Write the reaction when zinc carbonate is heated.
Zinc carbonate on heating decomposes to zinc oxide and carbon dioxide gas. Zinc carbonate is a white powdery solid. When... View Article
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Give the advantages and disadvantages of potentiometric titration
Potentiometric titration is a technique similar to direct titration of a redox reaction. Advantages of potentiometric titration: It is an... View Article
Suggest a word, chemicals added to food to prevent the growth of microorganisms.
To prevent any microorganism from growing in food preservative chemicals are used. These preservatives prevent the microbial infection in the... View Article
In general, metallic ropes are suspended on the carriers which take inflammable material. What is the reason?
When two bodies rub together both positive and negative charges in equal amounts appears simultaneously due to transfer of electron.... View Article
Most elements are (A) Solids (B) Liquids (C) Gases (D) Mixtures
Most elements are solids, only 11 are gases and 6 are liquid. Examples of solid elements are sodium, carbon, aluminium.... View Article
What is aerial oxidation? How it can be involved in rancidity and corrosion?
Aerial oxidation is the term used for the reaction in which air or oxygen from air is used to oxidize... View Article
When trees are cut, the amount of oxygen a) decreases b) increases c) both (a) and (b) d) remains
Cutting down of trees not only decreases the amount of O2 but also increases the amount of CO2 liberated. Usually... View Article
Why halogens are coloured?
Almost all halogens are coloured because halogens absorb radiations in the visible region. Fluorine and chlorine are green, bromine is... View Article
When baking soda is mixed with lemon juice Bubbles are formed. What gas is evolved in this reaction?
The reaction between baking soda and lemon juice can be given as below. Lemon juice+ Baking soda ⟶ CO2(bubbles)+ Other... View Article
What is the molarity of 0.2N H2SO4?
Molarity = Normality/n−factor For H2SO4, n-factor is 2 Molarity = Normality/2 Molarity =0.2/2 Molarity = 0.1M
How many bridging oxygen atoms are present in P4O10?
In P4O10 the number of oxygen atoms attached to each phosphorus atom is 4. 6 bridging oxygen atoms are present... View Article
The correct order of increasing acidic strength is: (a) phenol < ethanol < chloroacetic acid < acetic acid (b) ethanol < phenol < chloroacetic acid < acetic acid (c) ethanol < phenol < acetic acid < chloroacetic acid (d) chloroacetic acid < acetic acid < phenol < ethanol
The correct order of increasing acidic strength is Ethanol < Phenol < Acetic acid < Chloroacetic acid. Phenol is more... View Article
How to convert Ethanal to Propan-2-ol?
The conversion of ethanol to propan-2-ol is done by using Grignard’s Reagent . So ethanol is treated with ethyl magnesium... View Article
A white powder is used by doctors to support fractured bones. (a) Write the name and chemical formula of the powder. (b) How is this powder prepared? (c) When this white powder is mixed with water, a hard solid mass is obtained. Write a balanced chemical equation for the change.
(a) The chemical name and formula of the white coloured powder which is used by doctors for supporting fractured bones... View Article
An atom has electronic configuration 2, 8, 7. (a) What is the atomic number of this element? (b) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.) (a) N(7) (b) F(9) (c) P(15) (d) Ar(18)
Answer: (a) The number of electrons present in an atom is ⇒ 2+8+7 = 17. Therefore, the atomic number of... View Article
Write the chemical equation of the reaction of ethanoic acid with the following: (1) sodium (2) Sodium Hydroxide (3) ethanol. Write the name of one main product of each reaction.
The chemical equation when Ethanoic acid reacts with Sodium: The main product formed is Sodium Ethanoate. 2CH3COOH + Na →... View Article
Aviation fuel for jet aeroplanes consists of purified ____?
Kerosene is used as a fuel in jet aeroplanes . Jet fuel is a colorless, combustible, straight-run petroleum distillate liquid.... View Article
What is the product formed when benzaldehyde and formaldehyde are heated with an aqueous NaOH solution?
A mixture of benzaldehyde and formaldehyde on heating with aqueous NaOH solution gives the product benzyl alcohol and sodium formate.... View Article
What are interfering radicals?
Interfering radicals are those which interfere in qualitative tests while performing salt analysis. Interfering radicals are oxalate, tartrate, fluoride, borate... View Article
The radius of Na+ is 95 pm and that of Cl− ion is 181 pm. Hence, the coordination number of Na+ will be:
The radius of the cation (r+) is 95 pm and the radius f the anion (r−) is 181 pm. radius... View Article
