Metals and Non-metals - Class 10 - Science
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Back Questions - Metals and Non-metals | NCERT | Science | Class 10
Which of the following pairs will give displacement reactions?
(a) $\mathrm{NaCl}$ solution and copper metal
(b) $\mathrm{MgCl}_{2}$ solution and aluminium metal
(c) $\mathrm{FeSO}_{4}$ solution and silver metal
(d) $\mathrm{AgNO}_{3}$ solution and copper metal.
A displacement reaction is a type of reaction where a more reactive metal displaces a less reactive metal from its compound.
To determine which pairs will give displacement reactions, we need to refer to the reactivity series of metals, which lists metals in order of decreasing reactivity. A metal higher in the series can displace a metal lower in the series from its compound.
Here's the order of the metals mentioned, from more reactive to less reactive according to the reactivity series:
$$ \text{Aluminium (Al)} > \text{Magnesium (Mg)} > \text{Iron (Fe)} > \text{Copper (Cu)} > \text{Silver (Ag)} > \text{Sodium (Na)} $$
With this in mind, let's evaluate each pair:
(a) NaCl solution and copper metal: Sodium (Na) is more reactive than copper (Cu), so copper cannot displace sodium from NaCl. There will be no displacement reaction.
(b) MgCl₂ solution and aluminium metal: Aluminium (Al) is more reactive than magnesium (Mg), so aluminium can displace magnesium from MgCl₂. There will be a displacement reaction.
(c) FeSO₄ solution and silver metal: Iron (Fe) is more reactive than silver (Ag), so silver cannot displace iron from FeSO₄. There will be no displacement reaction.
(d) AgNO₃ solution and copper metal: Copper (Cu) is more reactive than silver (Ag), so copper can displace silver from AgNO₃. There will be a displacement reaction.
Therefore, the pairs that will give displacement reactions are:
(b) MgCl₂ solution and aluminium metal(d) AgNO₃ solution and copper metal
Which of the following methods is suitable for preventing an iron frying pan from rusting?
(a) Applying grease
(b) Applying paint
(c) Applying a coating of zinc
(d) All of the above.
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Sign up nowAn element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be
(a) calcium
(b) carbon
(c) silicon
(d) iron.
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Sign up nowFood cans are coated with tin and not with zinc because
(a) zinc is costlier than tin.
(b) zinc has a higher melting point than tin.
(c) zinc is more reactive than tin.
(d) zinc is less reactive than tin.
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Sign up nowYou are given a hammer, a battery, a bulb, wires and a switch.
(a) How could you use them to distinguish between samples of metals and non-metals?
(b) Assess the usefulness of these tests in distinguishing between metals and non-metals.
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Sign up nowWhat are amphoteric oxides? Give two examples of amphoteric oxides.
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Sign up nowName two metals which will displace hydrogen from dilute acids, and two metals which will not.
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Sign up nowIn the electrolytic refining of a metal $\mathrm{M}$, what would you take as the anode, the cathode and the electrolyte?
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Sign up nowPratyush took sulphur powder on a spatula and heated it. He collected the gas evolved by inverting a test tube over it, as shown in figure below.
(a) What will be the action of gas on
(i) dry litmus paper?
(ii) moist litmus paper?
(b) Write a balanced chemical equation for the reaction taking place.
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Sign up nowState two ways to prevent the rusting of iron.
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Sign up nowWhat type of oxides are formed when non-metals combine with oxygen?
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Sign up nowGive reasons
(a) Platinum, gold and silver are used to make jewellery.
(b) Sodium, potassium and lithium are stored under oil.
(c) Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
(d) Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
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Sign up nowYou must have seen tarnished copper vessels being cleaned with lemon or tamarind juice. Explain why these sour substances are effective in cleaning the vessels.
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Sign up nowDifferentiate between metal and non-metal on the basis of their chemical properties.
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Sign up nowA man went door to door posing as a goldsmith. He promised to bring back the glitter of old and dull gold ornaments. An unsuspecting lady gave a set of gold bangles to him which he dipped in a particular solution. The bangles sparkled like new but their weight was reduced drastically. The lady was upset but after a futile argument the man beat a hasty retreat. Can you play the detective to find out the nature of the solution he had used?
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Sign up nowGive reasons why copper is used to make hot water tanks and not steel (an alloy of iron).
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Sign up nowExtra Questions - Metals and Non-metals | NCERT | Science | Class 10
Assertion: In froth flotation process sodium ethyl xanthate is used as collector.
Reason: Sulphide ores are water soluble.
Option A) Both assertion and reason are correct and the reason is the correct explanation for the assertion.
Option B) Both assertion and reason are correct but the reason is not the correct explanation for the assertion.
Option C) Assertion is correct but the reason is wrong
Option D) Assertion is incorrect but the reason is correct
Assertion: In froth flotation process, sodium ethyl xanthate is indeed used as a collector. Sodium ethyl xanthate functions by adhering to the metal sulfides, increasing their hydrophobicity, which is crucial for their separation.
Reason: The statement that sulphide ores are water soluble is incorrect. In reality, most sulphide ores are not soluble in water, which is a significant reason why the froth flotation method is employed – to take advantage of the ores' lack of solubility and separate them using their differences in hydrophobic characteristics.
Given the above analysis:
The Assertion is correct
The Reason is incorrect
Thus, the correct answer is:
Option C) Assertion is correct but the reason is wrong
State the characteristics of groups in the periodic table.
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Sign up now"What is Raney nickel?"
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Sign up nowThe electronic configurations of atoms of three elements A, B, and C are $(2,8,1)$, $(2,8,6)$, and $(2,8,18,7)$ respectively. Which option classifies the elements A, B, and C as metals and non-metals correctly?
A) A -> Non-Metal, B -> Non-Metal, C -> Non-Metal
B) A -> Metal, B -> Metal, C -> Metal
C) A -> Metal, B -> Non-Metal, C -> Non-Metal
D) A -> Metal, B -> Metal, C -> Non-Metal
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Sign up nowState the major difference between the composition of steel and stainless steel. Why is stainless steel considered better than steel?
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Sign up nowObserve the table and identify metals and non-metals. Select the correct option. \begin{tabular}{|c|c|c|} \hline S. No. & Set 1 & Set 2 \ \hline 1. & Sodium (Na) & Oxygen (O) \ \hline 2. & Magnesium (Mg) & Chlorine (Cl) \ \hline 3. & Iron (Fe) & Helium (He) \ \hline 4. & Gold (Au) & Sulphur (S) \ \hline 5. & Calcium (Ca) & Carbon (C) \ \hline \end{tabular}
A) Set 1: metals and set 2: non-metals.
B) Set 1: non-metals and set 2: metals.
C) Both sets 1 & 2 are metals.
D) Both sets 1 & 2 are non-metals.
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