Which of the following statements about anhydrousaluminium chloride is correct?
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Solution
AlCl3 exists as a dimer (Al2Cl6). It is a strong Lewis acid as it has an incomplete octet and has a tendency togain electrons. AlCl3 undergoes hydrolysis easily and forms an acidic solution. AlCl3 + 3H2O→Al(OH)3+ 3HCl
Option(c) is true that AlCl23 sublimes at 180ºC.
Copper can be extracted from
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Solution
Malachite is CuCO3. Cu(OH)2 it is ore of copper.
The electronic configuration of gadolinium (Atomic number 64) is
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Solution
We know that atomic number of gadolinium is 64. Therefore the electronic configuration of gadolinium is [Xe] 4f7 5d1 6s2. Because the half filled and fully filled orbitals are more stable.
Which one of the following is a colligative property ?
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Solution
Osmotic pressure is a colligative property.
The compound C is –
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Solution
The correct sequence which shows decreasing order of the ionic radii of the elements is
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Solution
All the given species contains 10 e–each i.e.isoelectronic.
For isoelectronic species anion having high negative charge is largest in size and the cation having high positive charge is smallest.
NH3 gas can be dried by?
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Solution
NH3 gas can be dried by CaO (calcium oxide orquicklime).
Resonance structures can be written for
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Solution
Resonating structures can be written only for such molecules in which multiple bonds are present, eg, O3
The product formed by heating iodoform with KOH is :
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Solution
The highest boiling point is expected for :
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Solution
For isomeric alkanes,the one having longest straight chain has highest b.p. because of larger surface area.
The weight of NaCl decomposed by 4.9g of H2SO4, if 6 g of sodium hydrogen sulphate and 1.825 g of HCl, were produced in the reaction is:
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Solution
According to law of conservation of mass "mass is neither created nor destroyed during a chemical change"
∴ Mass of the reactants = Mass of products
x + 4.9 = 6+ 1.825
or x = 2.925 g
A new C — C bond is formed in :
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Solution
During the process of electrolytic refining of copper, some metals present as impurity settle as ‘anode mud’. These are
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Solution
During the process of electrolytic refining of copper Ag and Au are obtained as anode mud.
The best method to prepare cyclohexene from cyclohexanol is by using
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Solution
Conc. HCl, HBr and conc. HCl + ZnCl2 all are nucleophiles,thus convert alcohols to alkyl halides. However, conc. H3PO4 is a good dehydrating agent which converts an alcohol to an alkene.
A compound (X) on ozonolysis followed by reduction gives an aldehyde, C2H4O and 2-butanone, compound (X) is
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Solution
Which one of the following is reduced with zinc and hydrochloric acid to give the corresponding hydrocarbon?
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Solution
The average kinetic energy of 28 g CO at,300 K is E kcal. The average kinetic energy of 2 g H2 at the same temperature would be…..k cal.
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Solution
28g of CO = 28⁄28 = 1 mole; 2g H2 = 2⁄2 = 1 mole
Since the temperature and moles are the same,the average kinetic energy will also be the same.
For the reaction : 2NO2(g) ⇌ 2NO(g) + O(g),(Kc= 1.8× 10–6 at 184ºC and R = 0.0831 kJ/ mol. K)When Kp and Kc are compared at 184°C, it is found that
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Solution
How many isomeric naphthylamines are expected in the following reaction ?
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Solution
Aqueous solution of Na2S2O3 on reaction with Cl2 gives –
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Solution
The following reaction occurs
Na2S2O3 + 4Cl2 + 5H2O → 2 NaHSO4 + 8HCl.