CBSE Questions for Class 12 Engineering Chemistry The P-Block Elements Quiz 8 - MCQExams.com

Nitrogen reacts with a metal $$M$$ to produce a compound $$X$$. This compound $$X$$, when dissolved in water forms pungent gas $$Y$$ which can be identified easily by the formation of white fumes in the presence of $$HCl$$.

Identify $$Y$$.
  • Nitrogen dioxide
  • Ammonia
  • Nitrous oxide
  • Nitric oxide
$$BrF_{5}$$ is a:
  • Interhalogen compound
  • Pseudohalogen compound
  • Both the above
  • None of the above
Calcium imide on hydrolysis will give gas (B) which on oxidation by bleaching powder gives gas (C). Gas (C) on reaction with magnesium gives compound (D). (D) on hydrolysis gives again gas (B). (B), (C) and (D) respectively are :
  • $${NH_3}$$, $${N_2}$$, $${Mg_3N_2}$$
  • $${N_2}$$, $${NH_3}$$, $$Mg_3N_2$$
  • $${N_2}$$, $${N_2O_5}$$, $${Mg(NO_3)_2}$$
  • $${NH_3}$$, $${NO_2}$$, $${Mg(NO_2)_2}$$
White phosphorus on reaction with $$NaOH$$ gives $$PH_{3}$$ as one of the products. This is a :
  • dimerization reaction
  • disproportionation reaction
  • condensation reaction
  • precipitation
Which one of the following anions can undergo both oxidation and reduction?
  • $$Cr_2{O_7}^{2-}$$
  • $$N{O_3}^{-}$$
  • $$OCl^-$$
  • $${S}^{2-}$$
Which one of the following compounds on strong heating evolves ammonia gas?
  • $$(NH_{4})_{2}SO_{4}$$
  • $$NH_4NO_{3}$$
  • $$(NH_{4})_{2}Cr_{2}O_{7}$$
  • $$NH_{4}NO_{2}$$
Among the following the correct statement is :
  • Phosphates have no biological significance in humans
  • between nitrates and phosphates,phosphates are less abundant in earth's crust
  • between nitrates and phosphates,nitrates are less abundant in earth's crust
  • oxidation of nitrates is possible in soil
The weakest $$Cl-O$$ bond is found in :
  • $$ClO_{4}^{-}$$
  • $$ClO_{2}^{-}$$
  • $$ClO^{-}$$
  • $$ClO_{3}^{-}$$
Which of the following when dissolved in water will liberate ammonia ?
  • $${Na NO_3}$$
  • $${Na NO_2}$$
  • $${Na NH_2}$$
  • $${Na_3N}$$
Ammonia can be dried by:
  • conc. $$\displaystyle H_{2}SO_{4}$$
  • $$\displaystyle P_{4}O_{10}$$
  • $$CaO$$
  • anhydrous $$\displaystyle CaCl_{2}$$
In the isolation of fluorine a number of difficulties were encountered.Which statements are incorrect :
  • Fluorine reacts with moist glass vessels
  • Fluorine has great affinity for hydrogen
  • Electrolysis of aqueous HF gives ozonized oxygen
  • The potential required for the discharge of the fluoride ions lowest
Which is the strongest oxidising agent out of the following?
  • $$\displaystyle { I }_{ 2 }$$
  • $$\displaystyle { Cl }_{ 2 }$$
  • $$\displaystyle { Br }_{ 2 }$$
  • $$\displaystyle { F }_{ 2 }$$
Inter- halogen compounds can be :
  • $$ ICl_3 $$
  • $$ BrF_5 $$
  • $$ IF_7 $$
  • all of these
The interhalogen compound not obtained is :
  • $$ ICl $$
  • $$IF_5 $$
  • $$ BrF_5 $$
  • $$ BrCl_7 $$
Which of the following statement(s) is/are correct for Halogens.
  • A halogen which is liquid at room temperature is bromine
  • The most electro-negative element is fluorine
  • The most reactive halogen is fluorine
  • The strongest oxidizing agent iodine
Assuming that the seventh period is $$32$$ members long, what should be the atomic number of the noble gas following radon $$(Rn)$$? 
  • $$120$$
  • $$118$$
  • $$116$$
  • $$122$$
The $$(IE)_1$$ and the $$(IE)_2$$ in kJ mol$$^{-1}$$ of a few elements designated by Roman numerals are shown below

 Element  $$(IE)_1$$$$(IE)_2$$ 
 A 2372  5251
 B 520  7300
 C 900  1760
 D 1680  3380
 Based on above information, Which represents a noble gas ?
