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Chemistry [1 Mark Question Answer]

9.2 Nitric Acid · ICSE STD 10 (ICSE - English Medium). 63 questions.

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Question 11 Mark
Write a balanced equation for following :
Laboratory preparation nitric acid.
Answer
$KNO _3+ H _2 SO _4 \xrightarrow{>200^{\circ} C } KHSO _4+ HNO _3$
OR
$NaNO _3+ H _2 SO _4 \xrightarrow{<200^{\circ} C } NaHSO _4+ HNO _3$
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Question 21 Mark
Write a balanced equation for following :
Reaction of ammonia with nitric acid
Answer
$NH _3+ HNO _3 \longrightarrow NH _4 NO _3$
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Question 31 Mark
Write a balanced equation for following :
Action of conc. Nitric acid on sulphur
Answer
$S +6 HNO _3 \longrightarrow H _2 SO _4+2 H _2 O +6 NO _2$
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Question 41 Mark
Write a balanced equation for following :
Action of cold and dilute nitric acid on copper
Answer
$3Cu + 8HNO_{3 }\rightarrow 3Cu(NO_3)_2 + 4H_2O+ 2NO↑$
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Question 51 Mark
Balanced equation of oxidation of carbon with concentrated $HNO_3$
Answer
$C +$ Conc $\cdot 4 HNO _3 \longrightarrow CO _2+2 H _2 O +4 NO _2$
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Question 61 Mark
Identify the gas evolved when sulphur is treated with concentrated $NH_3$.
Answer
When sulphur is treated with conc. nitric acid, it produces nitrogen dioxide.
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Question 71 Mark
What would you observe in the following case:
Copper is heated with concentrated nitric acid in a hard glass test tube.
Answer
Brown fumes of nitrogen dioxide are produced. Copper reacts with concentrated nitric acid to produce copper nitrate, water and nitrogen dioxide.
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Question 81 Mark
What is the special feature of the apparatus that is used in the laboratory preparation of nitric acid?
Answer
The complete apparatus should be made of glass only.
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Question 91 Mark
Name the gas evolved:
The gas produced on heating sodium nitrate.
Answer
Oxygen gas is evolved on heating sodium nitrate.
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Question 101 Mark
Write the equation for the reaction :
Aluminium Nitride and water.
Answer
$AlN +3 H _2 O \longrightarrow Al ( OH )_3+ NH _3$
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Question 111 Mark
State, what is observe when nitric acid is kept in a reagent bottle for a long time.
Answer
If nitric acid is kept in a bottle for long time then it will become brown in colour.
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Question 121 Mark
Write a chemical equation to illustrate the acidic nature of nitric acid.
Answer
Nitric acid ionizes in water to form free hydronium ions and nitrate ions. This shows that nitric acid is aidic in nature.
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Question 131 Mark
Explain, why only all glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.
Answer
Nitric acid is highly corrosive in nature and corrodes cork, rubber, etc.
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Question 141 Mark
Write the equation for the reaction of dilute nitric acid with copper.
Answer
$Cu +4 HNO _3 \xrightarrow{\Delta} Cu \left( NO _3\right)_2+2 NO _2+2 H _2 O$
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Question 151 Mark
Write balanced equation to show the reaction between the sulphur and hot concentrated nitric acid.
Answer
$S +6 HNO _3 \longrightarrow H _2 SO _4+2 H _2 O +6 NO _2$
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Question 161 Mark
Write the equation for the laboratory preparation of nitric acid from potassium nitrate and concentrated sulphuric acid.
Answer
$KNO _3+ H _2 SO _4 \xrightarrow{200^{\circ} C } KHSO _4+ HNO _3$
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Question 171 Mark
When nitric acid is prepared by the action of concentrated sulphuric acid on potassium nitrate. what is the special feature of the apparatus used?
Answer
The apparatus used is made up of glass as nitric acid is highly corrosive in nature.
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Question 181 Mark
The first step in the manufacture of nitric acid is the catalytic oxidation of ammonia. What is the name of the catalyst?
Answer
Platinum gauze is used as catalyst in the manufacture of nitric acid.
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Question 191 Mark
Write equation to show the reaction between the following:
Copper oxide and dilute nitric acid.
Answer
$CuO +2 HNO _3 \longrightarrow Cu \left( NO _3\right)_2+ H _2 O$
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Question 201 Mark
Write equation to show the reaction between the following:
Copper and concentrated nitric acid.

