Archives

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. Let us consider A-B... 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)... View Article

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 and Oxygen which cannot be... 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)... View Article

What is milk of lime?

The suspension of slaked lime in water called milk of lime. ... View Article

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 = 27/3 = 9... 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, LPG, etc.... 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 =... 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 through... 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.... View Article

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+... View Article

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 x 1) = +1 N + 4 = 1 N = 1 - 4 N = -3 Therefore, the... 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 state to... 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, like a mirror. ... View Article

The acid soluble pool represents roughly the cytoplasmic composition which of the following nutrient is most likely absent in it? (A) Lecithin (B)Calcium ions (C) Adenosin (D) Glucose

Answer: (B)Calcium ions... View Article

M	T	W	T	F	S	S
	1	2	3	4	5	6
7	8	9	10	11	12	13
14	15	16	17	18	19	20
21	22	23	24	25	26	27
28	29	30