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what is importance pH in our daily life
explain in detail the role of pH in our daily life.
Name the gas evolved when dilute sulphuric acid acts on sodium carbonate. Writ the chemical
Why does an aqueous solution of an acid conduct electricity ?
What happen when nitric acid is added to egg shell??????
A fuse wire repeatedly gets burnt when used with a good heater . It is advised to use a fuse wire of:
(a) more length (b) less radius (c) less length (D) more redius
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
how plaster of paris is prepared?What is its chemical formula and chemical name?
is mgcl2 an acidic, basic or neutral salt?
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 ?
pls can you give me the answer of activity 2.2 of ncert science book ch-2 of class - 10
Which of these vanilla, onion and clove, can be used as olfactory indicators on the basis of your observations?
the chemical formula of POP is CaSO4.1/2H2O, How can H2O be (1/2) divided
WHAT IS BRISK EFFERVESCENCE?
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
What is the pH value of milk,curd ,saliva, washing soap, soap, toothpaste and tamarind?
Acidic solutions conduct electricity and basic solutions do not conduct. Why? Then why is it given in the ncert textbook on pg. no.33 in the section "what you have learnt " that acidic and basic solutions in water conduct electricity. But as per activity 2.8 , it is given that acidic solutions conduct electricity but basic solutions do not . Which one is true and why? I am confused . Pls do help me out.
what is difference between dilute and concentrated acids?
what is acid rain and what is its effect?
identify the oxides from the following which will turn red litmus to blue
WHAT IS THE NATURE OF THESE OXIDES?
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 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.
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?
Is clove oil an olfactory indicator? If yes, what happens to it in acidic and basic medium?
what is formula of sodium zincate and how it is produced
what happens when excess of CO2 is passed through lime water
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?
Are all acids soluble in water?
what are the uses of plaster of paris/??????????
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 !!
what is meant by water crystallization?how would you show the blue copper sulphate crystals contain water of crystallization?
what are mobile ions
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 ????
Complete the reaction CaCO3
What is the difference between slaked lime and lime water
lemon, amla and orange all have citric acids. then what is the reason of change of taste?
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 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.
Iron does not burn on heating but iron filings burn vigorously when sprinkled in the flame of the burner. why??
Why white phosphorus is more reactive than red phosphorus?
chemical equation of dilute sulphuric acid on bleaching powder ?
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?
Why is HCL a stronger acid than acetic acid??Explain
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?
What happens if red litmus is brought near H2 gas?
(a) It catches fire
(b) it becomes blue
(c) It remains red
(d) it remains uneffected
Please also give the reason of your answer.
Name a salt which does not contain water of crystallisation
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?
Why is Sodium acetate written as CH3COONa and not as NaCH3COO ?
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?
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
what happens when zinc granules are heated with sodium hydroxide solution? Write the equation of the reaction which takes place.
A water insoluble calcium compound (A) on reacting with dil. H2SO4 released a colourless and odourless gas (B) with brisk effervescence. When gas (B) is passed through lime water, lime water turns milky and again formed compound A. Identify A and B and write the chemical equations for the reactions involved.
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 ?
explain H X+M OH- MX HOH ???
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