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The correct  sequence of increasing order of density is:
1. Li < K< Na < Rb < Cs
2. Li < Na < K < Rb < Cs
3. Cs < Rb < K < Na < Li
4. K < Li < Na < Rb < Cs

The order of basic character of given oxides is:
1. Na₂O > MgO > Al₂O₃ > CuO
2. MgO > Al₂O₃ > CuO > Na₂O
3. Al₂O₃ > MgO > CuO > Na₂O
4. CuO > Na₂O > MgO > Al₂O₃

Which of the following exhibits variable oxidation states?

The most common oxidation state of cerium (Ce) is:
1. +5, +3
2. +5, +4
3. +3, +4
4. +3, +5

A common trend in both groups I and II elements in the periodic table, as the atomic number increases, is :
1. Oxidizing power increases
2. Atomic radius increases
3. Maximum valency increases
4. Reactivity with water decreases

Amongst the following electronic configurations, the highest ionization energy
is represented by:
1. [Ne]3s²3p³
2. [Ne]3s²3p²
3. [Ar]3d¹⁰4s²4p³
4. [Ne]3s²3p¹

The electronic configuration of the most electropositive element is:
1. [He]2s¹
2. [Xe]6s¹
3. [He]2s²
4. [Xe]6s²

Element that has the greatest tendency to lose an electron is :

Zinc (Zn) and Cadmium (Cd) generally do not exhibit variable oxidation states, unlike most transition elements. This behavior is primarily attributed to:
1. Softness
2. Completed 'd' orbital
3. Two electrons in outermost orbit
4. Low m.p.

The electronegativity of the following elements increases in the order of:

Among the following species, the smallest ion is : 

 The correct order for electron affinity of halogens is :
1. Br > F
2. F > Cl
3. Br > Cl
4. F > I

An ion that has the largest size among the following is :
1. Li⁺(aq)
2. Cs⁺(aq)
3. Li⁺(g) 
4. K⁺(aq)

Which of the following correctly represents both the increasing order of ionic radii and
 the decreasing order of the number of protons?
1. Ca⁺², K⁺, Cl^-, S^-2
2. Cl^-, Ca⁺², K⁺, S^-2
3. S^-2, Cl^-, Ca⁺², K⁺
4. None of the above

The element having very high electron affinity but zero ionisation enthalpy is:
1. He (due to inert gas configuration)
2. Be (due to fully filled subshell)
3. H (due to presence of allotropes)
4. None of the above

The incorrect match among the following is:
1. B < C < N < O (increasing first ionisation enthalpy)
2. I < Br < F < Cl (increasing electron gain enthalpy)
3. Li < Na < K < Rb (increasing metallic radius)
4. Al³⁺ < Mg²⁺ < Na⁺ <F^- (increasing ionic size)

Which of the following compounds has a higher hydration energy than the lattice energy?
1. BaSO₄                           
2. MgSO₄
3. CaSO₄                           
4. SrSO₄

A compound contains three elements A, B and C, if the oxidation number of A =+2, B =+5 and C =-2, the possible formula of the compound is:

Incorrect statement about characteristics regarding halogens is :
1. Ionization energy decreases with increase in atomic number.
2. Electronegativity decreases with increase in atomic number.
3. Electron affinity decreases with increase in atomic number.
4. Enthalpy of fusion increases with increase in atomic number. 

The process requiring the absorption of energy is :
1. $F\to F^{-}$
2. $H\to H^{-}$
3. $Cl\to C{l}^{-}$
4. $O\to O^{2-}$