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what is importance pH in our daily life
The type of salt formed by partial replacement of replaceable hydrogen ion of an acid by a basic radical is ____.
explain in detail the role of pH in our daily life.
Why does an aqueous solution of an acid conduct electricity ?
What happen when nitric acid is added to egg shell??????
A student while setting up the experiment to show that CO2 is evolved during respiration committed some errors shown in the figure.
Image not present
What changes should be made in the set up to get the desired results?
(1) KOH solution should be taken in the small test tube inside the flask and germinating seeds in the beaker
(2) Water should be taken in the beaker and KOH solution in the flask
(3) KOH solution should be taken in the small test tube inside the flask and water should be taken in the beaker
(4) Water should be taken in the flask and KOH solution in the small test tube
Correct Answer: 3 Status: incorrect
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give two examples of natural indicators?
name any two synthetic indicators?
mention a few natural indicators other tha termeric ,litmus?
what is litmus what is its original colour
what is the chemical formula for soda acid fire extinguisher
what is china dish and how is it preapred
how plaster of paris is prepared?What is its chemical formula and chemical name?
Name the acid present in ant sting and give its chemical formula. Also give the common method to get relief from the discomfort caused by the ant sting.
an acid can react with
Name 20 naturally occuringacids with their source.
Which of the following chemical properties are shown by dilute hydrochloric acid ? (i) It turns blue litmus red (ii) It turns red litmus blue (iii) It reacts with zinc and a gas is evolved (iv) It reacts with solid sodium carbonate to give brisk effervescence
(a) (i) and (ii) only (b) (i) and (iii) only (c) (i), (iii) and (iv) only (d) (ii), (iii) and (iv) only
preparation of washing soda by solvay process
is mgcl2 an acidic, basic or neutral salt?
WHAT IS THE DIFFERENCE BETWEEN ALKALIS AND BASES ?
pls can you give me the answer of activity 2.2 of ncert science book ch-2 of class - 10
the chemical formula of POP is CaSO4.1/2H2O, How can H2O be (1/2) divided
WHAT IS BRISK EFFERVESCENCE?
What is the pH value of milk,curd ,saliva, washing soap, soap, toothpaste and tamarind?
what is difference between dilute and concentrated acids?
what is acid rain and what is its effect?
Name the gas evolved when dilute sulphuric acid acts on sodium carbonate. Writ the chemical
what is chlor-alkali process ? why it is named so? write down the reaction involved in this process ?
All Alkalis are bases but All bases are not Alkali.Explain with example.
What is the pH of 1M NaOH, 1M HCl solution, saliva before meal, saliva after meal and lemon juice? Give the pH with complete solutions.
What is dead burnt plaster?
what happens when gypsum is heated at 373k?
metal oxide + acids = salt + water give an example
Is clove oil an olfactory indicator? If yes, what happens to it in acidic and basic medium?
what happens when excess of CO2 is passed through lime water
what are mobile ions
what is formula of sodium zincate and how it is produced
what are the uses of plaster of paris/??????????
Which of these vanilla, onion and clove, can be used as olfactory indicators on the basis of your observations?
Two olfactory indicators are onion and vanilla extract. But how they are used to test whether the given substance in acidic or basic?
why is calcium sulphate hemihydrate called plaster of paris
write the pH value of:-
1) dilute hydrochloric acid
2) NaOH solution
3) dilute solution of ethanoic acid
4) lemon juice
6) dilute solution of sodium bicarbonate
plzzz... urgent !!
Are all acids soluble in water?
what is meant by water crystallization?how would you show the blue copper sulphate crystals contain water of crystallization?
Water of crystallization is the fixed number of water molecules present in the crystal of that salt. The chemical formula of hydrated copper sulphate is CuSO4.5H2O i.e., there are five water molecules present in one formula unit of copper sulphate. Therefore, water of crystallization of copper sulphate is 5.
Similarly, there are two water molecules present in one formula unit of gypsum (CaSO4.2H2O). Hence, water of crystallization of gypsum is 2.
however in hemihydrated Caso4 is known as POP it has half water of crystalization. Pl explain
why does a curry stain on white cloth becomes reddish-brown soap is scrubbed over it n then it turns yellow again if washed with plenty of water ????
Which of the following statements isincorrectregarding water of crystallisation?
It can be removed by sufficient heat.
It is in chemical combination with a crystal.
It is necessary for the maintenance of crystalline properties of the crystal.
Number of water of crystallization for a given compound depends on the temperature and pressure conditions.
In this question it is given the correct answer is "d" but if we take the example of Fe2O3 it contains xH2O it is because of the pressure conditions and temprature right ? and the water of crystalization just exists along with the element and not chemically combined
What is the difference between slaked lime and lime water
what is chlor-alkali process? write the chemical reaction taking place in the form of chemical equation.. what are the gases liberated at the anode and cathode respectively.
A milkman adds a very small amount of baking soda to fresh milk.
does he shift the pH of the fresh milk from 6 to slightly alkaline?
does this milk take a long time to set as curd?
what is the chemical composation chemical formula of red and blue litmus solution? What is yhe difference in there composation?
what is difference between slaked lime and quick lime?
Atmosphere of Venus is made up of thick white and yellowish clouds of sulphuric acid. Do you think life can exist there?
Q2.(a) Why is plaster of paris written as CaSO4.1/2 H2O? How is it possible to have half a water molecule attached to CaS4O?
Give any two important uses of this compound.
WHAT IS THE pH VALUE OF COLOURLESS AERATED DRINK, CARROT JUICE,COFFEE,TOMATO JUICE, TAP WATER , 1M NaOH,1M HCl,SOIL, BITTER GOURD JUICE, ONION JUICE?
URGENT PLZ ANSWER QUICKLY.
Iron does not burn on heating but iron filings burn vigorously when sprinkled in the flame of the burner. why??
Why is Sodium acetate written as CH3COONa and not as NaCH3COO ?
Why white phosphorus is more reactive than red phosphorus?
explain H X+M OH- MX HOH ???
Q2.why is plaster of paris witten as CaSO4.1/2 H2O? How is it possible to have half a water molecule attached to CaSO4?
For making cake, baking powder is taken. If at home your mother uses baking soda instead of baking powder in cake, (a) how will it affect the taste of the cake and why? (b) how can baking soda be converted into baking powder? (c) what is the role of tartaric acid added to baking soda?
Name a salt which does not contain water of crystallisation
identify the oxides from the following which will turn red litmus to blue
WHAT IS THE NATURE OF THESE OXIDES?
an aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic . Give reason . Explain this statement with the help of the chemical equation of the reaction .
How the concentration of hydronium ion affected when the solution of an acid is diluted?
Experiment 1: To find the pH of the following samples by using pH paper or universal indicator.
To a solution of sodium hydroxide in a test tube two drops of phenolphthalein is added (i) State the colour change observed (ii) If dil HCL is added drop wise to the solution, what will be the colour change (iii) on adding few drops of NaOH solution to the above mixture the colour of the solution reappears. Why ?
What Happens When Chlorine Is Passed Over dry Slaked Lime?Write THe chemical Euquation invovled in the Reaction.mention Three properties Of The Product?
what happens when zinc granules are heated with sodium hydroxide solution? Write the equation of the reaction which takes place.
Which gas is usually liberated when an acid reacts with a metal? Illustrate with an example. How will you test for the presence of this gas?
which oxide is more basic?
a)Al2O3 b) MgO c) SiO2 d) Na2O e) CO2
What is ph scale ?
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