  • $$A$$
  • $$B$$
  • $$C$$
  • $$D$$
The greater reactivity of $$\displaystyle { F }_{ 2 }$$ is due to :
  • lower electron affinity of F.
  • lower bond energy of $$\displaystyle { F-F }$$ bond.
  • higher electronegativity of F.
  • gaseous state of $$\displaystyle { F }_{ 2 }$$.
$$NH_3$$ can't be obtained by :
  • heating of $$NH_4NO_3$$ or $$NH_4NO_2$$
  • heating $$NH_3CI$$ or $$(NH_4)_2CO_3$$
  • heating of $$NH_4NO_3$$ with $$NaOH$$
  • reaction of $$AIN$$ or $$Mg_3N_2$$ or $$CaCN_2$$ with $$H_2O$$
Major minerals containing nitrogen are:
  • $$DNA$$
  • $$RNA$$
  • $$KNO_3, NaNO_3$$
  • all of these
Nitrogen differs from P, As, Sb and Bi in the following properties :
  • It forms diatomic molecule.
  • It is not able to extent its coordination number beyond four.
  • Nitrogen does not function as a Lewis acid whereas P, As, Sb and Bi do so.
  • In all the properties given above.
Calcium cyanamide on treatment with steam produces :
  • $$NH_3+CaO$$
  • $$NH_3+CaHCO$$
  • $$NH_3+CaCO_3$$
  • $$NH_3+Ca(OH)_2$$
$$NH_4CI(s)$$ is heated in a test tube, vapours are brought in contact with red litmus paper, which changes to blue and then to red. it is because of : 
  • formation of $$NH_4OH$$ and $$HCI$$
  • formation of $$NH_3$$ and $$HCI$$
  • greater diffusion of $$NH_3$$ than $$HCI$$
  • grater diffusion of $$HCI$$ than $$NH_3$$
$$Fe^{2+}$$ reduces $$NH_2OH$$ to : 
  • $$NH_3$$
  • $$N_3H$$
  • $$N_2H_4$$
  • $$N_2$$
For inert gases, $$\displaystyle \frac{C_p}{C_v}= $$ _____ .
  • 1.33
  • 1.40
  • 1.66
  • can't be predicted
The gas not absorbed by coconut charcoal is :
  • He
  • Ne
  • Ar
  • Kr
Hydrates of helium and neon have not been prepared because of :
  • low polarisability
  • small size
  • low boiling point
  • all of the above
$$NH_4Cl, NH_4NO_3$$ and $$(NH_4)_2CO_3$$ gives  $$NH_3$$ gas on heating.
  • True
  • False
What were the reasons for late discovery of noble gases?
  • Chemical inertness of lighter noble gases, $$i.e$$., He, Ne and Ar.
  • Rare abundance of comparatively reactive noble gases, $$i.e$$., Kr, Xe and Rn.
  • They were not found in the nature very early, so could not be found.
  • None of the above.
Which of the following are coloured and paramagnetic both ?
$$NO_2, Cu^+, O_2, O_3, Hg^{2+}_2, Cd^{2+}, Al, C(graphite)$$ 
  • $$ NO_2$$
  • $$ NO_2$$ , $$ O_3$$
  • $$ Hg^{2+}_2 $$
  • $$ NO_2$$, $$Cu^+$$
Consider the following properties of the noble gases:
$$I$$:      they readily from compounds which are colourless.
$$II$$ :   they generally do not form ionic compounds.
$$III$$ : they have variable oxidation states in their compounds.
$$IV$$ :  they generally do not form covalent compounds.

Select the the correct properties.
  • $$I, II$$ and $$III$$ only
  • $$ II$$ and $$III$$ only
  • $$I$$ and $$III$$ only
  • $$I$$ only
High reactivity of white phosphorus is due to : 
  • unusual bonding that produces considerable strain
  • high solubility in water
  • oxide layer made on it
  • all of the above
In $$P_4$$ (tetrahedral) :
  • each P is joined to four P
  • each P is joined to three P
  • each P is joined to two P
  • $$P_4$$ does not exist
The valance electron present in group 17 elements is:
  • 1
  • 2
  • 6
  • 7
Which of the following phosphorus is the most reactive ?
