The correct order of solubility in water for He, Ne, Ar, Kr, Xe is :

• He > Ne > Ar > Kr > Xe

• Xe > Kr > Ar > Ne > He

• Ne > Ar > Kr > He > Xe

• Ar > Ne > He > Kr > Xe

For electron affinity of halogens which of the following is correct?

• Br > F

• F > Cl

• Br > Cl

• F > I

Which of the following does not have valence electron in 3d-subshell ?

• Fe (III)

• Cr (I)

• Mn (II)

• P (0)

Which of the following compound is a tribasic acid ?

• H₃PO₄

• H₃PO₂

• H₃PO₃

• H₄P₂O₇

At higher temperature, iodoform reaction is given by

• CH₃CO₂CH₃

• CH₃CO₂C₂H₅

• C₆H₅CO₂CH₃

• CH₃CO₂C₆H₅

1276.

Which of the following is arranged in the increasing order of enthalpy of vaporization?

• NH₃, PH₃, AsH₃

• AsH₃, PH_3, NH₃

• NH₃, AsH₃, PH₃

• PH₃, AsH_3, NH₃

Assertion: HClO₄ is a stronger acid than HClO₃.

Reason : Oxidation state of Cl in HClO₄ is +8 and in HClO₃ +5.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : Sb (II) is not precipitated as sulphide when in its alkaline solution H₂S is passed.

Reason : The concentration of S^2- ion in alkaline medium is inadequate for precipitation.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Assertion : Addition of silver ions to a mixture of aqueous sodium chloride and sodium bromide solution will first precipitate AgBr rather than AgCl.

Reason : K_sp of AgCl < K_sp of AgBr.

• If both assertion and reason are true and reason is the correct explanation of assertion

• If both assertion and reason are true but reason is not the correct explanation of assertion

• If assertion is true but reason is false

• If both assertion and reason are false.

Strongest acid among the following is

• acetic acid

• FCH₂COOH

• F₂CHCOOH

• F₃CCOOH