CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 6 - MCQExams.com

Nitric acid is manufactured by the Ostwald process, in which nitrogen oxide reacts with water. $$3NO_3(g)+H_2O(l) \rightarrow 2HNO_3(aq)+NO(g)$$How many grams of nitrogen dioxide are required in this reaction to produce 25.2 g of $$HNO_3$$?
  • 21.6 g
  • 27.6 g
  • 46.8 g
  • 16.0 g
In Ostwald's process for the manufacture of nitric acid, the first step involves the oxidation of ammonia gas by oxygen gas to give nitric oxide gas and steam. What is the maximum weight of nitric oxide that can obtained starting only with 10.00g of ammonia and 20.00g of oxygen?
  • 15 g
  • 10 g
  • 2 g
  • 20 g
When we inhale helium gas funny sound appear which is due to:
  • high density of helium than air
  • low density of air than helium
  • low density of helium than air
  • reaction between air and helium
Ammonia is produced when a mixture of ammonium chloride and substance X is heated. What is substance X?
  • Ammonium sulphate
  • Barium chloride
  • Calcium hydroxide
  • Silver nitrate
Large scale manufacturing of nitric acid by the Ostwald process utilizes the reaction-
  • $$2NaNO_3+H_2SO_4 \rightarrow Na_2SO_4 + 2HNO_3$$
  • $$4NH_3+5O_2 \rightarrow 4NO+6H_2O$$
  • $$NO^{+}_{2}+NO^−_3 + H_2O \rightarrow 2HNO_3$$
  • $$2NO+O_2+H_2O \rightarrow HNO_3+HNO_2$$
The correct statement among the following is: 
  • $$(SiH_3)_3 N$$ is pyramidal and more basic than $$(CH_3)_3 N$$
  • $$(SiH_3)_3 N$$ is planar and more basic than $$(CH_3)_3N$$
  • $$(SiH_3)_3 N$$ is pyramidal and less basic than $$(CH_3)_3 N$$
  • $$(SiH_3)_3 N$$ is planar and less basic than $$(CH_3)_3 N$$
White phosphorus has:
  • Six $$P-P$$ single bonds
  • Four $$P-P$$ single bonds
  • Four lone pairs of electrons
  • $$P-P-P$$ angle of $$60^{\circ}$$
In the preparation of $$HNO_3$$ by Ostwald process ammonia is: 
  • Oxidized
  • Reduced
  • Neither oxidized nor reduced
  • Both oxidized and reduced
Nitric Acid is manufactured by:
  • Ostwald's Process
  • Haber's Process
  • Contact Process
  • None of these
In ostwald process of manufacturing of $$HNO_3$$ , catalyst used is
  • Mo
  • Fe
  • Pt
  • Na
In white phosphorous $$(P_4)$$ molecule which one is not correct?
  • Six $$P-P$$ single bonds are present
  • Four $$P-P$$ single bonds are present
  • Four lone pairs of electron are present
  • $$P\ P\ P$$ bond angle is $$60^o$$
Oxygen can be obtained from bleaching powder by:
  • adding dilute acid
  • passing carbon dioxide
  • heating with a cobalt salt
  • adding alkalies
White phosphorous has :
  • six $$P-P$$ single bonds
  • four $$P-P$$ single bonds
  • four lone pairs of electrons
  • $$P\ P\ P$$ angle of $$60^o$$
The catalyst used in the manufacture of $$NO$$ by Ostwald's process is:
  • $$Pt$$
  • $$Fe$$
  • $$Mo$$
  • $$Cu$$
The electron affinity values $$(kJmol^{−1})$$ of three halogens X, Y, and Z respectively are −349, −333, and −Then X, Y, and Z respectively are :
  • $$ F_2 , CI_2, \ and\ Br_2 $$
  • $$ CI_2, F_2 \ and \ Br_2 $$
  • $$ CI_2, Br_2,\ and\  F_2 $$
  • $$ Br_2, CI_2, \ and \ F_2 $$
______ is the by-product obtained in the Serpek's process.
  • Oxygen
  • Ammonia
  • Nitrogen dioxide
  • Nitric oxide
Which one of the following is not used for the manufacture of ammonia?
  • Haber process
  • Cyanamide process
  • Ammonia mother liquor
  • Solvay ammonia process
Which one of the compound is not known?
  • $$NCl_5$$
  • $$PCl_5$$
  • $$AsCl_5$$
  • $$NCl_3$$
Which of the following exhibits the weakest intermolecular forces?
