141) Sodium metal crystallises in a body centred cubic lattice with edge length of xÅ. If the radius of sodium atom is 1.86Å, the value of x is
View Answer
A) 4.29
Explanation:BCC relation
142) In a mixture of liquids A and B, if the mole fractions of component A in vapour phase and liquid mixture are x1 and x2 respectively, then the total vapour pressure of liquid mixture is (where 
and are the vapour pressures of pure A and B)
and 
are the vapour pressures of pure A and B)A) 
B) 
C) 
D) 
View Answer
C)
Explanation:Raoult’s law
143) A current of 0.5 ampere is passed through molten AlCl₃ for 96.5 seconds. The mass of aluminium deposited at cathode is x mg and volume of chlorine liberated (at STP) at anode is y mL. x and y are respectively
144) R→P is a first order reaction. For this reaction a graph of ln[R] (on y-axis) and time (on x-axis) gave a straight line with negative slope. The intercept on y-axis is equal to (k=rate constant)
145) The correct statements about the properties of colloidal solutions are
→A.Tyndall effect is used to distinguish between a colloidal solution and a true
solution
→B.Zeta potential is related to movement of colloidal particles
→C.Brownian motion in colloidal solution is faster if the viscosity of the solution is
very high
→D.Brownian motion stabilises the sols
→A.Tyndall effect is used to distinguish between a colloidal solution and a true
solution
→B.Zeta potential is related to movement of colloidal particles
→C.Brownian motion in colloidal solution is faster if the viscosity of the solution is
very high
→D.Brownian motion stabilises the sols
146) The ore of which metal is concentrated by leaching?
147) Arrange the following molecules in the correct order of their bond angles: S₈, P₄, S₆, O₃
148) What are the products formed when ammonium dichromate is thermally decomposed?
149) Sulphur dioxide on reaction with chlorine in the presence of charcoal gives compound (A). This on reaction with white phosphorus gives SO₂ and compound (B). The correct statement about ‘B’ is
View Answer
C) ‘B’ in solid state exists as an ionic solid
Explanation:⇒ Formation of Compound (A):
Sulphur dioxide (
) reacts with chlorine (
) in the presence of charcoal (catalyst) to form Sulfuryl chloride (
).Reaction:
Therefore, Compound (A) is
.⇒ Formation of Compound (B):
White phosphorus (
) reacts with sulfuryl chloride to produce phosphorus pentachloride (
) and sulfur dioxide.Reaction:
Therefore, Compound (B) is
.⇒ Analysis of Statement (C):
In the solid state,
does not exist as a simple covalent molecule. It exists as an ionic solid composed of tetrahedral ![[PCl_4]^+](https://www.mcqbits.com/wp-content/ql-cache/quicklatex.com-a8bf9ce0e4e9c12daa2e311f68a7eede_l3.png "Rendered by QuickLaTeX.com")
cations and octahedral ![[PCl_6]^-](https://www.mcqbits.com/wp-content/ql-cache/quicklatex.com-67ff0fff89b03a3e0dc2c8ef9bd436b3_l3.png "Rendered by QuickLaTeX.com")
anions.![2PCl_5 \text{ (solid)} \rightarrow [PCl_4]^+[PCl_6]^-](https://www.mcqbits.com/wp-content/ql-cache/quicklatex.com-94567cb6bbc59a163cda69a2196f39f2_l3.png "Rendered by QuickLaTeX.com")
This makes statement (C) correct.
⇒ Evaluation of Other Options:
– (A): The shape of
in the gas phase is trigonal bipyramidal, not pyramidal.– (B): Hydrolysis of
yields phosphoric acid (
), not phosphorous acid (
).– (D): In the trigonal bipyramidal structure of
, the two axial bonds are longer and weaker than the three equatorial bonds. Thus, not all bonds are equivalent.150) In which of the following transition metal ion (aquated) is not correctly matched with its colour?
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