Name any 10 metals and any 10 nonmetals.
The name of 10 metals and 10 non-metals are given below in the table: 10 Metals 10 Non-metals Lithium (Li)... View Article
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In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are 12 24Mg(23.98504u), 12 25 Mg (24.98584u) and 12 26 Mg (25.98259u). The natural abundance of 12 24 Mg is 78.99% by mass. Calculate the abundances of other two isotopes.
Let the abundance of 12Mg24 is x% Now, abundance of 12Mg26 by mass = (100−78.99−x)% = (21.01−x)% Therefore, as... View Article
Ionic solids conduct electricity in molten state but not in solids state. Why?
Yes. Ionic solids conduct electricity in a molten state but not in solids state. This is because, in ionic compounds,... View Article
Explain two ways by which food industries prevent rancidity
The oxidation of oils or fats in a food resulting in a bad smell and bad taste is called rancidity.... View Article
C6H5ONa + C2H5Cl ——> ??
C6H5ONa + C2H5Cl ——> C6H5 – O – C2H5 + NaCl
Explain the pauling scale for the determination of electronegativity
Pauling scale is based on an emperical relation between the energy of a bond and the electronegativities of bonded atoms.... View Article
The ratio of hydrogen and oxygen by mass in water is: (a) 1: 8 (b) 8: 1 (c) 2: 1 (d) 1: 2
The ratio of hydrogen and oxygen by mass in water is 1: 8. Therefore, the correct answer is option (a)
Is water an element or a compound? Give reason in support of your answer
Water is a compound because of the reasons given below 1. Water is made up of two different elements Hydrogen... View Article
IUPAC name of K3[Fe(C2O4)3] is: (a) Potassium dioxalatoferrate (I) (b) Potassium dioxalatoferrate (III) (c) Potassium trioxalatoferrate (III) (d) Potassium trioxalatoferrate (II)
The IUPAC name of K3[Fe(C2O4)3] is Potassium trioxalatoferrate (III). Hence, the correct answer is option (c)
What is milk of lime?
The suspension of slaked lime in water called milk of lime.
Equivalent weight of aluminium in Al2O3 is:
Equivalent weight = Molecular weight/Valency In Al2O3, valency of Aluminium is 3. Therefore, Equivalent weight of Al in Al2O3 =... View Article
The substance which give heat n light after combustion are called?
The substance which gives heat n light after combustion is called a Combustible substance. Examples are wood, coal, kerosene, petrol,... View Article
Calculate the molecular mass of: (a) Sodium Sulphate (b) Calcium Phosphate
Molecular mass of Sodium Sulphate, Na2SO4 = 23(2)+32+16(4) = 142 g/mol Molecular mass of calcium phosphate, Ca3(PO4)2 = 40×3+2×(31+16×4)= 310... View Article
What is the mixture of CaC2 and N2 called? How it is prepared?
The mixture of CaC2 and N2 is called Nitrolim or Calcium Cyanamide. CaCN2 : The compound Nitrolim is formed when the nitrogen passes... View Article
How many groups and periods are present in the modern periodic table?
There are eighteen groups and seven periods present in the modern periodic table.
Which one of the following has an optical isomer? (a) [Zn(en)(NH3)2]2+ (b) [Co(en)3]3+ (c) [Co(H2O)4(en)]3+ (d) [Zn(en)2]2+ {en = ethylenediamine}
Answer: (b) [Co(en)3]3+
Find the oxidation number of N in NH4 ion.
For NH4+, the oxidation number of hydrogen is +1. Hence, N + (4 x H) = +1 N + (4... View Article
On heating ammonium dichromate and barium azide separately we get: (A) N2 in both cases (B) N2 with ammonium dichromate and NO with barium azide (C) N2O with ammonium dichromate and N2 with barium azide (D) N2O with ammonium dichromate and NO2 with barium azide
(A) N2 in both cases On heating ammonium dichromate and barium azide, it produces N2 gas separately. (NH4)2Cr2O7 —–> N2+4H2O+Cr2O3... View Article
Identify the reaction which is just opposite to sublimation. (A) Deposition (B) Freezing (C) Vaporization (D) Condensation (E) Melting
(A) Deposition The term sublimation is the passage or the transformation or conversion that substances undergo when passing from one... View Article
A polished silvery surface is a: (A) Good absorber and good reflector of heat (B) Good absorber and bad reflector of heat (C) Poor absorber and good reflector of heat (D) Poor absorber and bad reflector of hear
Answer: (C) Poor absorber and good reflector of heat A polished surface reflects all the heat that falls on it,... View Article
