| Message |
|
|
|
Used to detect the presence of the carbonyl group. (C double bond O group)Tollens test detects presence of aldehydes only.
|
|
|
|
|
A "nucleophile" is a species that attacks electron deficient sites in a reaction.Nucleophiles are generally negatively charged and they mostly attack positively charged species, but this is not always necessary.Comes from nucleo (indicating nucleus) and phile (meaning "loving/liking")
|
|
|
|
|
I will be scoring around these marks in the following entrances:IIT 142AIEEE 237ComedK124VITEEE RANK:4508BITS: 291Where would be the best colleges to pursue comp sc, EEE & ECE respectively?Thanks for the help!
|
|
|
|
|
why is it sin30??360-300 = 60therefore sin 60!
|
|
|
|
|
I'm getting 1.73 with the formula. That's why!!
|
|
|
|
|
|
47: The hydrolysis of ester in the presence of alkali solution follows ??..order1. 12. 23. 04. 3
|
|
|
|
|
35: Two solutions A and B separeated by a semipermeable membrane solution A has agreater vapour pressure than solution B Water will be flowing1. From A to B2. From B to A3. Equal amount of water flows from A and B4. None of these
|
|
|
|
|
34: When a piece of copper wire is immersed in a solution of silver nitrate,the colour of thesolution becomes blue.This is due to the1. Oxidation of Cu2. Reduction of Cu3. Formation of a complex4. Oxidation of Ag
|
|
|
|
|
15: For a covalent solid, the units which occupy lattice points are1. Atoms2. Ions3. Molecules or atoms4. Electrons
|
|
|
|
|
|
38. One kg of water is evaporated from 6kg of sea water containing 4% salt. The percentage ofalt in the remaining solution will be(a) 1%(b) 3.33%(c) 4%(d) 4.8%
|
|
|
|
|
35. After one ? emission two ? emissions(a) mass number reduces by 2(b) atomic number remains unchanged(c) mass number reduces by 6(d) (b) & (c) are correct
|
|
|
|
|
32. 24 cells each of internal resistance 0.5? are to be used to send a maximum current throughan external resistance of 3?. The cell should be arranged as(a) all in parallel(b) all in series(c) 2 rows of 12 cells each(d) rows of 6 cells each
|
|
|
|
|
23. An ideal heat engine exhausting heat at 270C is to have 25% efficiency. It must take heat at(a) 1270C(b) 2270C(c) 3270C(d) 6730C
|
|
|
|
|
18. The diameters of two planets are in the ratio of 4:1 and their mean densities in the ratio of 1:2.The acceleration due to gravity on the surface of two planets will be in the ratio(a) 4:1(b) 1:8(c) 1:2(d) 2:119.
|
|
|
|
|
2. Time of flight of a projectile projected up with a velocity of 10m/s at an angle 300 with thehorizontal is (g=10 m/s2)(a) 1/2 s(b) 1 s(c) 2 s(d) 3s
|
|
|
|
|
07. The number of significant digits in 0.00002 and 20,000 respectively are(a) 1 and 5(b) 1 and 1(c) 5 and 1
|
|
|
|
|
110. The number of moles of solute present in 1000 ml of the water and aqueous solution arerespectively called(a) Morarity & Morality(b) Morality & Molarity(c) Normality & Molarity(d) Normality & Molality
|
|
|
|
|
100. To a mixture of acetic acid and sodium acetate a further amount of sodium acetate is added. ThepH of the mixture:(a) increases(b) decreases(c) remains unchanged(d) not predictable
|
|
|
|
E-Store
