the wavenumber of the lowest energy transition of He+ ion in Lyman series will be equal to

Construct a reaction between carboxy haemoglobin with oxygen from the following equations. Haemoglobin +O_2 (aq) rarr Oxyhaemoglobin, Delta H_(l)=-23.1 kJ / mol rarr(1) Haemoglobin +CO (aq) rarr Carboxyhaemoglobin, Delta H_(2)=,-32.4 kJ / mol rarr(2) a. Using the value of Delta from your equation, account for the extreme toxicity of carbon monoxide. b. What are the sources of carbon monoxide in the atmosphere. How can you rectify the adverse éffects of C O in atmosphere?

How much energy is réquired to ionise a 'H' atom if the electron occupies 'n=5' orbit? Compare your answer with the ionisation enthalpy of 'H' atom (energy required to remove the electron from 'n=1' orbit).

When light rays enter from one medium to another, refraction takes place. Consider refraction of light at a spherical surface separating two media of refractive indices n and n_2 (n_2 > n_1) .In the above case let the first medium be air and the second medium glass of refractive index 1.5, R of spherical surface = 20cm. An object is placed in air 100cm from the glass surface. At what position the image is formed?