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پستهای کانال
Class- 11th ICB,
Branch- Dombivli
Subject- Chemistry
Chapter- Mole concept
Que- Two. Mole of NH loses 20 mole of electrons to form compound. Why? Assuming that all nitrogen appears in the new compound if there is no change in ON of hydrogen, the ON of nitrogen in Y is
| 2 |  Subject - physics
Chapter - Relative Motion
Question
A coin is released inside a lift at a height of 2 m from the floor of the lift. The height of the li 10 m. The lift is moving with an acceleration of 11 m/s² downwards. The time after which the coin will strike the lift is | 355 |
| 3 | Subject- chemistry
Question- The election gain enthalpy of hellium is poste
while carbon and oxygen have substantial negative
electron gain enthalples. Why? | 510 |
| 4 | Subject- Chemistry
Question- a A complex compound which is formed by nitrate and bromide ligands, gives 2 mol precipitate of AgBr,
When reacts with AgNOs, the formula of complex is | 457 |
| 5 | Subject- Chemistry
Question- In Resonance hybrid of ozone molecules 0 - 0 bond length is | 361 |
| 6 | Subject:physics
Problem:solution for above question
Batch-12th science
Topic:superposition of waves | 447 |
| 7 | Subject- chemistry
Que - The number of species having a square planar shape from the following is | 414 |
| 8 | Physics
Question -
What is the dimension of s = ut+ ½at² | 490 |
| 9 | Batch : 12 sci
Subject : physics
Topic : current electricity
Doubt : Resistances P = 10 Ω, Q = 15 Ω, S = 50 Ω and R = 25 Ω are connected in order in the arms AB, BC, CD and DA respectively of a Wheatstone network ABCD. A cell is connected between A and C. What resistance has to be connected in parallel to S to balance | 400 |
| 10 | Subject- Chemistry
Topic-48. Of cobalt and zinc salts, which are attracted in magnetic field?
Solution- Cobalt has unpaired electrons in it's 3d orbitals which zinc has all paired electrons in 3d orbitals hence cobalt salts are going to be attracted to the magnetic field. | 339 |
| 11 | Subject- chemistry | 320 |
| 12 | Subject- chemistry | 323 |
| 13 | Subject- chemistry | 318 |
| 14 | Subject- chemistry | 315 |
| 15 | Subject- chemistry | 323 |
| 16 | Subject- chemistry | 330 |
| 17 | Sub - chemistry
Topic: Chemical Bonding
Doubt:
In CO₂, SO₂, SiO₂ each central atom is covalently bonded with :-
(1) 2,2,4 oxygen atoms respectively
(2) 2,2,2 oxygen atoms respectively
(3) 2, 4, 4 oxygen atoms respectively
(4) 4,4,4 oxygen atoms respectively
Answer - Option 1) 2,2,4 oxygen atoms respectively.
SiO2 has a 3D structure where one si atom is attached to 4 oxygen atoms | 246 |
| 18 | Sub - Chemistry
Topic: Modern Perioduc Table
Doubt
Incorrect order of radius is :-
(1) Sr^ +2 <Rb^ +1 < Br^-1 < Se ^ - 2
(2) Nb ^ 5 < Zr ^ 4 < Y^ 3
(3) Co > Co ^ 2 > Co ^ 3 > Co ^ 4
(4) Ba^ +2 <Cs^ +1 < Se ^ - 2 < As ^ - 3 | 248 |
| 19 | SUBJECT: (Maths 1)
TOPIC OR CHAPTER: Trigonometry 2
Question: prove that :-
1. Sec840° Cot(-945°) + Sin600° Tan(-690°) = 3/2 | 422 |
| 20 | Subject : physics
Doubt : Tightly wound long solenoid is kept with its axis parallel to a large metal sheet carrying a surface current. The surface current through a width of the sheet is and the number of terms per unit. Length of the solenoid is the magnetic field near the centre of the solenoid is found to be zero. A)Find the current in the solenoid
B)if the solenoid is rotated to make its axis perpendicular to the metal sheets, what would be the magnitude of the magnetic field near its centre | 329 |
