Dry hydrogen chloride gas can be collected by ____ displacement of air. (downward / upward)

Given below are diagrams showing the different stages in the process of fertilisation of an egg in the human female reproductive tract

Study the diagrams and answer the questions:

1. Arrange the
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(i) Name the physical quantity which is measured in calories.

(ii) How is calorie related to the S.I unit of that quantity?

A gas cylinder contains 12 x 10²⁴ molecules of oxygen gas:

If Avogadro's number is 6x10²³; Calculate:

1. the mass of oxygen present in the cylinder.
2. the volume of oxygen at S.T.P. present in the
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Answer the following questions based on the extraction of aluminium from alumina by Hall-Heroult’s Process:

1. What is the function of cryolite used along with alumina as the electrolyte?
2. Why is powdered
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The diagram given below represents a plant cell after being placed in a strong sugar solution. Study the diagram and answer the questions that follow: 

1. What is the state of the cell shown in the
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Perilymph or endolymph (Which one surrounds the organ of Corti?)

Read the extract given below and answer the questions that follow:

Launcelot: But, I pray you, ergo, old man, ergo,
I beseech you, talk you of young Master Launcelot?

Gobbo: Of Launcelot, an’t...

With reference to the Mass Phase of the National Movement under the leadership of Gandhi, answer the following:

1. Briefly explain the Dandi March of 1930.
2. State any three reasons for the launching of the
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NaOH solution when added to the Solution (A) gives a reddish brown precipitate.

Identify the cations in each of the following case:

The angle of elevation from a point P of the top of a tower QR, 50 m high is 60^o and that of the tower PT from a point Q is 30^o. Find the height of the tower PT, correct to the nearest metre.

Anhydrous iron(III) chloride is prepared by:

1. direct combination
2. simple displacement
3. decomposition
4. neutralization

Mention any three functions of the International Court of Justice.

Laboratory preparation of ammonia from ammonium chloride.

Calculate the number of gram atoms in 4.6 grams of sodium (Na = 23).

The horrors of the two World Wars, led to the formation of the United Nations Organisation, while the formation of the Non-Aligned Movement followed later. In this context, Explain any three...