Anomalous Behaviour of Fluorine

Q.

When KMnO4 acts as an oxidising agent and ultimately forms [MnO4]-2, MnO2, Mn2O3, Mn+2 then the number of electrons transferred in each case respectively is

1. 4, 3, 1, 5

2. 1, 5, 3, 7

3. 1, 3, 4, 5

4. 3, 5, 7, 1

Q.

The value of $I{P}_1$, $I{P}_2$, $I{P}_3$ and $I{P}_4$ of an atom are respectively 7.5 eV, 25.6 eV, 48.6 eV and 170.6 eV. The electronic configuration of the atom will be

1. 1s², 2s², 2p⁶, 3s², 3p³

2. 1s², 2s², 2p⁶, 3s²

3. 1s², 2s², 2p⁶, 3s², 3p¹

4. 1s², 2s², 2p⁶, 3s¹

Q. Stability decreases in the order

1. H-F > H-Cl > H-Br > H-I
2. H-Cl > H-F > H-Br > H-I
3. H-F > H-Br > H-Cl > H-I
4. H-F > H-Cl > H-I > H-Br

Q. According to CIP rule, the correct order of priority is :- (1) –OH > –CH2OH > –CHO > –COOH (2) –OH > –COOH > –CHO > –CH2OH (3) –COOH > –OH > –CHO > –CH2OH (4) –COOH > –CHO > –CH2OH > –OH

Q. 19. What happen when methyl iso cyanide us refuced in presence of lithium. Aluminium hydride (LiALH4)

Q. 21. Assertion: The formal oxidation number of sulphur in Na2S4O6 is 2.5 Reason: Two S-atoms are not directly linked with O-atoms

Q. stability order of +1 states of boron family

Q. 30. select incorrect among the following (1) levelling effect of water indicate mineral acids appear to be equally strong due to its complete ionisation (2)order of acidic strength in ch3cOOh solvent is HNO3

Q.

Which element has the highest electronegativity
Or
Which of the following is the most electronegative

1. F

2. Ne

3. He

4. Na

Q.

In SF4 molecule, the lone pair of electrons occupies the equatorial position in preference to an axial position in the overall trigonal bipyramidal geometry

Q.

Predict the molecular shape of the OF₂ molecule.

1. Bent

2. Trigonal planar

3. Linear

4. Tetrahedral

Q.

what are the anomalous properties of first element in each group ??

Q. The gases produced when 18 g of carbon reacts with 5 litre of oxygen at 18^†extdegree C and 5 atm pressure are treated with 0.5 litre of 2M NaOH. Calculate the concentration of sodium carbonate and sodium bicarbonate produced by the reaction of CO_2 with NaOH. (CO has no reaction under these conditions)

Q. Excess of KI and dil. H_2SO_4 were mixed in 50 ml H_2O_2. Thus, I_2 liberated requires 20 ml of 0.1 N Na_2S_2O_3. What will be the strength of H_2O_2 in gL^{-1

Q. Acidity increases in the order

1. H-F > H-Cl > H-Br > H-I
2. H-F < H-Cl < H-Br < H-I
3. H-F > H-Cl < H-Br > H-I
4. H-F > H-Cl > H-Br < H-I

Q. Fluoride can form polyfluorides $F_3^{-}$ - True or False?

1. True
2. False

Q. In the lecture INTERMEDIATE COMPOUNDS, in the order of overall stability, 3 degree carbocation and tertiary carbocation are placed separately. Differentiate 3 degree carbocation and tertiary carbocation.

Q.

Why gases such as hydrogen and heleium are not liquefied at room temperature by applying very high pressure?

Q.
Among the given species the Resonance stablised carbocations are:

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1. (C) and (D) only
2. (A), (B) and (C) only
3. (A) and |(B) only
4. (A), (B) and (D) only

Q.

Arrange the following in order of increasing acid strength

(i) HBr, HCl , HF , HI

(ii) CH₄ , H₂O , HF , NH₃

Q. The gases preduced when 18 g carbon reacts with 5 litre of oxygen at 18^° C and 5 atm pressure aretreated with 0.5 litre of 2 M NaOH. Calculate the concentration of sodium carbonate andsodium bicarbonate produced by the action of co with NaOH. (CO has no reaction underhese condtions)

Q. Which of the following cannot be hydrolysed?

1. $SiC{l}_4$
2. $O{F}_2$
3. $NC{l}_3$
4. $S{F}_4$

Q. Why does hydrogen occupy unique position in the periodic table ??