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Which acid is present in grapes?

The principal organic acids found in grapes are tartaric, malic, and to a small extent, citric. Grapes are one of... View Article

Why is cotton is solid but it floats on water?

Cotton is a solid which has minute (porous) holes. The pores tend to trap the air and thus the density... View Article

what do you mean by interconversion of states of matter?

Answer: Interconversion of matter refers to the change of one state to another. It is a process by which matter... View Article

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... 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... 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,... 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)

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 =... 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)

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... 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 number of... 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... 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... 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... 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... 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... View Article

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