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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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Subject :Chemistry    Class : Class 8

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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:

Class : Class 6
20

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Subject :Chemistry    Class : Class 9

Ans 1:

Class : Class 9

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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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Subject :Chemistry    Class : Class 6

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Subject :Chemistry    Class : Class 6

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Subject :Chemistry    Class : Class 6

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Subject :Chemistry    Class : Class 6

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Subject :Chemistry    Class : Class 6

In this section, each question has two matching lists. Choices for the correct combination from List-I and List-II are given as options (A), (B), (C) and D out of which one is correct.

List-I List-II
(P) Strong and flexible 1. Bell
(Q) Water proof and flexible 2. Hammock
(R) Hard and sonorous hard 3. Cable
(S) Transparent and 4. Window pane

Code :
P Q R S
A 3 2 1 4
B 4 3 2 1
C 2 3 1 4
D 1 2 3 4


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