Calculate the number of moles of electron weighing1 Kg.
Answer: A mole is defined as the amount of a substance that contains exactly 6.02214076 x 1023 ‘elementary entities’ of... View Article
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Specify the oxidation state of Chlorine in CaOCl2.
We have to determine the oxidation state of chlorine in the compound CaOCl2. Let us first know the definition of... View Article
Which of the following does not show iIodoform test? (a) Ethyl methyl ketone (b) Isopropyl alcohol (c) 3 -Methyl – 2– butanone (d) Isobutyl alcohol
The correct answer is (d) Isobutyl alcohol The iodoform test is a qualitative chemical test for the identification of ketones and... View Article
On what basis is the discharge potential of ion determined?
Discharge potential is dependent on the reduction potential of an atom. It is the tendency of an ion to gain... View Article
Depict the shape of C2H2(ethene) on the basis of hybridisation.
Ethylene is an unsaturated organic compound with the chemical formula C2H4. It has one double bond and is the simplest... View Article
Which of the follwing compounds have largest number of molecules? (a) 36 g of water (b) 28 g of CO (c) 46 g of ethy1 alcohol (d) 54 g of nitrogen pentaoxide (N2O5)
A mole is defined as the mass of the substance which consists of an equal quantity of basic units. A... View Article
Find out the molarity of water if its density is 1000 kg/m3
Molarity of a given solution is defined as the total number of moles of solute per litre of solution. The... View Article
Give the basicity of H3PO4.
Basicity means number of replaceable hydrogen atoms. H3PO4 3H+ + PO4- For hydrogen to be acidic it must be attached... View Article
Define lanthanoid contraction and mention its consequences.
Lanthanides are the rare earth elements of the modern periodic table i.e. the elements with atomic numbers from 58 to... View Article
How 0.50 mol Na2CO3 is different from 0.50 M Na2CO3?
0.50 mol Na2CO3 refers to the number of moles but 0.50 M Na2CO3 refers to the molarity of the solution. Let us... View Article
Specify the co-ordination number of Calcium and Fluoride ion in the compound Calcium fluoride (CaF2)
In CaF2 the coordination number of Ca2+ is 8. As it is surrounded by 8 F ions. In CaF2 the... View Article
Mention a simple way to find hybridisation.
Hybridization is defined as the concept of mixing two atomic orbitals to give rise to a new type of hybridized... View Article
1 mole atom of diatomic gas at NTP will be 11.2 litres
In the field of chemistry, a mole is defined as the amount of a substance that contains exactly 6.02214076 *... View Article
Calculate the equivalent mass of HCl in the given reaction : K2Kr2O7+14HCl—>2KCl + 2CRCl3 + 3Cl2 + H2O
Answer: An equivalent weight of a solution is defined as the molecular weight of the solute divided by the valence... View Article
What is the weight of the residue obtained when 2.76 g of silver carbonate is strongly heated? a. 2.16 g b. 2.48 g c. 2.32 g d. 2.64 g
On heating Silver carbonate Ag2CO3, we get Ag2CO3——-> 2Ag + CO2 + 1/2 O2 Metal carbonates usually decompose into metal... View Article
Define racemisation and resolution.
The process in which the pure enantiomers are converted into a racemic mixture is called racemisation. The process of separation... View Article
Predict the oxidation number of nitrogen in ammonia ( NH3)
The oxidation number of an atom is defined as the charge that an atom appears to have on forming ionic... View Article
Explain the hybridisation of ClF3.
Chlorine trifluoride is an interhalogen compound with the chemical formula ClF3. Chlorine Trifluoride (ClF3) represents a Trigonal bipyramidal geometry. In this... View Article
Highlight the similarities between Lithium and Magnesium
Answer: Similarities between Lithium and Magnesium are Both are quite hard. The hydroxides of both the elements are weak bases... View Article
What does Bohr’s model depict? (a) The spectrum of hydrogen atom only(b) Spectrum of atom or ion containing one electron only(c) The spectrum of hydrogen molecule(d) The solar spectrum
Bohr’s model depicts the spectrum of atom or ion having one electron. He could not explain the species of any... View Article
