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प्रश्न
The elements whose oxides can turn litmus solution red are:
(a) lithium and sodium
(b) copper and potassium
(c) carbon and hydrogen
(d) phosphorus and sulphur
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उत्तर
(d) phosphorus and sulphur
Phosphorus and sulphur are non-metals whose oxides are acidic in nature. These oxides turn blue litmus solution to red.
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संबंधित प्रश्न
Write the electron-dot structures for sodium, oxygen and magnesium.
Name two metals which form amphoteric oxides.
With the help of examples, describe how metal oxides differ from non-metal oxides.
Why does aluminium not react with water under ordinary conditions?
What happens when calcium reacts with water? Write the chemical equation of the reaction of calcium with water.
Name one metal which displaces copper from copper sulphate solution and one which does not.
Which non-metal has been placed in the reactivity series of metals?
Out of aluminium, copper, calcium and tin, the most reactive metal is:
(a) aluminium
(b) copper
(c) tin
(d) calcium
An element X reacts with hydrogen, when heated, to form a covalent hydride H2X. If H2X has a smell of rotten eggs, the element X is likely to be:
(a) carbon
(b) sulphur
(c) chlorine
(d) phosphorus
The elements whose oxides can turn litmus solution blue are:
(a) carbon and sulphur
(b) sodium and carbon
(c) potassium and magnesium
(d) magnesium and sulphur
Which one of the following four metals would be displaced from the solution of its salt by the other three metals?
(a) Zn
(b) Ag
(c) Cu
(d) Mg
What is the cause of chemical bonding (or chemical combination) of atoms of elements?
Write the name and formula of a molecule made up of three atoms of oxygen.
Choose the correct alternative and rewrite the following:
Which of the following is lue in colour?
Rewrite the following statement by selecting the correct option.
A solution of Al2(SO4)3 in water is _____________.
Answer the following question:
An element X on reacting with oxygen forms an oxide X2O. This oxide dissolves in water and turns red litmus blue. State whether element X is metal or a non - metal. Explain with a proper example.
Which one among the following is an acidic oxide?
Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?
Generally, metals are solid in nature. Which one of the following metals is found in liquid state at room temperature?
Metals are generally hard. Which of the following metals is an exception and can be cut with a knife?
