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प्रश्न
Diamond : electric insulator : : _______ : electric conductor
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उत्तर
Diamond : electric insulator : : graphite : electric conductor
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संबंधित प्रश्न
Give two examples of amphoteric oxides.
What are amphoteric oxides?
Give reason:
Sodium, potassium and lithium are stored under oil.
Which of the following oxide(s) of iron would be obtained on the prolonged reaction of iron with steam?
Which of the following metals liberate hydrogen with 5% HNO3?
(i) Cu
(ii) Zn
(iii) Mn
(iv) Mg
Silver articles become black on prolonged exposure to air. This is due to the formation of
If copper is kept open in air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of
When a metal X is treated with cold water, it gives a basic salt Y with molecular formula XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire. Identify X, Y and Z and also write the reaction involved.
Metals generally react with dilute acids to produce hydrogen gas. Which one of the following metals does not react with dilute hydrochloric acid?
Which of the following reacts with cold water vigorously?
Out of three metals, sodium, calcium and aluminium, which metal reacts most with water? Give the equation of reaction with all three metals.
Answer the questions based on the figure below:
- Which reaction is shown in the figure?
- Which gas is evolved in the reaction?
- Give an example of reactants that rapidly show this reaction. Give equations.
- Give an example of reactants that do not react rapidly.
- In what condition will reactants of (c) part react? Give equation.
Metal oxides generally react with acids, but few oxides of metal also react with bases. Such metallic oxides are:
- MgO
- ZnO
- Al2O3
- Cao
Select the appropriate state symbols of the products given as X and Y in the following chemical equation by choosing the correct option from table given below:
\[\ce{Zn_{(s)} + H_2SO_{4(l)} ->ZnSO_{4(X)} + H_{2(Y)}}\]
Write a chemical equation showing the ionic products formed on dissolving potassium hydroxide in water.
On adding dilute sulphuric acid to a test tube containing a metal ‘X’, a colourless gas is produced when a burning match stick is brought near it. Which of the following correctly represents the metal ‘X’?
