Solution

In the following reaction H₂O₂ acts as a reducing agent.
PbO₂(s) + H₂O₂ (aq) ⟶ PbO(s) + H₂O(l) + O₂ (g)

Which of the following is false about H₂O₂

Act as both oxidising and reducing agent
Two OH bonds lies in the same plane
Pale blue liquid
Can be oxidised by ozone

Solution

The value of dipole moment of H₂O₂ is 2.1 D, which suggest the structure of H₂O₂ cannot be planar.An open-book structure is suggested for H₂O₂ in which O – H bonds lie in different plane.

Blackened oil painting can be restored into original form by the action of

Chlorine
BaO₂
H₂O₂
MnO₂

Solution

The critical temperature of water is higher than that of O₂ because H₂O molecule has

Fewer electrons than oxygen
Two covalent bonds
V-shape
Dipole moment

Solution

Critical temperature of water is more than O₂ due to its dipole moment (Dipole moment of water= 1.84 D;Dipole moment of O₂ = zero).

In context with the industrial preparation of hydrogen from water gas (CO + H₂), which of the following is the correct statement?

CO and H₂, are fractionally separated using differences in their densities
CO is removed by absorption in aqueous Cu₂Cl₂ solution
H₂ is removed through occlusion with pd
CO is oxidised to CO₂ with steam in the presence of a catalyst followed by absorption of of CO₂ in alkali

Solution

Which of the following statements in relation to the hydrogen atom is correct ?

3s, 3p and 3d orbitals all have the same energy
3s and 3p orbitals are of lower energy than 3d orbital
3p orbital is lower in energy than 3d orbital
3s orbital is lower in energy than 3p orbital

Solution

Which of the following species is diamagnetic in nature?

\(H_{2}^{-}\)
\(H_{2}^{+}\)
H₂
\(He_{2}^{+}\)

Solution

Which one of the following processes will produce hard water ?

Saturation of water with MgCO₃
Saturation of water with CaSO₄
Addition of Na₂SO₄ to water
Saturation of water with CaCO₃

Solution

Permanent hardness of water is due to chlorides and sulphates of calcium and magnesium i.e CaCl₂, CaSO₄,MgCl₂ and MgSO₄.

Choose the correct statement:The reason for use of polyphosphates as water softening agents is, that

they form soluble complexes with anionic species
they precipitate out cationic species
they precipitate out anionic species
they form soluble complexes with cationic species

Solution

DIRECTION : These are Assertion-Reason type question.Question contains two statements:Statement-1 (Assertion) and Statement-2 (Reason). Answer these questions from the following four options.

Statement-1 :Hydrogen peroxide forms two series of salts called peroxides.
Statement-2 :Hydrogen peroxide molecule has two replaceable hydrogen atom

Statement-1 is True, Statement-2 is True, Statement-2 is a correct explanation for Statement -1
Statement-1 is True, Statement -2 is True ; Statement-2 is NOT a correct explanation for Statement - 1
Statement-1 is True, Statement- 2 is False
Statement-1 is False, Statement -2 is True

Solution

Both Assertion (A)and reason (R) are true. Hydrogen peroxide forms two series of salts called hydro peroxides and peroxides.

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