Test

What do you observe when you drop a few drops of acetic acid to a test tube containing

What do you observe when you drop a few drops of acetic acid to a test tube containing:

a)Phenolphthalein

b) Universal indicator

c) Distilled water
 d) Sodium hydrogen carbonate

i) Acetic acid will remain colorless in phenolphthalein.

ii) Acetic acid will dissolve in distilled water forming a clear solution.

iii) Universal indicator gives orange color with acetic acid.

iv) Sodium hydrogen carbonate will give brisk effervescence due to the formation of CO2 gas



15th April 2019

ncert solution

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What is the greatest number which exactly divides 110, 154 and 242?

What is the greatest number which exactly divides 110, 154 and 242?

Solution

The required number is the HCF of 110, 154 and 242.

Prime factorization of numbers is:

110 = 2 × 5 × 11

154 = 2 × 7 × 11

242 = 2 × 11 × 11

HCF = 2 × 11 = 22

 

29th March 2019

vitorr maths

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