Write the structural formula of the two isomers of butane

Name the soil which: occurs exsitu

1. State two differences between “Heat Capacity” and “Specific Heat Capacity”.
2. Give a mathematical relation between Heat Capacity and Specific Heat Capacity.

State two uses of limestone.

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]

1. A fuse is rated 8A. Can it be used with an electrical appliance rated 5 KW, 200 V? Give a reason.
2. Name two safety devices which are connected to the live wire of a household electric circuit.

Identify the gas evolved and give the chemical test in each of the following cases:

1. Dilute hydrochloric acid reacts with sodium sulphite.
2. Dilute hydrochloric acid reacts with iron (II) sulphide.

If an element has seven electrons in its outermost shell then it is likely to have the __________ (largest / smallest) atomic size among all the elements in the same period.

Name the countries that formed the Axis Bloc, during World War II.

(i) What is the relation between the refractive index of water with respect to air (_aµ_w) and the refractive index of air with respect to water (_wµ_a).

(ii) If the refractive index of water with...

Name the two main Associations that were the precursors of the Indian National Congress.

(i) Name the system which enables us to locate underwater objects by transmitting ultrasonic waves and detecting the reflecting impulse.

(ii) What are acoustically measurable quantities related to...

A salt prepared by displacement reaction is _____. (ferric chloride, ferrous chloride, silver chloride)

The diagrams given below represent the relationship between a mouse and a physiological process that occurs in green plants. Study the diagrams and answer the questions that follow:

1. Name the
...

An atomic nucleus A is composed of 84 protons and 128 neutrons. The nucleus A emits an alpha particle and is transformed into a nucleus B.

1. What is the composition of B?
2. The nucleus B emits a beta
...

Write the equation for the formation of aluminum at the cathode during the electrolysis of alumina.