Reactivity with Halogens and Hydrogen (Group 2)

Q.

Each edge of a cubic unit cell is 400pm long. If atomic weight of the element is 120 and it's density is 6.25 g /cm3 . The crystal lattice is :
1 primitive
2 body centered
3 face centered
4 end centered

Q.

Which of The Following Compound Has Planar Structure?

1. ${\mathrm{XeO}}_4$

2. ${\mathrm{XeF}}_4$

3. ${\mathrm{XeO}}_2{\mathrm{F}}_2$

4. ${\mathrm{XeOF}}_2$

Q.

Strength of H₂O₂ is 15.18 gL^-1, then it is equal to _{_________} volume.

Q.

The value for Henry's constant for helium, hydrogen, nitrogen and oxygen at 293 K are 144.97 kbar, 69.16 kbar, 76.48 kbar and 34.86 kbar respectively. Which of the gas will be having maximum solubility?

1. Helium

2. Oxygen

3. Nitrogen

4. Hydrogen

Q. Potassium crystallizes in a body centered cubic lattice .How many unit cell are present in 2g potassium? ATOMIC MASS of K = 39.

Q. Limiting molar conductivity of which among thefollowing ion is maximum in water at 298 K(1) H\ast(2) Nat40(3) K\ast(4) Ca2+

Q. The structures of beryllium chloride in the solid state and vapour phase, respectively are

1. chain and chain
2. dimeric and chain
3. chain and dimeric
4. dimeric and dimeric

Q. The ionic mobility of alkali metal ions in aqueous solution is Max at
1 Na+
2 K+
3 Rb+
4 Li+

Q.

Aluminium is more reactive than Iron and yet there is less corrosion of Aluminium when both are exposed to air under similar conditions, explain.

Q.

Nitrolim is a mixture of:

1. ${\mathrm{CaCN}}_2+{\mathrm{N}}_2$

2. ${\mathrm{CaCN}}_2+\mathrm{graphite}$

3. ${\mathrm{CaCN}}_2+\mathrm{diamond}$

4. ${\mathrm{CaC}}_2+\hspace{0.17em}\mathrm{graphite}$

Q.

Name the metal that gets a green coating when exposed to air.

Q.

ice crystallises in a hexagonal lattice.at the low temperatures at which the structure was determined, the lattice constants were a= 4.53 Angstroms ; b=7.41 Angstorms .How many H molecules are contained in a unit cell

ans =4 ?

Q.

Which one is the highest melting halide

1. NaCl

2. NaBr

3. NaF

4. Nal

Q.

State the formula and valency of oxide ions.

Q.

Why is carbon is considered tetravalent?

Q. When gypsum is heated to 393 K, it forms

1. $AnhydrousCaS{O}_4$
2. $CaS{O}_4.0.5H_{2}O$
3. $CaS{O}_4.5H_{2}O$
4. Dead burnt plaster

Q. The covalent alkaline earth metal halide $(X=Cl,Br,I)$ is

1. $Sr{X}_2$
2. $Mg{X}_2$
3. $Be{X}_2$
4. $Ca{X}_2$

Q.

Amongst LiCl, RbCl, BeCl₂, MgCl₂, The compounds with greatest and least ionic character respectively are:

1. Mgcl₂ and Becl₂

2. Rbcl and Mgcl₂

3. Licl and Rbcl

4. Rbcl and Becl₂

Q. Q 10/60 Sodium crystallizes in a face centred cubic lattice. Theapproximate number of unit cells in 5.0 g of sodium is (Atomic massof sodium 23 u)

Q. Which of the following compound is paramagnetic- (1) Tetracyanonickelate (II) ion (2) Tetraamminezinc (II) ion (3) Hexaamine chromium (III) ion (4) Diammine silver (I) ion

Q. In a cell, the following reactions take place
$F{e}^{2+}\to F{e}^{3+}+e^{-}{E}_{F{e}^{3+}/F{e}^{2+}}^{\circ }=0.77V$
$2I^{-}\to I_2+2e^{-}{E}_{I_2/I^{-}}^{\circ }=0.54V$

The standard electrode potential for the spontaneous reaction in the cell is $x\times {10}^{–2}V$ at 208 K. The value of $x$ is (Nearest Integer)

Q. Which of the following reactions produces hydrogen?

1. $Mg+H_{2}O$
2. $H_2{S}_2{O}_8+H_{2}O$
3. $N{a}_2{O}_2+2HCl$
4. $Ba{O}_2+HCl$

Q. Chloride of an element A gives neutral solution in water. In the periodic table the element A belongs to

1. First group
2. Third group
3. Fifth group
4. First tansition series

Q.

Why the lattice energy of LiF is higher than the other metallic fluoride?

Q.

Does propanone show tautomerism?

Q. The element that does not exhibit allotropy is:

1. $As$
2. $Sb$
3. $N$
4. $Bi$

Q. What is the relation between number of ions and conductivity of a solution?

Q.

The element which does not exist in liquid state at room temperature are:

1. Br
2. Hg
3. Na
4. Ga

Q. Q. Why alkali and alkaline earth metals have high thermal conductivity?

Q.

Which of the following elements does not form hydride by direct heating with dihydrogen?
(a) Be (b) Mg (c) Sr (d) Ba