Archives

Fill in the blank. Temperature of boiling water cannot be measured by a ______ thermometer.

Temperature of boiling water cannot be measured by a Clinical thermometer. An alcohol thermometer cannot be used to measure the temperature of... View Article

Which has the highest dipole moment and give the order CH₃Cl, CH₂Cl₂, CHCl₃ or CCl₄.

Answer: A bond dipole moment is a measure of the polarity of a chemical bond between two atoms in a molecule. Bond dipole moment involves the... View Article

What is a mixture of sulphur and carbon disulfide?

A mixture of sulphur and carbon disulphide is a heterogeneous colloid and shows the Tyndall effect. In a colloidal solution, the particles are... View Article

Balance the equation Na₂CO₃ + HCl → NaCl + CO₂ + H₂O

Sodium carbonate + Hydrochloric acid → Sodium chloride + Water + Carbon dioxide Na2CO3(aq)+2HCl(aq)→2NaCl(aq)+CO2(g)+H2O(l)... View Article

What is the average oxidation state of s atoms in H2S4O6?

Oxidation number of S1= +2 + 1 + 2 = Oxidation number of S3= 0 Oxidation number of S4 = +2 + 1 + 2 = +5 Average oxidation number of S = +5 + 5 +... View Article

Balance the chemical equation: Al(s) + O₂(g) → Al₂O₃(s)

The unbalanced chemical reaction is Al(s) + O2(g) → Al2O3(s) Balanced equation is given as: 4Al(s) + 3O2(g)→ 2Al2O3(s)... View Article

What is the coordination number of sodium in sodium oxide?

The coordination number of Na in Na2O is 4. Na+ ion is surrounded by four oxide ions and O2- ion is surrounded by eight Na+ ions hence the... View Article

What is the oxidation number of sulphur atom in Na₂S₂O₃?

Sodium thiosulfate (sodium thiosulphate) is an inorganic compound with the formula Na2S2O3 xH2O. Oxidation number of S1=−2 Oxidation... View Article

Are polythene and PVC examples of thermosetting plastic?

A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. Thermoplastics can be repeatedly softened by heating and... View Article

Name the metals that melt when kept on the palm. Explain the reason.

Gallium and caesium are the metals that melt when kept on palm. Gallium melts when kept on palm because they have a very low melting point and... View Article

Which of the following are exothermic processes? (i) Reaction of water with quicklime (ii) Dilution of an acid (iii) Evaporation of water (iv) Sublimation of camphor (crystals)

Answer: (i) Reaction of water with quicklime (ii) Dilution of an acid Exothermic reactions are chemical reactions that release energy as heat... View Article

Identify the substance oxidised, reduced, oxidising agent and reducing agent for each of the following reactions: (a) 2AgBr (s) + C6H6O2(aq) →2Ag(s) + 2HBr (aq) + C6H4O2(aq) (b) HCHO(l) + 2[Ag (NH3) 2] + (aq) + 3OH–(aq) →2Ag(s) + HCOO-(aq) + 4NH3(aq) + 2H2O(l) (c) HCHO (l) + 2Cu2 + (aq) + 5 OH–(aq) →Cu2O(s) + HCOO–(aq) + 3H2O(l) (d) N2H4(l) + 2H2O2(l) →N2(g) + 4H2O(l) (e) Pb(s) + PbO2(s) + 2H2SO4(aq) →2PbSO4(s) + 2H2O(l)

The substance that loses electrons is being oxidized and is the reducing agent. The substance that gains electrons is being reduced and is the... View Article

Write the balanced equation for burning of natural gas

When natural gas burns, a high-temperature blue flame is produced and complete combustion takes place. Methane is CH4 and when burnt in oxygen... View Article

Oxidation is a process that involves (A) the loss of electrons (B) the gain of hydrogen (C) the gain of electrons (D) no change in electrons

Answer: (A) the loss of electrons Oxidation is a process that involves the loss of electrons. Oxidation occurs when the oxidation state of a... 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

Archives

Fill in the blank. Temperature of boiling water cannot be measured by a ______ thermometer.

Which has the highest dipole moment and give the order CH₃Cl, CH₂Cl₂, CHCl₃ or CCl₄.

What is a mixture of sulphur and carbon disulfide?

Balance the equation Na₂CO₃ + HCl → NaCl + CO₂ + H₂O

What is the average oxidation state of s atoms in H2S4O6?

Balance the chemical equation: Al(s) + O₂(g) → Al₂O₃(s)

What is the coordination number of sodium in sodium oxide?

What is the oxidation number of sulphur atom in Na₂S₂O₃?

Are polythene and PVC examples of thermosetting plastic?

Name the metals that melt when kept on the palm. Explain the reason.

Which of the following are exothermic processes? (i) Reaction of water with quicklime (ii) Dilution of an acid (iii) Evaporation of water (iv) Sublimation of camphor (crystals)

Write the balanced equation for burning of natural gas

Oxidation is a process that involves (A) the loss of electrons (B) the gain of hydrogen (C) the gain of electrons (D) no change in electrons

Which of the following is an element? a) Water b) Oxygen c) Saltwater

Acid employed for etching of glass is (a) HCl (b) HNO₃ (c) aqua-regia (d) HF

Calculate the Molar mass of MnO₂

Write the reaction when zinc carbonate is heated.

Give the advantages and disadvantages of potentiometric titration

Suggest a word, chemicals added to food to prevent the growth of microorganisms.

FREE TEXTBOOK SOLUTIONS