JEE Main Chemistry - Chemistry of s and p Block Elements
Exam Duration: 60 Mins Total Questions : 30
The thermal stability of terachlorides of 14 th group follow the order
- (a)
PbCl3>SnCl4>GeCl4>SiCl4>CCl4
- (b)
CCl4>SiCl4>GeCl4>SnCl4>PbCl4
- (c)
GeCl4>SiCl4>CCl4>SnCl4>PbCl4
- (d)
None of the above
NO2 is evolved when
- (a)
NH4NO3 is heated
- (b)
HNO3+P2O5 is heated
- (c)
2NO+N2O4 is heated
- (d)
Pb(NO3)2 is heated
The thermal stability of hydrides of oxygen family follow the order
- (a)
H2O>H2s>H2se>H2Te
- (b)
H2Te>H2Se>H2S>H2O
- (c)
H2S>H2O>H2Se>H2Te
- (d)
None of the above
Which one of the following cannot be used as catalyst in fridal craft reaction
- (a)
BF3
- (b)
AlCl3
- (c)
SnCl4
- (d)
(C2H5)3N
There is on ozone layer at a height of about 29KM above the surface of the earth.Which of the following statement is correct?
- (a)
It is harmful because ozone is dangerous to living organisms
- (b)
It is beneficial because oxidation reaction can proceed faster in the presence of zone
- (c)
It is beneficial because ozone cuts out the ultraviolet radiation of the sun
- (d)
It is harmful because ozone cuts out the important radiations of the sun which are vital for photosynthesis.
If 20% nitrogen is present in a compound, its minimum molecular weight can be
- (a)
144
- (b)
70
- (c)
100
- (d)
141
Point out the property which is common in white phosphorus and red
- (a)
it is soluble in carbon disulphide
- (b)
it shows chemiluminescence
- (c)
it reacts with hot caustic soda solution to give phosphine
- (d)
it burns when heated in air
Oxide of a non-metal possess the following characteristics
(i)it is both a proton donor and proton acceptor.
(ii)it is poor conductor of electricity.
(iii)it reacts readily with basic and acidic oxides
(iv)it oxidises Fe at boiling point
The oxides
- (a)
H2O
- (b)
CO2
- (c)
H2O2
- (d)
NO2
The van der Waal's forces in halogen decrease in the order
- (a)
F2 > Cl2 > Br2 > I2
- (b)
I2 > Br2 > Cl2 > F2
- (c)
Br2 > Cl2 > F2 > I2
- (d)
Cl2 > Br2 > I2 > F2
Affinity for hydrogen decreases in the group from fluorine to iodine.Which of the halogen acids should have highest bond dissociation enthalpy?
- (a)
HF
- (b)
HCl
- (c)
HBr
- (d)
HI
Which compound is prepared by the following reaction?
\(Xe+2F_{ 2 }\xrightarrow[673k,5-6atm]{Nickel\ vessel}\)
- (a)
XeF2
- (b)
XeF6
- (c)
XeF4
- (d)
XeOF
The metal used in flash bulbs is
- (a)
Ca
- (b)
Be
- (c)
Mg
- (d)
Ba
The number of electrons present in the valence shell of group 13
- (a)
One
- (b)
Two
- (c)
Three
- (d)
Four
Which of the following oxides is acidic in nature?
- (a)
B2O3
- (b)
Al2O3
- (c)
Ga2O3
- (d)
In2O3
The exhibition of highest coordination number depends on the availability of vacant orbitals in the central atom. Which of the following element is not likely to act as central atom in MF63-?
- (a)
B
- (b)
AI
- (c)
Ga
- (d)
In
Amphoteric hydroxides react with both alkalies and acids. Which of the following group II metal hydroxides is soluble in sodium hydroxide?
- (a)
\(Be(OH)_2\)
- (b)
\(Mg(OH)_2\)
- (c)
\(Ca(OH)_2\)
- (d)
\(Ba(OH)_2\)
Aluminium metal is corroded in coastal places near to sea, it is due to protective oxide film
- (a)
is removed by sea water
- (b)
reacts with sea water
- (c)
is attacked by salt present in sea water
- (d)
reacts with sand particles
Aluminium deposited as vapours on glass forms a good mirror, because
- (a)
it has better shine than Ag
- (b)
it does not scratch
- (c)
coating is much smoother
- (d)
it does not tarnish in air
Identify the correct formula of halides of alkaline earth metals
- (a)
\(BaCl_2\ .\ 6H_2O\)
- (b)
\(CaCl_2\ .\ 6H_2O\)
- (c)
\(BaCl_2\ .\ 4H_2O\)
- (d)
\(SrCl_2\ .\ 4H_2O\)
In the synthesis of sodium carbonates the recovery of ammonia is done by treating \(NH_4Cl\) with \(Ca(OH)_2\). The by-product obtained in this process is
- (a)
\(CaCl_2\)
- (b)
\(NaCl\)
- (c)
\(NaOH\)
- (d)
\(NaHCO_3\)
Mix calcium sulphate with conc. HCl and forms a paste. Bring a pinch of this paste near to the flame, what colour will you obtain?
- (a)
brick red
- (b)
apple green
- (c)
golden yellow
- (d)
crimson red
In curing cement plasters, water is sprinkled from time to time. This helps in
- (a)
Converting sand into silicic acid
- (b)
keeping it cool
- (c)
developing interlocking needle like crystals of hydrated silicate
- (d)
hydrating sand and gravel mixed with cement
SiH4 and O2 mixture on bubbling through water and bubbles coming in contact with air
- (a)
burns with a luminous flame
- (b)
vertex rings of finely divided silica are formed
- (c)
SiH4 + 2O2 \(\rightarrow\) SiO2 + 2H2O, reaction occurs
- (d)
All of the above
The solubilities of carbonates decrease down the magnesium group due to a decrease in
- (a)
lattice energies of solids
- (b)
hydration energies of cations
- (c)
inter-ionic attraction
- (d)
entropy of solution formation
\(KO_2\) is used in space and submarines because it
- (a)
absorbs \(CO_2\) and increases \(O_2\)
- (b)
absorbs moisture
- (c)
absorbs \(CO_2\)
- (d)
produce ozone
The stability of dihalides of Si, Ge, Sn and Pb increases steadily in the sequence
- (a)
GeX2 < SiX2 < SnX2 < PbX2
- (b)
SiX2 < GeX2 < PbX2 < SnX2
- (c)
SiX2 < GeX2 < SnX2 < PbX2
- (d)
PbX2 < SnX2 < GeX2 < SiX2
Heating of an aqueous solution of aluminium chloride to dryness will give
- (a)
Al(OH)Cl2
- (b)
Al2O3
- (c)
Al2Cl6
- (d)
AlCl3