Ionic Radii and Ionisation Enthalpy (Group 2)

Q.

For alkali metals , which of the following trends is incorrect?

1. Hydration energy: Li > Na > K > Rb

2. Ionization enthalpy: Li > Na > K > Rb

3. Density: Li < Na < K < Rb

4. Atomic size: Li < Na < K < Rb

Q.

The boiling point of acetone is

Q. The amphoteric hydroxide is

1. $Mg(OH{)}_2$
2. $Be(OH{)}_2$
3. $Ca(OH{)}_2$
4. $Sr(OH{)}_2$

Q. Which of the alkali metal chloride $\left(MCl\right)$ forms its dihydrate salt $\left(MCl.2H_{2}O\right)$ easily ?

1. $CsCl$
2. $RbCl$
3. $LiCl$
4. $KCl$

Q.

Why is Magnesium paramagnetic?

Q. There is an anomalous property of lithium given in comparison with other alkali metals is that , LiCl is deliquescent and crystallises as hydrate , LiCl.2H2O.where as other alkali do not form hydrates. IN THIS ANAMOLOUS BEHAVIOUR WHAT IS THE MEANING OF DELIQUESCENT. SIR/MAM PLEASE EXPLAIN THIS WORS BRIEFLY.🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔🤔😕😕😕😕.

Q.

Is OF2 oxygen fluoride or oxygen difluoride ?

Q.

A metal $\mathrm{M}$readily forms its sulfate ${\mathrm{MSO}}_4$ which is water-soluble. It forms its oxide $\mathrm{MO}$ which becomes inert on heating. It forms an insoluble hydroxide $\mathrm{M}{\left(\mathrm{OH}\right)}_2$ which is soluble in $\mathrm{NaOH}$ solution. Then $\mathrm{M}$ is

1. $\mathrm{Ba}$

2. $\mathrm{Be}$

3. $\mathrm{Ca}$

4. $\mathrm{Mg}$

Q. $AgCl$ is colourless whereas $AgI$ is yellow, because of

1. $A{g}^{+}$ have $18$ electron shell to screen the nuclear charge
2. $A{g}^{+}$ shows pseudo inert gas configuration
3. Distortion of $I^{-}$ is more pronounced than $C{l}^{-}$ ion
4. Existence of $d-d$ transition

Q.

p block , s block, d block elments is usally paramagnetic or diamagnetic

Q. The first and second ionisation enthalpies (kJ/mol) of three elements A, B and c are given as A. B. C. (IE 1). 403. 549. 1142. 2640. 1040. 2080. Identify the element which is likely to be. (a) a non metal (b) an alkali metal (c) an alkaline earth metal.Also give reasons.

Q. Monoclinic sulphur has a melting point of 393K but it form rhobic sulphur in 369K .why ?

Q. Which of the following properties of elements of alkaline earth metals do not increase with increasing atomic number?

1. Solubility of hydroxide
2. Reactivity with water
3. Stability of carbonate
4. First ionisation enthalpy

Q. Among the alkaline earth metals, the element forming predominantly covalent compounds is:

1. Barium
2. Beryllium
3. Strontium
4. Calcium

Q. Which of the following are correct for henry's constant $K_H$?

1. Greater the value of $K_H$, lower is the solubility of the gas at the same pressure and temperature
2. $K_H$ decreases with increase in temperature
3. The unit of $K_H$ is bar
4. All noble gases have the same value of $K_H$ at the same temperature

Q. 14. A urea solution has boiling point 373.128K then what is its melting point ? Given kf =1.86 and kb =0.52.

Q.

12g of me on the reacting with acid gives hydrogen gas the volume of which at stp is

Q.

Which of the following salt does not impart colour to the flame?

1. LiCl

2. MgCl₂

3. SrCl₂

4. BaCl₂

Q. The ionisation energy of an electron in the lowest orbit of hydrogen atom is 13.6 eV. What are the energies required in eV to remove electron from 3 lowest orbits of hydrogen atom ??

Q. The value of X is maximum for

1. 
2. 
3. 
4. all have the same value of x

Q. 1000 g H2O have 0.1 mole urea and its freezing point is -0.2 degree now its freezed up to -2 degree then how much amount of ice will form​

Q. X moles of KCl and y moles of BaCl2 are both dissloved in 1kg of water is 1.85 K/ molal what is the observed range of change in freezing temperature if the ratio of x to y is

Q. The first ionization enthalpy of magnesium is lower than the first ionization enthalpy of:

1. Lithium
2. Sodium
3. Calcium
4. Beryllium

Q. Choose the correct statement(s):

1. Ionization energy of alkaline earth metals is greater than that of alkali metals
2. All of the above.
3. Atoms of alkaline earth metals are smaller in size than alkali metals
4. Atomic and ionic radii of alkaline earth metal increase with increase in atomic number.

Q. Which of the following alkaline earth metal doesn’t impart any colour to the Bunsen flame?

1. 
2. 
3. 
4. 

Q. The alkaline earth metal nitrate that does not crystallise with water molecules is:

1. $Sr(N{O}_3{)}_2$
2. $Mg(N{O}_3{)}_2$
3. $Ca(N{O}_3{)}_2$
4. $Ba(N{O}_3{)}_2$

Q. Which of the following elements will have highest ionisation energy?

1. $1s^{2}2s^{2}2p^{6}3s^1$
2. $1s^{2}2s^{2}2p^{6}3s^{2}3p^3$
3. $1s^{2}2s^{2}2p^{6}3s^{2}3p^4$
4. $1s^{2}2s^{2}2p^{6}3s^{2}3p^1$

Q. What is the order of melting point inMgO, CaO, BeO, BaO

Q. Assertion(A) : Beryllium and magnesium do not impart characteristic colour in flame.
Reasoning(R) : Both Beryllium and magnesium have high I.E.

1. Assertion is true but Reason is false
2. Both Assertion and Reason are false
3. Both Assertion and Reason are true and Reason is the correct explanation of Assertion
4. Both Assertion and Reason are true but Reason is not a correct explanation of Assertion

Q. The oxide that shows a magnetic property is:

1. $Si{O}_2$
2. $N{a}_{2}O$
3. $M{n}_3{O}_4$
4. $MgO$