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Vedant Afre   from City Pride School Pradhikaran, Pune
Subject :Chemistry    Class : Class 6

In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : When the heavier component in a mixture settles after water is added to it, the process is called decantation.
Reason : Sand and water can be separated by churning.

A If both assertion and reason are true and reason is the correct explanation of assertion.
B If both assertion and reason are true but reason is not the correct explanation of assertion.
C If assertion is true but reason is false.
D If assertion is false but reason is true.


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Gayatri   from Sanskriti school, Pune
Subject :Chemistry    Class : Class 6

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Navya   from Oberoi International School, mumbai
Subject :Chemistry    Class : Class 6

In the following questions, a statement of assertion is followed by a statement of reason. Mark the correct choice as:
Assertion : Naphthalene balls are kept in open air in order to maintain its state.
Reason : The process of conversion of solid state to liquid is sublimation.

A If both assertion and reason are true and reason is the correct explanation of assertion.
B If both assertion and reason are true but reason is not the correct explanation of assertion.
C If assertion is true but reason is false.
D If assertion is false but reason is true.


How is sublimation a change of solid to liquid? Isn't it solid to gas??

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Anju Singh   from Asian World School, Jaipur
Subject :Chemistry    Class : Class 7

The process in which an acid completely reacts with a base to form salt and water is called neutralisation. The salts which are formed may be acidic, basic or neutral. The substances which do not bring any change in the colour of the indicators are called neutral substances.
When sodium hydroxide is added to dilute hydrochloric acid

A sodium chloride salt is formed.
B sodium chloride salt and water are formed.
C sodium chloride salt and water are formed and heat is evolved.
D sodium chloride salt and water are formed and heat is absorbed.

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Shreyanshi   from Don Bosco, Navi Mumbai
Subject :Chemistry    Class : Class 8

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Vansh   from Tagore International School, New Delhi
Subject :Chemistry    Class : Class 6

Refer to the given flow chart.

Identify P, Q, R and S and select the correct option.

P Q R S
A Cotton,
Balsam		 Coconut,
Lotus		 Madar,
Xanthium		 Pea,
Dandelion
B Dandelion,
Hiptage		 Coconut,
Lotus		 Xanthium,
Urena		 Geranium,
Balsam
C Madar,
Hiptage		 Coconut,
Xanthium		 Dandelion,
Litchi		 Balsam,
Cotton
D Madar,
Cotton		 Coconut,
Dandelium		 Xanthium,
Geranium		 Balsam,
Hiptage


Pls explain this one

Ans 1:

Vansh from Tagore International School, New Delhi
Class : Class 6
FAST

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Soham   from Mothers International School, New Delhi
Subject :Chemistry    Class : Class 9

Ans 1:

Yogi Shah from SNV, Anand
Class : Class 9

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Soham   from Mothers International School, New Delhi
Subject :Chemistry    Class : Class 9

Which of the following statements about Rutherford’s model of atom are correct?
(i) Considered the nucleus as positively charged
(ii) Established that the α–particles are four times as heavy as a hydrogen atom
(iii) Can be compared to solar system
(iv) Was in agreement with Thomson’s model

A (i) and (iii)
B (ii) and (iii)
C (i) and (iv)
D only (i)


the comparison to solar system was done by Bohr and not by Rutherford.

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Aadarsh S Nair   from BVM Global, Chennai
Subject :Chemistry    Class : Class 6

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Nivedha   from Shri Aurobindo Memorial School, Bangalore
Subject :Chemistry    Class : Class 6

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