Select Board & Class
what is importance pH in our daily life
What does a dot in a chemical formula mean? eg CuSO4.5H2O. Does it mean that the one molecule ofCuSO4is attached to five molecules ofH2O??? pls expalin with help of diagram...
explain in detail the role of pH in our daily life.
Why does an aqueous solution of an acid conduct electricity ?
is mgcl2 an acidic, basic or neutral salt?
What happen when nitric acid is added to egg shell??????
Why is POP written as CaSO4.1/2H2O? How is it possible to have half a water molecule attached to CaSO4?
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
metal oxide + acids = salt + water give an example
how plaster of paris is prepared?What is its chemical formula and chemical name?
what is china dish and how is it preapred
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.
Name 20 naturally occuringacids with their source.
preparation of washing soda by solvay process
WHAT IS THE DIFFERENCE BETWEEN ALKALIS AND BASES ?
lemon, amla and orange all have citric acids. then what is the reason of change of taste?
pls can you give me the answer of activity 2.2 of ncert science book ch-2 of class - 10
Why do we take a soap solution in the experiment of reaction between acids and metals?
the chemical formula of POP is CaSO4.1/2H2O, How can H2O be (1/2) divided
Which base is contained by wasp sting?
WHAT IS BRISK EFFERVESCENCE?
Why is Sodium acetate written as CH3COONa and not as NaCH3COO ?
What is the pH value of milk,curd ,saliva, washing soap, soap, toothpaste and tamarind?
what is difference between dilute and concentrated acids?
Name the gas evolved when dilute sulphuric acid acts on sodium carbonate. Writ the chemical
what is acid rain and what is its effect?
a calcium compound which is a yellow white powder is used as a disinfectant and also in textile industry.Name the compound.Which gas is released when this compound is left exposed to air?
what is chlor-alkali process ? why it is named so? write down the reaction involved in this process ?
magnesium burns in oxygen to form magnesium oxide. Explain this reaction on the basis of electronic concept of oxidation and reduction?
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.
Are all acids soluble in water?
What is dead burnt plaster?
what happens when gypsum is heated at 373k?
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 is formula of sodium zincate and how it is produced
what happens when a non metallic oxide reacts with acid ?
what are the uses of plaster of paris/??????????
why does metal carbonate do not react with bases
Two olfactory indicators are onion and vanilla extract. But how they are used to test whether the given substance in acidic or basic?
what are mobile ions
why is calcium sulphate hemihydrate called plaster of paris
If barium nitrate [Ba(NO3)2] is mixed with sodium fluoride [NaF] in an aqueous solution, then BaF2 is formed as a precipitate. But why isn't NaNO3 formed?
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 !!
What is the nature of the salt if the pH of its solution is greater than 7 ?
name the acid and base would be used to prepare the folloing salts
1. pottasium sulphate
2. ammonium chloride
what is meant by water crystallization?how would you show the blue copper sulphate crystals contain water of crystallization?
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 ????
explain H X+M OH- MX HOH ???
What is the difference between slaked lime and lime water
what is the chemical composation chemical formula of red and blue litmus solution? What is yhe difference in there composation?
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.
write the formula of acid and base used to form the folloing given salts and mention them as acids and bases also:
a) sodium chloride
b) potassium sulphate
c) sodium acetate
d) ammonium chloride
e) zinc sulphate
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?
an element X forms an oxide which turns red litmus to blue. identify whether X is a metal or non metal?
what is difference between slaked lime and quick lime?
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.
name two natural indicator except litmus paper and which color they show when dipped in acid or base
Iron does not burn on heating but iron filings burn vigorously when sprinkled in the flame of the burner. why??
why are metallic oxides are called basic oxides while non metallic oxides are acidic oxides? give example.
Why white phosphorus is more reactive than red phosphorus?
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?
A student prepares aqueous solution of the following salts :-
Copper sulphate , ferrous sulphate , sodium sulphate , barium chloride
write the colour of each solution thus formed.
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
an acid can react with
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 .
1. how is plaster of paris obtained? what reaction is involved in the setting of a paste of plaster of paris? (1mark)
2.what color change is observed when hydrated copper sulphate is heated?
3.what preparations should be taken before preparation of plaster of paris?
How the concentration of hydronium ion affected when the solution of an acid is diluted?
what is the colour of CuCl2?
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 ?
Are all acids taste sour ? If no, give example.
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.
turmeric contains tartaric acid but it is considered a natural indicator why
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 ?
Copyright © 2022 Aakash EduTech Pvt. Ltd. All rights reserved.
E.g: 9876543210, 01112345678
We will give you a call shortly, Thank You
Office hours: 9:00 am to 9:00 pm IST (7 days a week)