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Question 11 Mark
Give balanced chemical equations for of the following : Reaction of ammonia with sulphuric acid.
Answer
$2NH_3+H_2SO_4 \rightarrow (NH_4)_2SO_4$(ammonium sulphate)
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Question 21 Mark
Give balanced chemical equations for the following : Reaction of ammonia with excess chlorine
Answer
$NH_3 + 3Cl_2→ NCl_3 + 3HCl$ (nitrogen trichloride)
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Question 31 Mark
Give balanced chemical equations for each of the following : Lab preparation of ammonia using an ammonium salt
Answer
$2NH_4Cl + Ca(OH)_2→CaCl_2+ 2H_2O + 2NH_3$
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Question 41 Mark
Given one test can be used to detect the presence of the ion produced
Answer
Red litmus turns blue, methyl orange turns yellow and phenolphthalein turns pink.
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Question 51 Mark
Name the other ion formed when ammonia dissolves in water
Answer
Hydroxyl $(OH^-)$ ion other than ammoniumion
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Question 61 Mark
Give balanced equation of :
Action of heat an a mixture of copper an nitric acid
Answer
$C + 4HNO_3→ CO_2 + 2H_2O + 4NO_2$
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Question 71 Mark
Give balanced equation of (a) Reduction of hot copper (II) oxide to copper using ammonia gas
Answer
$3 CuO +2 NH _3 \xrightarrow{\text { Heat }} 3 Cu + N _2+3 H _2 O$
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Question 81 Mark
Write the equation for the following : Ammonium chloride is treated with sodium hydroxide.
Answer
$NH _4 CI + NaOH \xrightarrow{\text { Heat }} NH _4 OH + NaCi$
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Question 91 Mark
Give one test that can be used to detect the presence of the ion produced in (i) and (ii).
Answer
The precipitation of metal hydroxides from their aqueous solution confirms the presence of $OH^-$ ion in the solution .
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Question 101 Mark
Name the other ion formed when ammonia dissolves in water.
Answer
When ammonia dissolves in water, the hydroxylion is also formed.
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Question 111 Mark
Write equation for the reaction of chlorine with excess of ammonia.
Answer
$8 NH _3$ (excesess) $+3 CI _2 \longrightarrow N _2+6 NH _4 CI$
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Question 121 Mark
Which compound is normally used as a drying agent for ammonia?
Answer
Quick lime (calcium oxide) is used as a drying agent for ammonia.
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Question 131 Mark
Why is ammonia not collected over water?
Answer
Ammonia is highly soluble in water and so it is not collected over water.
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Question 151 Mark
Write the equation for the formation of ammonia by the action of water on magnesium nitride.
Answer
$Mg _3 N _2+6 H _2 O \longrightarrow 3 Mg ( OH )_2+2 NH _3$
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Question 161 Mark
You enter a laboratory after a class has completed the Fountain experiment. How will you be able to tell whether the gas used in experiment was hydrogen chloride or ammonia?
Answer
By the pungent smell of ammonia gas.
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Question 171 Mark
With reference to Habers process for the preparation of ammonia, write the equation and the conditions required.
Answer
$N _2+3 H _2 \stackrel{200-900 atm _2 450-500^{\circ} C }{\rightleftharpoons} 2 NH _3+ Heat$
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Question 181 Mark
Write an equation to illustrate the reducing nature of ammonia.
Answer
$8 NH _3$ (excsess) $+3 CI _2 \longrightarrow N _2+6 NH _4 CI$
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Question 201 Mark
Write the equation for:
The preparation of ammonia from ammonium chloride and calcium hydroxide.
Answer
$2 NH _4 CI + Ca ( OH )_2 \xrightarrow{\Delta} CaCI _2+2 H _2 O +2 NH _3 \uparrow$
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Question 221 Mark
Ammonium salt decompose on heating. What other property do ammonium salts have in common?
Answer
Ammonium salts are used as fertilizers in fields.
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Question 231 Mark
State what would you observe when a piece of moist red litmus paper is placed in a gas jar of ammonia.
Answer
Dry ammonia are neutral to litmus. An aqueous solution of ammonia turns red litmus blue stating that it is basic in nature.
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Question 241 Mark
State whether each of the above reactions is an example of thermal decomposition or thermal dissociation.
Answer
Thermal dissociation.
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Question 251 Mark
What are the products formed when ammonia is oxidised with copper oxide?
Answer
$2 NH _3+3 CuO \longrightarrow 3 Cu +3 H _2 O + N _2$
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Question 261 Mark
Name the important process that starts with the reaction in (3-iv). Name the catalyst used.
Answer
This process is called as Ostwalds Process .The catalyst used is platinum.
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Question 271 Mark
When ammonium hydroxide is added to a solution B, a pale blue precipitate is formed. The pale blue precipitate dissolves in excess of ammonium hydroxide to give an inky blue solution. What is the cation (positive ion) present in solution B? What is the probable colour of solution B?
