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Ashutosh Saini
Subject: Science
, asked on 16/2/18
How is pop chemical you different from gypsum. how may this interconverted and write the uses of pop
Answer
1
Ashutosh Saini
Subject: Science
, asked on 16/2/18
Bleaching powder form a milky solution in water explain
Answer
2
Aayushi Rohilla
Subject: Science
, asked on 15/2/18
Illustrate any 3 chemical properties of acids. Write examples.
Answer
5
Khushi Jain
Subject: Science
, asked on 13/2/18
Neutral color of phenolphthalein
Answer
1
Champ Jee
Subject: Science
, asked on 12/2/18
Reaction of zinc granules with nitric acid.
Answer
3
Medha Bhattacharya
Subject: Science
, asked on 12/2/18
Someone plz ans this question
Answer
3
Medha Bhattacharya
Subject: Science
, asked on 12/2/18
Someone plz ans this question
Q.23. In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations.
Which one of the above observations is incorrect and why?
Answer
3
Medha Bhattacharya
Subject: Science
, asked on 12/2/18
Someone plz ans this question
Answer
1
Medha Bhattacharya
Subject: Science
, asked on 12/2/18
Someone plz ans this question
Q.7. The pH value of a strong acid solution is 5.0. What will be the pH of the solution obtained after diluting the given solution 100 time?
Answer
3
Medha Bhattacharya
Subject: Science
, asked on 12/2/18
Someone plz ans this question
Q.23. In an experiment to study the properties of acetic acid, answer the following questions.
(i) What happens when ethanoic acid reacts with sodium metal? Give a balanced chemical equation also.
(ii) What happens when the brisk effervescence of
C
O
2
gas is passed through lighted splinter?
Answer
2
Medha Bhattacharya
Subject: Science
, asked on 12/2/18
Someone plz ans this question
Q.20. (i) Why do fire flies glow at night?
(ii) Write chemical reaction for soda acid fire extinguisher. How does it work?
OR
An alkane has molecular mass 86. Find out its molecular formula. Write down all possible isomers for this molecular formula.
Answer
2
Medha Bhattacharya
Subject: Science
, asked on 12/2/18
Someone plz ans this question
Q.15. Bring out difference between metals and non-metals with respect to :
(i) Formation of ions
(ii) Discharge of ions
(iii) Nature of oxides
Answer
2
Medha Bhattacharya
Subject: Science
, asked on 12/2/18
Someone plz ans this question
Q.2. Zinc and aluminium both react with dilute hydrochloric acid. Why does zinc react more quickly than aluminium?
Answer
2
Medha Bhattacharya
Subject: Science
, asked on 12/2/18
Someone plz ans this question
Q.12. (i) Up to which element, the law of octaves was found to be applicable?
(ii) The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
Answer
2
Medha Bhattacharya
Subject: Science
, asked on 12/2/18
Someone plz ans this question
Answer
3
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Q.23. In an experiment to test the pH of a given sample using pH paper, four students recorded the following observations.
Which one of the above observations is incorrect and why?
Q.7. The pH value of a strong acid solution is 5.0. What will be the pH of the solution obtained after diluting the given solution 100 time?
Q.23. In an experiment to study the properties of acetic acid, answer the following questions.
(i) What happens when ethanoic acid reacts with sodium metal? Give a balanced chemical equation also.
(ii) What happens when the brisk effervescence of gas is passed through lighted splinter?
Q.20. (i) Why do fire flies glow at night?
(ii) Write chemical reaction for soda acid fire extinguisher. How does it work?
OR
An alkane has molecular mass 86. Find out its molecular formula. Write down all possible isomers for this molecular formula.
Q.15. Bring out difference between metals and non-metals with respect to :
(i) Formation of ions
(ii) Discharge of ions
(iii) Nature of oxides
Q.2. Zinc and aluminium both react with dilute hydrochloric acid. Why does zinc react more quickly than aluminium?
Q.12. (i) Up to which element, the law of octaves was found to be applicable?
(ii) The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.