MEDIUM
10th ICSE
IMPORTANT
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A hydrocarbon having general formula CnH2n-2 reacts with halogens. The reaction is known as 

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Important Questions on Practice Paper-7

EASY
10th ICSE
IMPORTANT
Among rubidium, potassium, lithium, and sodium, the element which has the least ionisation potential is:
EASY
10th ICSE
IMPORTANT

Name the term defined as follows:

The process in which an atom or ion loses electrons.

EASY
10th ICSE
IMPORTANT

Name the term defined as follows:

The process in which carbon atoms share electrons with one another to form long chains.

EASY
10th ICSE
IMPORTANT

Name the term defined as follows:

A salt in which the hydrogen of an acid has been wholly replaced by a metal.

MEDIUM
10th ICSE
IMPORTANT

Name the term defined as follows:

The number of protons in the nucleus of an atom.

EASY
10th ICSE
IMPORTANT

Name the term defined as follows:

A hydrocarbon with double or triple bonds.

HARD
10th ICSE
IMPORTANT

The following observations are recorded during a series of experiments involving substance X:

When substance X is heated a reddish-brown gas is evolved along with a gas that relights a glowing wooden splinter. A yellow residue remains in the test tube.

(1) Name the reddish-brown gas. 

(2) Name the gas which relights the glowing wooden splinter.

MEDIUM
10th ICSE
IMPORTANT

The following observations are recorded during a series of experiments involving substance X:

When substance X is heated a reddish-brown gas is evolved along with a gas that relights a glowing wooden splinter. A yellow residue remains in the test tube. In the addition of ammonium hydroxide to a solution of X, a white precipitate is formed which is insoluble in excess ammonium hydroxide. What is the cation present in substance X?