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2021-09-27 06:35:39 " LAST DAYS for Snapsolve Doubt Genie GIVEAWAY Contest !!

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2021-09-26 21:22:30 Important Points of NCERT -

A mere 0.1 per cent impurities make domestic sewage unfit for human use :

Impurities 0.1%

1. Suspended solids, e.g., sand, silt and clay.
2. Colloidal material, e.g., Fecal matter, bacteria, cloth and paper fibres.
3. Dissolved materials, e.g., nutrients (nitrate, ammonia, phosphate, sodium,
calcium).

Daphnia is the indicator of BOD
Water hyacinth (Eichhornia crassipes), the world's most problematic aquatic weed, also called 'Terror of Bengal'.
Minamata disease is cause in humans in Japan by biomagnification of mercury (Hg)
The concentration of DDT is increased at successive trophic levels; say if it starts at 0.003 ppb (ppb = parts per billion) in water, it can ultimately can reach 25 ppm (ppm = part per million) in fish- eating birds, through biomagnification.

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2021-09-26 18:53:04 GOC HANDWRITTEN NOTES

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2021-09-25 18:46:38 Important Cells in NCERT

1. Heterocysts : Specialised cells found in Nostoc & Anabaena which
help in fixation of atmospheric nitrogen.
2. Smallest living cell is Mycoplasma
3. Choanocytes or collar cells - Found in sponges that line the spongocoel & canals.
4. Cnidoblasts/cnidocytes - Found in coelentrata/cnidaria which contain
the stinging capsules or nematocytes.
5. Flame cells- Found in flat worms and help in osmoregulation & excretion.
6. Statocysts- These are balancing organs found in arthropods.
7. Root hair- Found in zone of maturation and help in water & mineral absorption.
8. Guard cell- Encloses stomatal aperture or pore. Bean-shaped but in
grasses dumb-bell shaped.
9. Subsidiary cells- A few epidermal cells, in the vicinity of the guard
cells become specialised in their shape & size & called subsidiary cells
10. Bundle-sheath cells- The vascular bundles are surronded by a layer of
thick walled bundle-sheath cells.

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2021-09-25 17:50:06 Doubtnut ke Study Channels par ab sirf Instant doubt solving hi nahi
Milenge PDFs , Latest News , Previous Year Papers , Free Live Classes & aur bhi bhot kuch

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2021-09-25 17:11:40 USES OF INERT GASES :

(1) He is non-inflammable and light gas, so it is used in filling balloons for meteorological observations.
(2) He is used in gas cooled nuclear reactors.
(3) Liquid He is used as cryogenic agent.
(4) He is used to produce powerful superconducting magnets.
(5) Ne is used in discharge tubes.
(6) Ar is used as inert atmosphere in metallurgical process.
(7) Xenon and Krypton are used in light bulbs designed for special purposes.

IMPORTANT ORDER :

(1) He < Ne < Ar < Kr < Xe Atomic radius
(2) He > Ne > Ar > Kr > Xe Ionisation energy
(3) He < Ne < Ar < Kr < Xe < Rn Density
(4) He < Ne < Ar < Kr < Xe < Rn mpt. bpt Open / Comment

2021-09-25 16:43:26 ATOMIC STRUCTURE IN ONE SHOT

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2021-09-25 16:11:58 comment ur answer Open / Comment

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2021-09-25 14:50:25 Some Important Increasing Order :

1. Bond Angle :

(i) CH4 , C2H4 , C2H2
(ii) H2O, NH3 , CH4 , CO2
(iii) H2O, NH3 , CH4 , BH3
(iv) NO2—, NO2 , NO2+
(v) H2Se, H2S, H2O
(vi) AsH3 , PH3 , NH3
(vii) PF3 , PCl3 , PBr3 , PI3
(viii) NF3 , NCl3
(ix) NF3 , NH3 , NCl3
(x) OF2 , OH2 , Cl2O

2. Melting Point :

(i) Cs, Rb, K, Na, Li
(ii) Mg, Ba, Sr, Ca, Be
(iii) CaI2 , CaBr2 , CaCl2 , CaF2
(iv) BeCl2 , MgCl2 , CaCl2 , SrCl2 , BaCl2
(v) NaI, NaBr, NaCl, NaF
(vi) CsCl, RbCl, KCl, NaCl
(vii) AlCl3 , MgCl2 , NaCl

3.Boiling Point :

(i) PH3 , AsH3 , NH3 , SbH3
(ii) H2S, H2Se, H2O
(iii) HCl, HBr, HI, HF
(iv) NH3 , HF, H2O
(v) He, Ne, Ar, Kr
(vi) H2O, D2O
(vii) H2 , Cl2 , Br2

4.Dipole moments :

(i) CCl4 , CHCl3 , CH2Cl2 ,CH3Cl
(ii) NF3 , NH3 , H2O, HF
(iii) Cis-chloropropene, Trans-chloropropene
(iv) p, m, o-dichlorobenzene
(v) CH3I, CH3Br, CH3F, CH3Cl
(vi) NH3 , SO2 , H2O, HF
(vii) H2S, H2O
(viii) HI, HBr, HCl, HF
(ix) PH3 , ASH3 , SbH3 , NH3
(x) H2O, H2O2


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