Answer
The cation is $Cu^{2+}$​​​​​​​ ion. Solution B is copper sulphate. It is bright blue in colour.
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Question 281 Mark
Write equation for the following:
Burning of ammonia in oxygen.
Answer
$4 NH _3+3 O _2 \longrightarrow 6 H _2 O +2 N _2+$ Heat
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Question 291 Mark
Write an equation for the reaction, when ammonium chloride and sodium hydroxide solution are mixed and heated.
Answer
$NH _4 CI + NaOH \xrightarrow{\Delta} NaCI + H _2 O + NH _3$
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Question 301 Mark
What do you observe when ammonia is bubbled through red litmus solution?
Answer
Ammonia forms ammonium hydroxide and turns red litmus blue as it is alkaline in nature.
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Question 311 Mark
Name the gas evolved when the mixture of calcium hydroxide and ammonium chloride is heated.
Answer
Ammonia gas
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Question 321 Mark
Complete and balance the equation: $CuO(heated) + NH_{3  \rightarrow}$
Answer
$
\underset{\text { Black }}{3 CuO }+2 NH _3 \xrightarrow{\Delta} 3 \underset{\text { Reddish brown }}{3 Cu }+3 H _2 O + N _2
$
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Question 331 Mark
Ammonia cannot be collected over water. Give reasons.
Answer
Ammonia is highly soluble gas in water and so cannot be collected over water.
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Question 351 Mark
Give balanced equation to prove that ammonia Has the element nitrogen in it.
Answer
$3 CuO +2 NH _3 \xrightarrow{\Delta} 3 Cu +3 H _2 O + N _2$
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Question 361 Mark
Give balanced equation to prove that ammonia Has the element hydrogen in it.
Answer
$8 NH _3$ (execess) $+3 CI _2 \longrightarrow N _2+6 NH _4 CI$
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Question 371 Mark
What do you observe when Ammonia comes in contact with the eyes of a person.
Answer
Ammonia affects the lachrymal glands and brings tears to the eyes.
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Question 381 Mark
What do you observe when Filter paper dipped in colourless phenolphthalein is introduced into ammonia.
Answer
The filter paper turns into deep pink suggesting that ammonia solution
is alkaline or basic in nature.
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Question 391 Mark
Give balanced reactions for the following conversion:
Copper oxide to copper.
Answer
$3 CuO +2 NH _3 \xrightarrow{\Delta} 3 Cu +3 H _2 O + N _2$
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Question 401 Mark
Give balanced reactions for the following conversion:
Ammonia to ammonium carbonate.
Answer
$2 NH _4 CI + CaCO _3 \longrightarrow\left( NH _4\right)_2 CO _3+ CaCI _2$
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Question 411 Mark
Give balanced reactions for the following conversion:
Ammonia solution to an amphoteric hydroxide.
Answer
$ NH _3+ H _2 O \rightleftharpoons NH _4 OH$
$ NH _4 OH \rightleftharpoons NH _4^{+}+ OH ^{-}$
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Question 421 Mark
Give balanced reactions for the following conversion:
Ammonia to ammonium sulphate.
Answer
$2 NH _3+ H _2 SO _4 \longrightarrow\left( NH _4\right)_2 SO _4$
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Question 431 Mark
Give balanced reactions for the following conversion:
Ammonia to nitrogen using trichloride.
Answer
$NH _3+ CI _2$ (excess) $\longrightarrow NCI _3+3 HCI$
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Question 441 Mark
Give balanced reactions for the following conversion:
Ammonia to nitrogen using oxygen.
Answer
$4 NH _3+3 O _2 \longrightarrow 2 N _2+6 H _2 O +$ Heat
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Question 451 Mark
Give balanced reactions for the following conversion:
Ammonia to nitrogen using copper oxide.
Answer
$3 CuO +2 NH _3 \xrightarrow{\Delta} 3 Cu +3 H _2 O + N _2$
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Question 461 Mark
Give balanced reactions for the following conversion:
Ammonia to nitrogen using an acidic gas.
Answer
$8 NH _3$ (excess) $+3 CI _2 \longrightarrow N _2+6 NH _4 CI$
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Question 471 Mark
Ammonia is manufactured by Haber Process.
In what ratio by volume, are the above reactants used.
Answer
The mixture of dry nitrogen and dry hydrogen is mixed in the ratio of 1:3 by volume to produce ammonia.
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Question 491 Mark
Explain the following:
Ammonia is present in sewage water.
Answer
Ammonia is formed by decaying urine and other organic matter. Thus
it is present in sewage water.
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Question 501 Mark
Write an equation for the reaction to prepare one fertilizer from ammonia.
Answer
Fertilizer from ammonia: Urea
2NH3 + CO2
Key: Ammonia is used in manufacture of fertilizer.
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[1 Mark Question Answer] - Chemistry STD 10 Questions - Vidyadip