Trend in Ionisation Enthalpy

Q.

The volume of $C{O}_2$ evolved at STP on heating 50 gram of calcium carbonate

Q.

How would you explain the fact that the first ionization enthalpy of sodium is

lower than that of magnesium but its second ionization enthalpy is higher than

that of magnesium?

Q. 10. vapour density of the equilibrium mixture of the reaction SO2Cl2 --->SO2 + Cl2 is 50.0. percent dissociation of SO2Cl2 is: a)33.33 b)35.0 c)30.0 d)66.67

Q. 6. When anion leaves the normal site and electron occupies interstitial site in the crystal lattice it is called what

Q. Which of the following is used in photoelectric cells?

1. Na

2. Cs

3. All of these

4. Li

Q. If we plot a graph of freuency of radiation against the stopping potential of photoelectron, its slope would be equal to (1) 6.625×10^{-34} (2) 3.656×10^{12} (3) 2.414×10^{14} (4) 6.529×10^{18

Q. The velocity of electron in third excited state ofBe3+ ion will be :-31.3(1)(2.188 107ms-1(2)(2.188 1()-ms-44(3) (2.188x 109 Kms-1(4) (2.188x i07 Kms"

Q.

The lowest first ionization energy would be associated with which of the following electronic configurations

1. 1s² 2s² 2p⁶ 3s¹

2. 1s² 2s² 2p⁵

3. 1s² 2s² 2p⁶

4. 1s² 2s² 2p⁶ 3s² 3p²

Q. Which element has greatest tendency to lose electrons?

1. F

2. S

3. Fe

4. Be

Q.

Match list-I with list-II and select the correct answer using the codes given below -

List-I List-II

Ion Radius (in pm)

(I) Li+ (a) 216

(II) Na+ (b) 195

(III) Br- (c) 60

(IV) I- (d) 95

Codes: I II III IV

1. ib, iic, iiia, ivd

2. Ia, IIb, IIId, IVc

3. ic, iid, iiib, iva

4. id, iic, iiib, iva

Q.

Are larger atoms more polarizable?

Q. H2 is a stable molecule, but Why C2 is not?

Q. The ratio of number of moles of KMnO4and K2r207 required to oxidise 0.1 mol Sn2+ to Sn+4 in acidic medium

Q. the observed dipole moment of hcl is 1.03D bond length is 1.275A then the precentage of ionic character is

Q. CO2 crystallined into FCC. calculate numbr of atoms present in 1 unit cell of CO

Q. If we plot a graph of radiation against the stopping potential of photoelectron, its slope would be equal to

Q. Which of the following(s) represent the correct order of first ionisation energy of d-block elements?

Q. the unit in which the solubility product of barium phosphate is exprressed is (1)mol^2dm^-6 (2)mol^3dm^-9 (3)mol^4dm^-12 (4)mol^5dm^-15

Q. 29.In alkaline medium ClO2 oxidise H2O2 to O2 and reduced itself to Cl-(chloride ion) then how many mole of H2O2 will be oxidised by one mole of ClO2 ?

Q. The first ionisation energy of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation?

1. Lesser effective nuclear charge of oxygen than nitrogen
2. Lesser atomic size of oxygen than nitrogen
3. Due to stability of half-filled electronic configurations
4. Greater effective nuclear charge of oxygen than nitrogen

Q.

An element has successive ionization enthalpy as 940, 2080, 3090, 4140, 7030, 7870, 16000 and 19, 500 KJ/mole. To which group of the periodic table does the element belong to?

1. 14

2. 15

3. 16

4. 17

Q. 13. in which of the following molecule stabilizes by removal of electron 1)C_2 2)O_2 3)N_2 4)H_2

Q.

Which of the following represent the correct order of decreasing $I{E}_1$ for Ca, Ba, S, Se and Ar?

1. S < Se < Ca < Ba < Ar

2. Ba < Ca < Se < S < Ar

3. Ca < Ba < S < Se < Ar

4. Ca < S < Ba < Se < Ar

Q.

The element with the highest first ionisation potential is

1. Boron

2. Carbon

3. Nitrogen

4. Oxygen

Q. 2. Derive in fcc .nearest tetrahedral and octahedral void distance.

Q. ques. 0.59g of silver salt of an organic acid (molar mass 210) on ignition gave 0.36g of pure silver. the basicity of acid is : (a)2 (b)3 (c)4 (d)

Q.

The factor not affecting ionisation enthalpy is

1. Charge in the nucleus

2. Size of atom

3. Type of bonding in the crystal lattice

4. Type of electron involved

Q. 21.he no. of O-atoms required to combine with 7 g. nitrogen to form N2O3 if 80% of N2 is converted into products??

Q. 32.Does sulpahte ion have dative bond

Q. 6. Which one of the following compounds has the electron pair geometry as the trigonal bipyramid with three equatorial positions occupied by lone pairs of electrons? A) [AlCl3] B) XeF2 C) [ Pt(NH3)2 Cl2] D) CH3-Mg-Br