There are four substances W, X, Y and Z. The sbustance W is a dark violet solid having diatomic molecules. A solution of W in alcohol is used as a common antiseptic C. The subsatance X is a white solid which is usually recovered from sea water on a large scale. The substance Y is a white solid which is insoluble in water and used in the form of small balls for the safe storage of woolen clothes. The substance Z is a yet another white solid which is used in making commonly used dry cells.

(a) Name (i) W (ii) X (iii) Y and (iv) Z.

(b) Out of W, X, Y and Z, which substace/substances can undergo sublimation?

(c) Which substance is organic in nature?

(d) What is the name of substance C?

(e) Which substance belongs to the halogen family?

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Solution

(a) The substance W is iodine, X is sodium chloride, Y is naphthalene balls and Z is ammonium chloride.
(b) W, Y and Z
(c) naphthalene
(d) Tincture of iodine
(e) Iodine

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Q. There are four substances W, X, Y and Z. The substance W is a dark violet solid having diatomic molecules. A solution of W in alcohol is used as a common antiseptic C. The substance X is a white solid which is usually recovered from sea water on a large scale. The substance Y is a whit solid which is insoluble in water and used in the form of small balls for the safe storage of woollen clothes. The substance Z is a yet another white solid which is used in making commonly used dry cells.

(a) Name (i) W (ii) X (iii) Y and (iv) Z.
(b) Out of W,X,Y and Z, which substance/substances can undergo sublimation?
(c) Which substance is organic in nature ?
(d) What is the name of substance C ?
(e) Which substance belongs to the halogen family ?

A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y, When water water is added to power Y, it dissolves partially to form another substance Z.

(a) What could metal X be ?

(b) What is power Y ?

(d) What is substance Z ? Name one domestic use of substance Z.

(e) Write a balanced chemical equation of the reaction which takes place when metal X burns is air to form powder Y.

Q. A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y. When water is added to powder Y, it dissolves partially to form another substance Z.
(a) What could metal X be?
(b) What is powder Y?
(c) With which substance metal X combines to form powder Y?
(d) What is substance Z? Name one domestic use of substance Z.
(e) Write a balanced chemical equation of the reaction which takes place when metal X burns in air to form powder Y.

A solid substance P which is very hard is used in the construction of many buildings, especially flooring. when substance P is heated strongly, it decomposes to form another solid Q and a gas R is given out. Solid Q reacts with water water the release of a lot of heat to form a substance S. When gas R is passed into a clear solution of substance S, then a white precipitable of substance T is formed . The substance T has the same chemical composition as starting substance P.

(a) What is substance P ? Write its common name as well as chemical formula.

(b) What is substance Q ?

(d) What is substance S ? What is its clear solution known as ?

(e) What is bustance T ? Name any two natural forms in which substance T occurs in nature.

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(i) Name the substance ‘X’ and write its formula.

(ii) Write the reaction of the substance ‘X’ named in (i) above with water.

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(a) The substance W is iodine, X is sodium chloride, Y is naphthalene balls and Z is ammonium chloride. (b) W, Y and Z (c) naphthalene (d) Tincture of iodine (e) Iodine

(a) The substance W is iodine, X is sodium chloride, Y is naphthalene balls and Z is ammonium chloride.
(b) W, Y and Z
(c) naphthalene
(d) Tincture of iodine
(e) Iodine