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These solutions for Acids, Bases And Salts are extremely popular among Class 9 students for Science Acids, Bases And Salts Solutions come handy for quickly completing your homework and preparing for exams. Identify the odd one out and justify. Hydrogen chloride is odd because Hydrogen chloride is acid and rest are base. Sodium carbonate is odd because the solutions of sodium nitrate, sodium sulphate and sodium chloride are neutral. Common salt is odd because on heating, there is no change in color of compound.SEE VIDEO BY TOPIC: L25: Odd Man Out Number Series - Quantitative Aptitude (Banking) - Lokesh Sharma
Synthetic applications of beta-fluoroalkylated alpha,beta-unsaturated carbonyl compounds.
These solutions for Acids, Bases And Salts are extremely popular among Class 9 students for Science Acids, Bases And Salts Solutions come handy for quickly completing your homework and preparing for exams.
Identify the odd one out and justify. Hydrogen chloride is odd because Hydrogen chloride is acid and rest are base. Sodium carbonate is odd because the solutions of sodium nitrate, sodium sulphate and sodium chloride are neutral.
Common salt is odd because on heating, there is no change in color of compound. But in rest of the compounds, there is change is colour. Potassium hydroxide is odd because in a reaction, when Sodium chloride reacts with acetic acid, then Sodium acetate is formed. There is no role of Potassium hydroxide in the reaction given below.
Write down the changes that will be seen in each instance and explain the reason behind it. Then 2ml concentrated NaOH was added to it and stirred. On cooling, water was added to it.
Phenolphthalein is an indicator used for determining the quantity of base. When two drops of Phenolphthalein indicator are added to 10 mL solution of Sodium hydroxide, then the solution turns pink in colour because the acidic part of phenophthalein reacts with the base, it forms sodium salt of phenolphthalein which has pink color.
For example : In acid base titration phenolphthalein is used to detect end point of base. There are actually two equations for the reaction of copper with nitric acid take place. It depends on whether the nitric acid is concentrated or not. If it is dilute then the ratio is When litmus paper is dipped into 2 mL of dilute HCl solution , then blue litmus paper is turned into red colour and there is no effect on red litmus paper.
Again, if the same litmus paper is dipped into 2 mL of concentrated NaOH solution, then red litmus paper turns into blue colour but there is no effect on blue litmus paper. This is due to the respective properties of blue and red litmus paper with acid and base. Magnesium oxide is a base.
This reaction is known as neutralisation reaction. MgO doesnot react with NaOH. As NaOH is a base and bases react only with oxides of non-metal to form salt and water because oxides of non-metals are said to be acidic in nature so neutralization reaction take place. But MgO is a oxide of metal so, reaction is not possible. Zinc oxide is added to dilute HCl, then neutralization reaction takes place to form salt and water.
The reaction is as follows:. Limestone is calcium carbonate. When pieces of blue vitriol are heated in a test tube, then crystal structure of blue vitriol broke down to forn a colourless powder and water come out. This water is called water of crystallization. This is due to reversible reaction take place from anhydrous salt to hydrous salt and vice-versa.
When a dilute solution of sulfuric acid is electrolysed, gases are produced at both the anode and the cathode electrode. The gas produced at the cathode burns with a 'pop' sound, when a sample is lit with a lighted splint.
This shows that the gas is hydrogen. The gas produced at the anode relights a glowing splint dipped into a sample of the gas. This shows that the gas is oxygen. Classify the following oxides into three types and name the types.
Explain by drawing a figure of the electronic configuration. Formation of sodium chloride from sodium and chlorine. Formation of a magnesium chloride from magnesium and chlorine. Atomic number of Sodium Na atom is In order to achieve the nearest noble gas configuration, it loses one electron to form Sodium ion.
In order to achieve the nearest noble gas configuration, it gains one electron to form Chloride ion. Atomic number of Magnesium 12 atom is In order to achieve the nearest noble gas configuration, it loses two electrons to form Magnesium ion. Show the dissociation of the following compounds on dissolving in water, with the help of chemical equation and write whether the proportion of dissociation is small or large.
Obtain a sample of rainwater. Add to it a few drops of universal indicator. Measure its pH. Describe the nature of the sample of rainwater and explain the effect if it has on the living world. This is an activity based question in which you are supposed to collect rainwater from different places and compare there results on the basis of following parameters : a pH of water b Action of water on blue litmus paper c Action of water on red litmus paper d Effect of indicator like phenolphthalein and methyl orange Conclusion : If we take samples of rain water from different places, we observe the following results : pH of water is in between Blue litmus paper turns red No change in colour of red litmus paper No change in colour of rain water on adding phenolphthalein rain water turns red in colour on adding methyl orange The above observations show that rainwater is acidic in nature.
