1. What is the role of ultraviolet rays in the purification of water in modern water purifiers?
2. Under which condition does Bunsen burner produce a luminous flame and a non-luminous fame?
Give reasons in support of
your answer. compelt and incomplete combustion
3. Anhydride of an acid X contains 2 phosphorous atoms,
5
oxygen atoms.
If this acid X is made to react
with bases like sodium hydroxide, calcium hydroxide and aluminum hydroxide, what will the formulae
of the corresponding normal salts formed be?
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4. A compound 'X' of silver on treatment with barium chloride gives the respective products Y and Z.
X on treatment with sodium hydroxide gives A and B where A can also be obtained when silver is
attacked by ozone and B is the salt of an oxy acid of nitrogen which ends with the suffix*-ate'. Identify
and give the chemical formulae of the substances X, Y, Z, A and B?
5. The salt of hypohalous acid is prepared from the respective components namely halogen and the
corresponding metallic hydroxide. The metal is the one which possesses the number of electrons in
the ratio of 1:4:4:1 which corresponds to namely K, L, M, N shells respectively and the halogen is
a greenish-yellow colour gas which can displace bromine from magnesium bromide. Identify the salt
and the respective components.
Answers
Answer:
1)Ultraviolet (UV) rays penetrate harmful pathogens in your home's water and destroy illness-causing microorganisms by attacking their genetic core (DNA). UV water purification is usually used with other forms of filtration such as reverse osmosis systems or carbon block filters.
2)A Bunsen burner, named after Robert Bunsen, is a kind of gas burner used as laboratory equipment; it produces a single open gas flame, and is used for heating, sterilization, and combustion
The gas can be natural gas (which is mainly methane) or a liquefied petroleum gas, such as propane, butane, or a mixture.
3)Anhydride of an acid X contains 2 phosphorus atoms, 5 oxygen atoms. If this acid X is made to react with bases like sodium hydroxide, calcium hydroxide and aluminum hydroxide, what will the formulae of the corresponding normal salts formed be? Solution : (i) Identification of X from the respective anhydride.
)5(i) Identification of X from the respective anhydride.
(ii) Predicting the formulae of the bases based on nomenclature.
(iii) Nature of reaction between acid X and respective bases.
(iv) Predicting the valency of negative radical inX.
(v) Predicting the valency of sodium, calcium and aluminium respectively.
(vi) Applying criss cross method to determine formulae of the corresponding salts.
4)silver nitrate + barium chloride give barium nitrate +silver chloride
Explanation:
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