Answer
$Cu +4 HNO _3 \xrightarrow{\Delta} Cu \left( NO _3\right)_2+2 NO _2+2 H _2 O$
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Question 211 Mark
Describe what you see when concentrated nitric acid is added to copper.
Answer
When concentrated nitric acid is added to copper brown fumes of nitrogen dioxide are observed.
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Question 221 Mark
Write balanced equation for the reaction between nitrogen and oxygen, when lightning strikes.
Answer
$N _2+ O _2 \xrightarrow{\text { lightning }} 2 NO$
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Question 231 Mark
Write the balanced equation for the equation preparation of nitric acid from potassium nitrate.
Answer
$KNO _3+ H _2 SO _4 \xrightarrow{200^{\circ} C } KHSO _4+ HNO _3$
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Question 241 Mark
Write a balanced equation for the production of nitrogen dioxide using copper.
Answer
$Cu +4 HNO _3 \xrightarrow{\Delta} Cu \left( NO _3\right)_2+2 NO _2+2 H _2 O$
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Question 251 Mark
State the conditions for the oxidation of ammonia to nitrogen monoxide [nitric oxide], in the manufacture of nitric acid by Ostwalds process. Write the balanced equcation for the reaction.
Answer
Oxidation of ammonia in catalytic chamber.
$4 NH _3+5 O _2 \xrightarrow[800^{\circ} C ]{\text { platinum gangue }} 4 NO +6 H _2 O +$ Heat
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Question 261 Mark
Write the equation to show the reaction between the following:
Between copper and concentrated nitric acid.
Answer
$Cu +4 HNO _3 \xrightarrow{\Delta} Cu \left( NO _3\right)_2+2 NO _2+2 H _2 O$
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Question 271 Mark
Write the equation to show the reaction between the following:
Dilute nitric acid to produce carbon dioxide.
Answer
$Na _2 CO +2 HNO _3 \longrightarrow 2 NaNO _3+ H _2 O + CO _2$
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Question 281 Mark
Write the equation of the following reaction.
Sulphur can be converted to sulphuric acid using concentrated nitric acid.
Answer
$S +6 HNO _3 \longrightarrow H _2 SO _4+2 H _2 O +6 NO _2$
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Question 291 Mark
Name (formula is not acceptable) the gas produced in the following reaction:
On warming ammonium sulphate with sodium hydroxide solution.
Answer
Ammonia gas
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Question 301 Mark
Name (formula is not acceptable) the gas produced in the following reaction:
By the action of concentrated nitric acid on copper.
Answer
Nitrogen dioxide
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Question 311 Mark
What do you see when concentrated nitric acid is added to copper?
Answer
When concentrated nitric acid is added to copper brown fumes of nitrogen dioxide are observed.
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Question 321 Mark
Complete and balance the following equation:
$Cu + HNO_3 \rightarrow NO_2$_ + ________+ _________
Answer
$Cu + 4HNO_3 \rightarrow Cu(NO_3)_2 + 2NO_2 + 2H_2O$
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Question 331 Mark
Write balanced equation for the preparation of nitric acid from potassium nitrate.
Answer
$KNO _3+ H _2 SO _4 \xrightarrow{200^{-}} KHSO _4+ HNO _3$
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Question 341 Mark
Complete and balance the following equation :
$HNO_3 + FeSO_4 + H_2SO_4\rightarrow$ ______________
Answer
$2 HNO _3+6 FeSO _4+3 H _2 SO _4 \longrightarrow 3 Fe _2\left( SO _4\right)_3+2 NO + H _2 O$
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Question 351 Mark
Complete and balance the following equation :
$Pt + HNO_3 + HCl \rightarrow$ ___________
Answer
$Pt + HNO _3+ HCl \longrightarrow PtCl _4$
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Question 361 Mark
Complete and balance the following equation :
$FeSO_4 + NO + H_2O \rightarrow$ ______________
Answer
$FeSO _4+ NO +5 H _2 O \longrightarrow\left[ Fe ( NO )\left( H _2 O \right)_5\right] SO _4$
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Question 371 Mark
Complete and balance the following equation :
$Fe + HNO_3(conc.) \rightarrow$ _____________
Answer
$3 Fe +8 HNO _3$ (conc $\left.\cdot\right) \longrightarrow 3 Fe ( NO )_3+4 H _2 O +2 NO$
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Question 381 Mark
Complete and balance the following equation :
$SO_2 + HNO_3 \rightarrow$ ______________
Answer
$3 SO _2+2 HNO _3+2 H _2 O \longrightarrow 3 H _2 SO _4+2 NO$
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Question 391 Mark
Complete and balance the following equation :
$C + HNO_3 \rightarrow$ ___________
Answer
$C +4 HNO _3 \longrightarrow 2 H _2 O +4 NO _2+ CO _2$
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Question 401 Mark
Give reason for the following:
Concentrated nitric acid is brown in colour.
Answer
Concentrated nitric acid is brown in colour due to the presence of nitrogen dioxide formed by heating the acid.
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Question 411 Mark
Give reason for the following:
Lighting is a blessing in disguise.
Answer
Lightning is a blessing as it is the natural source of synthesis of nitric acid.
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Question 421 Mark
Give reason for the following:
Nitric acid is used in purification of gold.
Answer
Nitric acid is used in the purification of gold because impurities of other metals are dissolved in it.
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Question 431 Mark
What is the oxidizing agent in ostwald process ?
Answer
Oxygen is the Oxidizing agent which converts ammonia to nitric acid.
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Question 451 Mark
In which ratio reactants are taken in Ostwald process?
Answer
In ostwald process ammonia gas and air are taken in 1:10 ratio.
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Question 461 Mark
What are the reactants required for Ostwald process and what are their sources?
Answer
Reactants required for Ostwald process are ammonia and oxygen of air.
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Question 471 Mark
Name the process used for the manufacture of nitric acid.
Answer
Ostwald process is used for the manufacture of nitric acid.
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Question 481 Mark
What happen when (Given balanced equation):
Limestone reacts with nitric acid?
Answer
When limestone reacts with nitric acid-$CaCO _3+2 HNO _3 \longrightarrow Ca \left( NO _3\right)_2+ H _2 O ( I )+ CO _2$
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Question 491 Mark
What happen when (Given balanced equation) :
Nitric acid is dissolved in large amount of water?
Answer
Nitric acid ionizes in water to form free hydronium ions and nitrate ions.$HNO _3+ H _2 O \rightleftharpoons H _3 O ^{+}+ NO _3^{-}$
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Question 501 Mark
What happens when (Given balanced equation) :
Sulphar is added to hot and conc. $HNO_3$?
Answer
When sulphur is added to hot and conc. $HNO _3$ formation of oxide or oxy-acid will occur.
$
S +6 HNO _3 \longrightarrow H _2 SO _4+2 H _2 O +6 NO _2
$
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