For further assurance, we cancompare blue litmus paper dipped in different samples of rainwater with pH scale. If rain water is acidic, then its pH must be in the range of The strength of ac acid depends on its pH value i. Answer the following questions. What is meant by neutralization? Give two examples from everyday life of the neutralization reaction.
Explain what is meant by electrolysis of water. Write the electrode reactions and explain them. Ans 8. Based on Basicity acids were classified into different types : 1. Mono-basic acids 2. Di-basic acids 3. Tri-basic acids 1. Mono-basic acids :. Acids, which on ionisation produce one hydronium ion on reaction with water. Acids, which on ionisation produce one hydrogen ion. Di-basic acids : Acids, which on ionisation produce two hydronium ion on reaction with water Acids, which on ionisation produce two hydrogen ion For example : H 2 SO 4, H 2 CO 3 etc.
Tri-basic acids : Acids, which on ionisation produce three hydronium ion on reaction with water Acids, which on ionisation produce three hydrogen ion For example : H 3 PO 4 , H 3 PO 3 etc. Neutralization reaction :. The neutralization of a strong acid and strong base has a pH equal to 7. The neutralization of a strong acid and weak base will have a pH of less than 7.
The neutralization of a strong base neutralizes a weak acid will be greater than 7. Neutralization reaction has application in daily life: 1 Self defence by animals and plants through chemical warfare : Bee stings are acidic in nature, household remedy for a bee sting is baking soda or sodium bicarbonate, which is a basic substance.
A wasp stings are mildly basic, household remedy for this will be vinegar, also known as acetic acid. These simple treatments ease these painful stings by a process called neutralization. Thus acid is formed in the mouth after digestion. This will lead to the cause of tooth decay. The best way to prevent tooth decay is to clean the mouth after eation food with toothpaste, which is basic in nature. This will result in neutralization of acid by base.
If the soil is too acidic or too basic alkaline , the plants grow badly. The acidic soil is neautralize by treatment with materials like quicklime calcium oxide or slaked lime calcium hydroxide or chalk calcium carbonate.
If the soil is too basic, then alkalinity can be reduced by adding decaying organic matter manure or composite which contains acidic materials. Electrolysis of water : Electrolysis of water is the decompositon into oxygen and hydrogen gas due to an electric current passed through the water.
The following equation represents the electrolysis of water : H 2 O l. On positively charged anode, an oxidation reaction occurs, generating oxygen gas by giving electrons to the anode :. The same half reactions can also be balanced with base as listed below. To add half reactions they must be balanced with either acid or base. Combining either half reaction pair yields the same overall decomposition of water into oxygen and hydrogen:.
The number of hydrogen molecules produced is thus twice the number of oxygen molecules. The produced hydrogen gas has therefore twice the volume of the produced oxygen gas. The number of electrons pushed through the water is twice the number of generated hydrogen molecules and four times the number of generated oxygen molecules.
Give reason for the following. Buttermilk spoils if kept in a copper or brass container. When it is dissolved in water, HCl is ionized completely in aqueous solution. Lactic acid reacts with the container material and produces poisonous complex. It is actually the reaction between acid and metal. This reaction is called as electro chemical reaction.
Write the chemical equations for the following activities.
Odd Man Out
Patriots Calabria during a Military Residence. Kaintuck a Genuine Colling Mary Fables and other pieces. OConnell on the
Odd Name Out
Maharashtra Board Class 8 for General Science. Chapter 1 Solution Link. Explain your statement. Public toilet is present near his house. His father is drunkar d His mother does not know the importance of balanced diet. Atmospheric, Sea bottom, Space. Find the relative density of the metal. Density of water is 1 gcm Will the object float on water or sink in water?
Test of Reasoning
In a group of characters with Theme Naming , sometimes one just doesn't fit the pattern. For some reason, this character tends to be named Bob, due to the inherent hilarity of the name "Bob". He may also be a Special Person, Normal Name. Sometimes identifies The Runt at the End.
These solutions for Composition Of Matter are extremely popular among Class 8 students for Science Composition Of Matter Solutions come handy for quickly completing your homework and preparing for exams. Choose the appropriate option and rewrite the following statements. Solids retain their voume even when external pressure is applied. Water, mercury and bromine are similar o each other, because three are i.
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