Write one difference between
i. Spindle and setae
ii. Coelom and pseudoçelom
iii. Placoid and ganoid scales

Write any one difference between primary cell and secondary cell.

Write one difference between following:pairs i. Canal system and water vascular system ii. Protochordata and vertebrata iii.Cockroach and crab

Write differences between Acoelomates, pseudocoelomate and coelomate and give atleast one eg: of each.

Write one similarity and one difference between antiseptics and disinfectants.

a) For the oxidation of iron 4 Fe_((s))+3O_(2(g))rightarrow2Fe_2O_(3(s)) , entropy change is -549.4 JK^-1mol^-1 at 298 K. Inspite of the negative entropy change of this reaction, why is the reaction spontaneous? ( DeltaH_r^0 for the reaction is - 1648xx10^3Jmol^-1 ). b) Write the difference between extensive and intensive properties. Give one example of each.

The Structural formula of two organic compounds are given i) CH_(3)OCH_(2)CH_(3) ii) CH_(3)CH_(2)CH_(2)OH a) What are the IUPAC names of these comounds? b) Write one similarity and one difference between these two compounds c) what is this phenomenon knowns as?

Consider all rectangles that can be made with a 1m long rope. Take one of its side as x cm and the area enclosed as a(x) sq.cm. i) Write the relation between a(x) and xas in equation ii) Why are the numbers a(10) and a(40) equal? iii) To get the same number as a(x), for two different numbers as x, what must be the relation between the numbers?

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?