Chemistry - Chemistry of s and p Block Elements
Exam Duration: 45 Mins Total Questions : 30
Which one of the following pairs of icons have the similar size?
- (a)
Be2+ and Al3+
- (b)
Be2+ and Mg2+
- (c)
B3+ and Al3+
- (d)
C4+ and Si4+
Ammonia and phosphine resemble with each other in
- (a)
solubility in water
- (b)
forming salt with acid
- (c)
stability
- (d)
reducing character
P2O5 when treated with cold water produced
- (a)
orthophosphoric acid
- (b)
metaphosphoric acid
- (c)
pyrophosphoric acid
- (d)
hypophosphoric acid
[L]+H2SO4\(\longrightarrow\)[M] a colourless gas with irritating smell.[M]+K2Cr2O7+H2+H2SO4\(\longrightarrow\)solutioon [L] and [M] are
- (a)
\(SO^{2-}_3,SO_2\)
- (b)
Cl-,HCl
- (c)
S2-
- (d)
\(CO^{2-}_3,CO_2\)
Which of the following properties is not shown by NO?
- (a)
it is diamagnetic in gaseous state
- (b)
it is a neutral oxide
- (c)
it combines with oxygen to form nitrogen dioxide
- (d)
its bond order is 2.5
In which of the following arrangements, sequence is not strictly according to property written against it?
- (a)
CO2
- (b)
HF
- (c)
NH3>PH3
- (d)
B
Identify the incorrect statement among the following.
- (a)
ozone reacts with SO2 to give SO3
- (b)
Silicon reacts with NaOH(aq) in the presence of air to give Na2SiO3 and H2O
- (c)
Cl2 reacts with excess of NH3 to giveN2 and HCl
- (d)
Br2 reacts with hot and strong NaOH solution to give NaBr, NaBrO4 and H2O
Point out the halogen which does not react with water?
- (a)
F2
- (b)
Cl2
- (c)
Br2
- (d)
HI
Cl2O is an anhydride of
- (a)
HClO4
- (b)
HOCl
- (c)
HClO2
- (d)
Cl2O3
The Poisson's ratio for inert gases is
- (a)
1.40
- (b)
1.66
- (c)
1.34
- (d)
1.54
The rare gases are unreactive because they
- (a)
have the same number of electrons
- (b)
have an atomicity of one
- (c)
are gases with low densities
- (d)
have stable electronic configuration or closed valence shell
Which one of the following reaction of xenon compounds is not feasible?
- (a)
XeO3+6HF\(\longrightarrow\)XeF6+3H2O
- (b)
3XeF4+6H2O\(\longrightarrow\)2Xe+XeO3+12HF+O2
- (c)
2XeF2+2H2O\(\longrightarrow\)2Xe+4HF+O2
- (d)
XeF6+RbF\(\longrightarrow\)Rb[XeF7]
The order o decreasing ionisation enthalpy in alkali metals is
- (a)
Na > Li > K > Rb
- (b)
Rb < Na < K < Li
- (c)
Li > Na > K > Rb
- (d)
K < Li < Na < Rb
Which of the following element shows stable compounds in +1 oxidation state?
- (a)
B
- (b)
Al
- (c)
Ga
- (d)
Tl
Some of the group II metal halides are covalent and soluble in organic solvents. Among the following metal halides, the one which is soluble in ethanol is
- (a)
\(BeCl_2\)
- (b)
\(MrCl_2\)
- (c)
\(CaCl_2\)
- (d)
\(SrCl_2\)
Which of the following pair cannot exist together in solution?
- (a)
\(Na_2CO_3\ and\ NaHCO_3\)
- (b)
\(NaHCO_3\ and\ NaOH\)
- (c)
\(Na_2CO_3\ and\ NaOH\)
- (d)
\(NaOH\ and\ NaCl\)
Match the following and choose the correct option
| Column I | Column II |
| A. \(CaCO_3\) | p. Dentistry, ornamental work |
| B. \(Ca(OH)_2\) | q. Manufacturer of sodium carbonate from caustic soda |
| C. CaO | r. Manufacture of high quality paper |
| D. \(CaSO_4\) | s. Used in white washing |
- (a)
A B C D r s q p - (b)
A B C D s q p r - (c)
A B C D q s r p - (d)
A B C D s r q p
The two types of bonds present in B2H6 are covalent and
- (a)
ionic
- (b)
coordinate
- (c)
hydrogen bridge
- (d)
Both (a) and (c)
Al2O3 can be converted to anhydrous AlCl3 by heating from
- (a)
a mixture of Al2O3 and carbon in dry Cl2 gas
- (b)
Al2O3 with Cl2 gas
- (c)
Al2O3 and HCl gas
- (d)
Al2O3 with NaCl in solid state
Which statement is correct w.r.t. the property of the elements with increase in atomic number in the group IV A?
- (a)
Their metallic character decreases
- (b)
The stability of +2 oxidation state increases
- (c)
Their ionisation energy increases
- (d)
Their atomic size decreases
What is the best description of the change that occurs when \(Na_2O\) (s) is dissolved in water?
- (a)
Oxidation number of sodium decreases
- (b)
oxide ion accepts sharing in a pair of electrons
- (c)
oxide ion donates a pair of electrons
- (d)
oxidation number of oxygen increases
What will you get when you heat hydrated \(CaSO_4\) to \(125^oC\) instead of \(200^oC\)?
- (a)
\(CaO+SO_3\)
- (b)
\(CaSO_4\)
- (c)
\(CaSO_4.{3\over 4}H_2O\)
- (d)
\((CaSO_4)_2.H_2O\)
The product formed in the reaction,
BCl3 + H2O \(\rightarrow\) product (X) ; X is
- (a)
H3BO3 + HCl
- (b)
B2O3 + HOCl
- (c)
B2H6 + HCl
- (d)
No reaction
Man dies in an atmosphere of carbon monoxide (CO), because it
- (a)
combines with the O2 present in the body to form CO2
- (b)
reduces the organic matter of tissues
- (c)
combines with haemoglobin of blood, making it incapable of absorbing O2
- (d)
dries up the blood
The reason for small radius of Ga compared to Al is
- (a)
poor screening effect of f-orbitals
- (b)
decrease in nuclear charge
- (c)
presence of higher orbitals
- (d)
higher atomic number
Berylium and aluminium exhibit many properties which are similar. But many properties which are similar. But the two elements differ in
- (a)
exhibiting maximum covalency in compounds
- (b)
forming polymeric hydrides
- (c)
forming covalent halides
- (d)
exhibiting amphoteric nature in their oxides
Aluminium chloride exists as dimer, Al2Cl6 in solid state as well as in solution of non-polar solvent such as benzene. When dissolved in water, it gives
- (a)
Al3+ + 3Cl-
- (b)
[Al(H2O)6]3+ + 3Cl-
- (c)
[Al(OH)6]3- + 3HCl
- (d)
Al2O3 + 6HCl
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