Chemistry
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New answer posted
a year agoContributor-Level 10
(a) Silicon is heated with methyl chloride at high temperature in the presence of copper catalyst at 537 K, methyl substituted chlorosilanes MeSiCl3, Me2→SiCl2→, Me3→SiCl and Me4→Si are formed.
(b) When silicon dioxide is treated with hydrogen fluoride, first SiF4→ is formed and then hydro fluorosilicic acid is obtained.
SiO2 →+ 4HF → SiF4 →+ 2H2→O
SiF4+2HF → H2SiF6
(c) When CO is heated with ZnO, ZnO is reduced to Zn metal.
CO + ZnO →CO2 →+ Zn
(d) When hydrated alumina is treated with aqueous NaOH solution, it dissolves to form sodium meta aluminate.
Al2→O3→.2H2→O+2NaOH→
New answer posted
a year agoContributor-Level 10
1.9. Average atomic mass = (Fractional abundance of 35Cl x molar mass of 35Cl) + (Fractional abundance of 37Cl x molar mass of 37Cl)
= (75.77/100 x 34.9689) + (24.23/100 x 36.9659)
= 26.4959 + 8.9568
= 35.4527
New answer posted
a year agoContributor-Level 10
(a) When borax is heated strongly, it loses water and swells into the white mass, which on further heating melts to form a transparent glassy solid called borax glass and borax bead.
Na2B4O710H2O→ Na2B4O7+ 10H2O
Na2B4O7 → 2NaBO2+ B2O3
(b) When boric acid is added to water, it accepts electrons from –OH ion. Boric acid is sparingly soluble in cold water however fairly soluble in hot water.
B (OH)3→ + 2H2→ O→ [B (OH)4→ ]→ + H3→ O+
(c) Al reacts with dilute NaOH to form sodium tetrahydroxoaluminate (III). Hydrogen gas is liberated in the process.
2Al + 2NaOH + 6H2O→ 2Na+ [Al (O
New answer posted
a year agoContributor-Level 10
Boric acid contains planar BO33- ions which are linked together through hydrogen bonding shown in the fig.
New answer posted
a year agoContributor-Level 10
Excess of CO2 absorbs heat radiated by the earth. Some of it is dissipated into the atmosphere while the remaining part is radiated back to the earth. As a result, temperature of the earth increases. This is the cause of global warming.
New answer posted
a year agoContributor-Level 10
1.7. 1 mole of CuSO4 contains 1 mole (1 g atom) of Cu
Molar mass of CuSO4= 63.5 + 32 + (4 x 16) = 159.5 g mol-1
Thus, Cu that can be obtained from 159.5 g of CuSO4 = 63.5 g
∴ Cu that can be obtained from 100 g of CuSO4 =63.5/159.5 * 100 = 39.81g
New answer posted
a year agoContributor-Level 10
The highly poisonous nature of CO arises because of its ability to form a complex with haemoglobin, which is about 300 times more stable than the oxygen-haemoglobin complex. This prevents haemoglobin in the red blood corpuscles from carrying oxygen round the body and ultimately resulting in death.
New answer posted
a year agoContributor-Level 10
Since, anhydrous HF is a covalent compound and weak acid due to high bond dissociation energy. AlF3does not dissolve in HF.
Whereas NaF is ionic compound.
3NaF + AlF3 → Na3 [AlF6]
Na3 [AlF6] + 3BF3 (g)→ AlF3 + 3Na+ [BF]–
New answer posted
a year agoContributor-Level 10
B-Cl bond has dipole moment because of polarity. In BCl3, since the molecule is symmetrical (planar), the polarities cancel out and hence the dipole moment is zero
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