  • $$\mathrm{H}_{2}\mathrm{O}$$
  • $$ \mathrm{N}\mathrm{H}_{3}$$
  • He
  • HCl
The solubility of noble gases in water shows the order :
  • $$ He > Ar > Kr > Ne > Xe $$
  • $$ He > Ne > Ar > Kr > Xe $$
  • $$ Xe > Kr > Ar > Ne > He $$
  • $$ Xe > Ar > Ne > Kr > He $$
What is the atomic number (Z) of the noble gas that reacts with fluorine?
  • 54
  • 10
  • 18
  • 2
Which of the following has the highest density?
  • $$Ne$$
  • $$Ar$$
  • $$He$$
  • $$Xe$$
Assertion (A): Solubility of noble gases in water decreases with increase in atomic size.
Reason (R): Solubility is due to dipole-induced dipole interaction.
  • Both $$A$$ and $$R$$ are correct and $$R$$ is the correct explanation of $$A$$.
  • Both $$A$$ and $$R$$ are correct and $$R$$ is not the correct explanation of $$A$$.
  • $$A$$ is true but $$R$$ is false.
  • $$A$$ is false but $$R$$ is true.
Statement - I: He -II has high viscosity and flows downward.
Statement - II: Liquid helium is used as cryogenic liquid.
  • Both I and II are true. II is correct

    explanation of I.
  • Both I and II are true. II is not correct

    explanation of I.
  • I is true but II is false
  • I is false but II is true.
In clathrate atoms or molecules the bond formed is :
  • Metallic
  • Covalent
  • Ionic
  • They do not form bond
Which of the following is a superfluid?
  • Krypton
  • Argon II
  • Helium II
  • Helium I
Total number of covalent bonds in a white phosphorous molecule is:
  • 1
  • 4
  • 3
  • 6
The anomalous behaviour of nitrogen is due to:
  • small size and high electronegativity
  • non availability of d-orbitals in valency shell
  • ease of multiple bond formation
  • all are correct
 Hydrolysis of $$\mathrm{M}\mathrm{g}_{3}\mathrm{N}_{2}$$ gives :
  • $$ \mathrm{N}\mathrm{H}_{3}$$
  • $$\mathrm{N}\mathrm{O}$$
  • $$\mathrm{H}_{2}$$
  • $$\mathrm{C}\mathrm{O}_{2}$$
Clathrates are_________
  • Inert gases
  • Inert gases $$+$$ organic or inorganic compounds
  • Halogen $$+$$ carbon black
  • Halogen $$+$$ transition elements
 Which compound does not give ammonia gas on reaction with water ?
  • $$ \mathrm{M}\mathrm{g}_{3}\mathrm{N}_{2}$$
  • $$ \mathrm{A}\mathrm{l}\mathrm{N}$$
  • $$\mathrm{C}\mathrm{a}\mathrm{C}\mathrm{N}_{2}$$
  • $$\mathrm{C}\mathrm{a}(\mathrm{C}\mathrm{N})_{2}$$
The most abundant element in the earth's crust among the following is_________.
  • $$\mathrm{P}$$
  • $$\mathrm{A}\mathrm{s}$$
  • $$\mathrm{S}\mathrm{b}$$
  • $$\mathrm{B}\mathrm{i}$$
Assertion (A): In the synthesis of ammonia by Haber's process, mixture of potassium and aluminium oxides can be used as promoter.
Reason (R): Promoter enhances the activity of catalyst.
  • Both (A) and (R) are true and (R) is the correct explanation of (A)
  • Both (A) and (R) are true and (R) is not the correct explanation of (A)
  • (A) is true and (R) is false
  • (A) is false but (R) is true
Gas obtained by heating a mixture of ammonium chloride and slaked lime is:
  • $$\mathrm{N}\mathrm{H}_{3}$$
  • $$\mathrm{N}_{2}$$
  • $$\mathrm{N}_{2}\mathrm{O}$$
  • $$\mathrm{N}\mathrm{O}_{2}$$
One mole of magnesium nitride on the reaction with an excess of water gives : 
  • one mole of ammonia
  • one mole of nitric acid
  • two moles of ammonia
  • two moles of nitric acid
Hydrolysis of $$\mathrm{N}\mathrm{Cl}_{3}$$ gives $$\mathrm{N}\mathrm{H}_{3}$$ and $$\mathrm{X}$$. Which of the following is X?
  • $$ \mathrm{H}\mathrm{Cl}\mathrm{O}_{4}$$
  • $$ \mathrm{H}\mathrm{Cl}\mathrm{O}_{3}$$
  • $$ \mathrm{HO}\mathrm{Cl}$$
  • $$\mathrm{H}\mathrm{Cl}\mathrm{O}_{2}$$
Ammonia is not a product in the :
  • hydrolysis of nitrolim
  • hydrolysis of aluminium nitride
  • decomposition of ammonium nitrite
  • hydrolysis of urea
Assertion (A): A mixture of $$CaCN_2$$ and graphite is known as nitration mixture.