  • Red Phosphorus
  • White Phosphorus
  • Scarlet Phosphorus
  • None of the above
Aluminium nitride and water
  • $$ 4AlN+{ 3H }_{ 2 }O\rightarrow 4Al\left( OH \right) _{ 3 }+4{ NH }_{ 3 }$$
  • $$ AlN+{ 4H }_{ 2 }O\rightarrow Al\left( OH \right) _{ 3 }+2{ NH }_{ 3 }$$
  • $$ AlN+{ 3H }_{ 2 }O\rightarrow Al\left( OH \right) _{ 3 }+{ NH }_{ 3 }$$
  • $$ 2AlN+{ 3H }_{ 2 }O\rightarrow 2Al\left( OH \right) _{ 3 }+2{ NH }_{ 3 }$$
Write the balanced equation for the preparation of $$NH_3$$ from ammonium chloride and calcium hydroxide.
  • $${ 4NH }_{ 4 }Cl+Ca\left( OH \right) _{ 2 }\rightarrow 2{ NH }_{ 3 }+2{ CaCl }_{ 2 }+{ 2H }_{ 2 }O$$
  • $${ 2NH }_{ 4 }Cl+2Ca\left( OH \right) _{ 2 }\rightarrow 2{ NH }_{ 3 }+2{ CaCl }_{ 2 }+{ 2H }_{ 2 }O$$
  • $${ 2NH }_{ 4 }Cl+Ca\left( OH \right) _{ 2 }\rightarrow 2{ NH }_{ 3 }+{ CaCl }_{ 2 }+{ 2H }_{ 2 }O$$
  • $${ NH }_{ 4 }Cl+Ca\left( OH \right) _{ 2 }\rightarrow { NH }_{ 3 }+{ CaCl }_{ 2 }+{ 2H }_{ 2 }O$$
In the manufacture of ammonia, what is the ratio of the reactants taken, i.e. $$N_2 {:}H_2$$?
  • $$1:1$$
  • $$1:3$$
  • $$3:1$$
  • $$2:3$$
How is ammonia collected?
  • Ammonia is less dense than air so it is collected by upward delivery.
  • Ammonia is more dense than air so it is collected by upward delivery.
  • Ammonia is more dense than air so it is collected by downward delivery.
  • None of the above.
Warming ammonium sulphate with sodium hydroxide solution gives :
  • ammonia
  • chlorine
  • nitrogen
  • none of these
Heating ammonium chloride with sodium hydroxide produces :
  • ammonia
  • nitrogen
  • chlorine
  • none of these
Which of the following balanced equation correctly represents the formation of ammonia using Haber's process?
  • $${ N }_{ 2 }+{ H }_{ 2 }\rightarrow 2{ NH }_{ 3 }$$
  • $${ N }_{ 2 }+{ 3H }_{ 2 }\rightarrow { NH }_{ 3 }$$
  • $${ N }_{ 2 }+{ 3H }_{ 2 }\rightarrow 2{ NH }_{ 3 }$$
  • $$2{ N }_{ 2 }+{ 3H }_{ 2 }\rightarrow 4{ NH }_{ 3 }$$
Which of the following is a tetratomic element?
  • Phosphorus
  • Iron
  • Calcium
  • None of the above
Industrially, ammonia is obtained by direct combination between nitrogen and hydrogen. The formation of ammonia is promoted at:
  • 1000 atm
  • 200 atm
  • 25 atm
  • 1 atm
With reference to Haber's process, the required catalyst used is :
  • iron oxide
  • aluminium oxide
  • magnesium oxide
  • all of the above
The characteristic of the last elements in the periods of a periodic table:
  • orbital completely
  • zero electron affinity
  • zero tendency in accepting electrons
  • All of these
An alkaline gas, which produces dense white fumes when reacted with HCl gas is________.
  • ammonia
  • chlorine
  • nitrogen
  • oxygen
In the manufacture of ammonia, the catalyst used is :
  • magnesium oxide
  • silver
  • gold
  • nickel
Equation for the following reaction.
$$Cu+{ xHNO }_{ 3 }\rightarrow Cu\left( { NO }_{ 3 } \right) _{ 2 }+{ 2H }_{ 2 }O+{ 2NO }_{ y }$$
Find the value of $$x$$ and $$y$$.
  • $$x=4, y= 2$$
  • $$x=1, y= 2$$
  • $$x=2, y= 2$$
  • $$x=4,, y= 1$$
Give the balanced reaction for the manufacture of the ammonia gas.
  • $$3{ N }_{ 2 }+3{ H }_{ 2 }\rightarrow 6{ NH }_{ 3 }$$
  • $${ N }_{ 2 }+3{ H }_{ 2 }\rightarrow 2{ NH }_{ 3 }$$
  • $${ N }_{ 2 }+3{ H }_{ 2 }\rightarrow { NH }_{ 3 }$$
  • $${ N }_{ 2 }+6{ H }_{ 2 }\rightarrow 4{ NH }_{ 3 }$$
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