Draw the structural formula for each of the following:

1. 2, 3 - dimethyl butane
2. diethyl ether
3. propanoic acid

Baeyer's process is used to concentrate bauxite ore to alumina.

Give balanced chemical equations for the reaction taking place for its conversion from bauxite to alumina.

Briefly answer: Name a mineral used to generate nuclear power

Use graph paper for this question. Take 1 cm = 1 unit on both x and y axes.

1. Plot the following points on your graph sheets: A (-4, 0), B (-3, 2), C (0, 4), D (4, 1) and E (7, 3)      
2. Reflect the points B,
...

1. A wire of length 80 cm has a frequency of 256 Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz.
2. A certain sound has a frequency of 256 hertz and a
...

Why is inland waterways declining in its importance? Give two reasons for your answer.

State your observations when

Dilute Hydrochloric acid is added to Sodium thiosulphate

The figure given below is a diagrammatic representation of a part of the cross section of the root in the root hair zone. Study the same and then answer the questions that follow:

1. Name the parts
...

A ray of light falls normally on a rectangular glass slab. Draw a ray diagram showing the path of the ray till it emerges out of the slab.

Use ruler and compass for this question. Construct a circle of radius 4.5 cm. Draw a chord. AB = 6 cm.

1. Find the locus of points equidistant from A and B. Mark the point where it meets the circle as
...

Calculate the percentage of:

1. Fluorine
2. Sodium and
3. Aluminium

in sodium aluminium fluoride [Na₃AlF₆], to the nearest whole number. [Atomic Mass: Na = 23, Al = 27, F = 19]

The figure below shows a simple pendulum of mass 200 g. It is displaced from the mean position A to the extreme position B. The potential energy at the position A is zero. At the position B the...

Give a reason: Jaipur has a higher annual range of temperature than Mumbai.

Give the names of two leaders who led the Home Rule Movement in India.

Name the last Viceroy of India. State any one of the provisions of the Indian Independence Act of 1947.

Conversion of ethanol to ethene by the action of concentrated sulphuric acid is an example of ____ . (dehydration / dehydrogenation / dehydrohalogenation)