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pH value of :
1) saliva (before meal)
2)saliva (after meal)
4)colourless aerated drink
A student has four samples A, B,C and D containing dil.HCl, aq KCl, dil.NaOH, and distilled water respectively. The solutions with equal pH are:
(a) A and B
(b) B and C
(c) C and D
(d) B and D
can anyone give me some problems in the lesson electricity and magnetic field of electric current except the problems which is in the book
What is the Difference between Alkaline and basic?
what is pH paper exactly(full form)????
what is the ph of dil. sodium bicarbonate????
what is pH paper
A student adds a few drops of universal indicator to a solution and observes colour changes to orange. The solution would be : (a) strong acid (b) strong base (c) weak acid (d) weak base
What is the difference between pH paper and universal indicator ?
What will be the colour of the pH paper when we wil drop a liquid called Dilute Hydrochloric Acid , Dilute NaOH solution , Dilute Ethanoic Acid Solution ,Lemon Juicce, Water ,Dilute Sodium Bicarboate Solution. And pH paper value also.
1.Bottle A contains a dilute solution of vinegar and bottle B Contains sodium carbonate solution. The colour seen in pH paper dipped in A and B are _________and____________
2. A student took the following samples to find out their pH using pH paper. The teacher remarked that one of the samples taken was not proper.The teacher was referring to-
a. dilute hydrochloric acid b.lemon juice c.washing soda d. soap solution
what is the water of crystallisation of plaster of paris and gypsum. why is it so?
Rahul adds aqueos solution of barium chloride to an aqueous solution of sodium sulphate. He would observe that
a. a pungent smelling gas is evolved.
b. the colour of the solution turns red.
c. a yellow pricipitate is formed after some time.
d. a white pricipitate is formed almost immediately.
solutuion of kmno4 is added to ethanol drop by drop ...does the color of kmno4 persist when it is added initially?????why does color of kmno not disappears when excess is added????? plz help me dear experts and friends...
can some one tel about it
what do you mean by brisk effervescence?
Are hydrogen and co2, both odourless and colourless gas?
which gas shows brisk effervescence?
THe pH of a given solution is 12.5.On adding a drop of universal indicator to the solution It is observed the change in colour as
a)orange b)blue c)yellow d)red
what is combination reaction
what is the ph value of urea
Which of the following ions concentration is shown by pH in basic solutions ?
A) OH- B) OH+ C)H+ D)H-
What is the difference between adolescence and puberty? if you no the answer then please tell..are you intelligent?
what is the common between marble and eggshell?how can you test this common feature?
A student added red litmus solution to A and observed that it changed into blue. When she added another solution B to A in excess she observed that solution turned red.THe solution Aand B is
a) KOH and KCL b) HCL and KOH c) KOH and HCL d) HCL and H2CO3
what is relative velocity
to show the combination reaction between quick lime with water is an exothermic reaction
what is the color of the solutions of NAOH , NAHCO3 and CH3COOH
What does the scxale look like??
magnesium ribbion float on water because of bubbles.but question is that waht bubbles provide magnesium ribbon to float?
Thanx for providing the science practicals too
How r pH and pOH related??????????????????/
how can we make a universal indicator
WHAT IS PH VALUE
are there live tutors?
A student detected the pH of four unknown solutions A,B,Cand D as flolows 11,5,7 and 2 predict the nature of the solutions
where can i get cbse last 20 or 10 years board papers of all subjects?
How is the pH value found?
what is bascicity of acids?
wat is the formula of washing soda,caustic soda,common salt,limestone
what is pH paper?
What is distilled water?
Name the process due to which food materials like butter gets spoiled due to oxidation at room temperature if kept for long time.what happens to its taste and smell?
the colour of the pH paper changes according to the concentration of the hydrogen ions, so when the acid or base is added to water the hydrogen ions quantity is bound to change then why isn't it changing? is there a specific colour for each acid or base?
ph of nh4oh,nh4cl,
A moist litmus paper is introduced in a gas jar containing a gas. After sometime the paper becomes colourless. The gas present in the jar is ? (1.hydrogen2.Carbon dioxide 3.Sulphur Dioxide 4.Ammonia) Why?
when a student dipped pH paper in the given solution, he found green colour. The given solution may be :
why litmus paper called as ph paper
i have got different values pH scale and the colour changes are also different in some samples. i havent used different solutions ,they are the same as the one in this video. how is this possible ? are there different types of pH paper or is there any mistake in the activity.
what will happen if we mix water into acids?
A student took the following samples to find out their pH using pH paper. The teacher remarked that one of the samples taken was not proper. The teacher was referring to,
a) Dil.HCl b) Lemon juice c) Washing Soda d) Soap solution
find the pH solution using the universal indicator solution of the following solutions:-HCL,NaOH,acetic acid,lemon juice,water,NaHCO3
(PLEASE ANSWER THESE QUESTIONS.)
1.WHAT IS THE COLOR AND PH OF ACETIC ACID?
2.WHAT ARE THE CONSTITUENTS OF UNIVERSAL INDICATOR?
3.FOR A NEUTRAL SOLUTION PH OF A SOLUTION IS 10 TO THE POWER -7 ....I MEAN WHY IS IT -7 . WHY NOT +7.WHAT DOES THAT MEAN.
GIven below are the steps to be followed for performing starch test on a green leaf.
1.Boil the leaf in alcohol 2.Boil the leaf in water 3.Dip the leaf in iodine solution 4.Wash the leaf in water.
The correct sequence of steps is'
a)1,4,2,3 b)2,4,1,3 c)2,1,4,3 d) 4,1,2,3
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