Reason (R) : $$NH_3$$ is collected by downward displacement of air.
  • Both (A) and (R) are true and (R) is the correct explanation of (A)
  • Both (A) and (R) are true and (R) is not the correct explanation of (A)
  • (A) is true and (R) is false
  • (A) is false but (R) is true
Nitrogen form $$N_2$$ but phosphorous when forms $$P_2$$ gets readily converted into $$P_4$$ because : -
  • Triple bond present between phosphorous atom
  • $$p_\pi- p_\pi$$bonding is weak
  • $$p_\pi- p_\pi$$bonding is strong
  • Multiple bond form easilly
A metal X on heating in nitrogen gas gives Y. Y on treatment with $$H_2O$$ gives a colourless gas which when passed through $$CuSO_4$$ solution gives a blue colour. Y is :
  • $$\mathrm{Mg(N}\mathrm{O}_{3})_{2}$$
  • $$\mathrm{M}\mathrm{g}_{3}\mathrm{N}_{2}$$
  • $$\mathrm{N}\mathrm{H}_{3}$$
  • $$\mathrm{M}\mathrm{g}\mathrm{O}$$

Ammonia gas is prepared by :
  • reduction of sodium nitrite or sodium nitrate by the reaction with zinc dust and sodium hydroxide.
  • hydrolysis of calcium cyanamide.
  • heating of $$\left ( NH_{4} \right )_{2}Cr_{2}O_{7}$$
  • heating ammonium chloride with slaked lime.
White phosphorus $$P_{4}$$ has:
  • six $$P-P$$ single bonds
  • four $$P-P$$ single bonds
  • four lone pairs of electrons
  • $$P-P-P$$ angle of 60 degerees
The ease of liquefaction of noble gases increases in the order
  • Ar > Kr > Xe > Ne > He
  • Xe > Kr > Ne > Ar > He
  • Kr > Xe > He > Ne > Ar
  • He > Ne > Ar > Kr > Xe
Ammonia gas is prepared by :
  • reduction of sodium nitrite or sodium nitrate by the reaction with zinc dust and sodium hydroxide.
  • hydrolysis of calcium cyanamide.
  • heating of $$(NH_{4})_{2}Cr_{2}O_{7}$$
  • heating ammonium chloride with slaked lime.
The following acids have been arranged in order of decreasing acid strength. Identify the correct order.
$$ClOH (I),\ BrOH (II),\ IOH (III)$$
  • $$I>II>III$$
  • $$II>I>III$$
  • $$III>II>I$$
  • $$I>III>II$$
Which of the following statements is/are incorrect ?
  • In $$B_2H_6(s)$$ there are four $$2c-2e^-$$ bonds
  • In $$(SiH_3)_3 \ddot {P}$$ there is back bonding
  • $$(CH_3)_3\ddot{N}$$ and $$(SiH_3)_3\ddot{N}$$ are pyramidal
  • $$Al_2Cl_6(s)$$ has banana bonding
When $$MnO_{2}$$ is added to $$KClO_{3}$$ in the preparation of oxygen the decomposition temperature of $$KClO_{3}$$ is reduced from $$350^{o}C$$ to ......
  • $$300^{o}C$$
  • $$150^{o}C$$
  • $$250^{o}C$$
  • room temperature
In which of the following reactions, $$O_{2}$$ is not formed as one of the product?
  • $$KClO_{3}\xrightarrow [ Heat ]{ MnO_{2} } $$
  • $$SnCl_{2}+HCl+O_{3}\rightarrow$$
  • $$FeSO_{4}+H_{2}SO_{4}+O_{3}\rightarrow$$
  • $$PbS+O_{3}\rightarrow$$
Consider the following reaction,
$$NO_2 +NaOH \to (A)+(B)+H_2O$$
which of the following is correct?
  • both $$(A)$$ and $$(B)$$ on heating with $$Na$$ from $$N_2$$
  • both $$(A)$$ and $$(B)$$ on treatment with$$Zn$$ and $$NaOH$$ produce $$NH_3$$
  • both are correct
  • none is correct
What is formed xenon combines with fluorine in the pressure of mercury vapour?
  • $$XeF$$
  • $$Xe_2F$$
  • $$XeF_2$$
  • $$XeF_4$$
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 12 Engineering Chemistry Quiz Questions and Answers