JEE Questions for Chemistry Sblock Elements Quiz 5 - MCQExams.com

Photo electric effect is maximum in ...
  • Cs
  • K
  • Na
  • Li
The sequence of hydration enthalpy in following ion is ...
  • Rb+ > K+ > Cs+ > Na+ > Li+
  • Li+ > Na+ > K+ > Rb+ > Cs+
  • K+ > Na+ > Rb+ > Cs+ > Li+
  • Cs+ > Rb+ > K+ > Na+ > Li+
In case of alkali metals, the covalent character increases in the order :
  • MI > MBr > MCl < MF
  • MF < MCl < MBr < MI
  • MBr < MCl < MI < MF
  • MF < MBr < MCl < MI
Among the following the least thermally stable is ?
  • K2CO3
  • Na2CO3
  • BaCO3
  • Li2CO3
Which of the following oxides is amphoteric in nature ?
  • MgO
  • BeO
  • CaO
  • BaO
Which of the following characteristics is not related to alkali metals ?
  • Their ions are iso electronic with noble gases.
  • low melting point
  • low electronegativity
  • high ionisation energy
Fill in the blanks with proper option given below for the following statement. “All the halides of alkaline earth metals with exception of ‘‘_________ ’’ areionic in nature.”
  • Barium halide
  • Strontium halide
  • Beryllium halide
  • Calcium halide
K2CO3 can not be prepared by solvay ammonia process because ...
  • K2CO3 is fairly soluble in water
  • It has no water of crystallization
  • KHCO3 is highly soluble in water
  • K2CO3 decomposes in H2O
The reaction of Cl2 with X gives bleaching powder X is ....
  • CaO
  • Ca(OH)2
  • Ca(OCl)2
  • Ca(O3Cl)2
Which of the following alkaline earth metal sulphates has hydration enthalpy higher than the lattice enthalpy ?
  • SrSO4
  • MgSO4
  • CaSO4
  • BaSO4
Which of the following compounds is most stable ?
  • LiCl
  • LiI
  • LiBr
  • LiF
Flame test is not given by ...
  • Be
  • Sr
  • K
  • Ca
The alkaline earth metals forming ionic oxides are ...
  • MgO
  • BeO
  • CaO
  • (and (3)
Which of the following has the lowest melting point ?
  • LiCl
  • KCl
  • NaCl
  • RbCl
The highest lattice energy corresponds to ...
  • MgO
  • CaO
  • SrO
  • BaO
Out of Li, Na, K, Rb and Cs how many of them directly form super oxides on heating with oxygen ?
  • 5
  • 2
  • 3
  • 4
How many of the following metals when heated in an atmosphere of N2 gas form nitrides ?
Li, Na, K, Rb, Cs, Mg, Ca, Sr, Ba
  • 9
  • 5
  • 3
  • 6
Which of the following has maximum lattice energy ?
  • Li2O
  • Na2O
  • MgO
  • BaO
Which of the following pairs of elements possess diagonal relationship ?
  • Li and Mg
  • Li and Al
  • Na and Mg
  • Cs and Ba
A sample of portaland cement contain 23% SiO2 , 3% Al2O3 and 2% Fe2O3 then what would be its silica module (n) ?
  • 3.83
  • 28
  • 21.73
  • 4.6
For a good quality of cement, the ratio of silica (SiO2) and alumina (Al2O3) must be between...
  • 3 to 5
  • 2.5 to 4
  • 6 to 7.5
  • 4 to 5.5
Chlorophyll and heamoglobin are complex of ‘‘______ ’’ and ‘‘______’’ respectivelly.
  • Mg2+ and Ca2+
  • Na+ and K+
  • Mg2+ and Fe2+
  • Cl– and Fe2+
Which of the following metal ions plays an important role in muscle contraction ?
  • K+
  • Mg2+
  • Na+
  • Ca2+
White enamel of our teeth is ...
  • Ca3(PO4)2
  • CaCl2
  • CaF2
  • CaBr2
Two mole of magnesium nitride on reacting with an excess of water gives :
  • One mole of ammonia
  • Two moles of nitric acid
  • Four moles of ammonia
  • Three moles of ammonia
Which of the following metal is used in windows of X - ray tubes ?
  • Be
  • Mg
  • Ba
  • Al
Which of the following is not a Mg ore ?
  • Magnesite
  • Gypsum
  • Dolomite
  • Carnalite
Which of the following exists in polymeric form ?
  • AlCl3
  • SiC
  • BeCl2
  • B2H6
The electronic configuration of metal M is 1s2 2s2 2p6 3s2 . The formula of its oxide would be ...
  • MO
  • M2O
  • M2O3
  • MO2
When NaOH is made, the gas released at the cathode is ...
  • Cl2
  • H2
  • O2
  • H2O
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