List of practice Questions

Oxidation number of sulphur in Caro?? acid is
Oxidation state of Cl in $CaOCl_2$ is/are
Oxidation number of iodine in $IO_3^-$, $IO_4^-$, $KI$ and $I_2$ respectively is
Oxidation number of iodine varies from
Oxidation number of Os in $ {OsO_4}$ :
Out of the four liquids given below, the one having lowest vapour pressure at 25$^\circ$C is
Oxidation number of $Cl$ in $NOClO_4$ is
Out of benzene and phenol, phenol is more easily nitrated because
Out of $CHCl_3$, $CH_4$ and $SF_4$ the molecules having regular geometry are
Out of $ {H2S2O3, H2S2O4, H2SO5}$ and $ {H2S2O8}$ peroxy acids are
Out of 18 points in a plane, no three are in the same st. line except five points which are collinear. The number of straight lines that can be formed joining them is
Out of $7$ consonants and $4$ vowels, the number of words (not necessarily meaningful) that can be made, each consisting of $3$ consonants and $2$ vowels, is
Out of 800 boys in a school. 224 played cricket, 240 played hockey and 336 played basket ball.of the total 64 played both basket ball and hockey ; 80 played cricket and basket ball and 40 played cricket and hockey, 24 played all the three games. The number of boys who did not play in any game is
Osmotic pressure of urea solution at 10$^\circ$C is 500 mm. Osmotic pressure of the solution becomes 1053 mm when it is diluted and the temperature israised to 25 $^\circ$C. The extent of dilution is
Out of $100$ students; $15$ passed in English, $12$ passed in Mathematics, $8$ in Science, $6$ in English and Mathematics, $7$ in Mathematics and Science, $4$ in English and Science; $4$ in all the three passed. Then (i) The number of students passed in English and Mathematics but not in Science is (ii) The number of students only passed in Mathematics is (iii) The number of students passed in more than one subject is
Orthoboric acid -
Orthoboric acid when heated to red hot gives
Osmosis cannot be demostrated by a potato osmoscope using a solution of NaCl instead of sugar, because the potato tissue is
Osmosis means movement of
Organisms reproducing throughout the year are called ________ breeders e.g., ________, and those who show recurring sexual activity are called _______ breeders e.g., ________.
Organomercury compounds are
Ornithine cycle was discovered by
Ortho and para hydrogen differ
Ordinary glass is :
Ordinary water is not used as a moderator in nuclear reactors because