Oxygen does not form OF 6 because

There are no vacant d- orbitals available

Chemistry - Pblock Elements Xii - Quiz-5

A diamagnetic element burns in air to form a dioxide.This dioxide can reduce iodine to HI. When H₂ gas is bubbled through this element, it forms a hydride.It was found that the reaction of the dioxide and hydride of this element produces the same metal again.The element is

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S
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Si
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Te
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PO

Point out the incorrect statement among the following :

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The oxidation state of oxygen is +2 in OF₂.
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Acidic character follows the order H₂O < H₂S < H₂Se < H₂Te.
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The tendency to form multiple bonds increases in moving down the group from sulphur to tellurium (towards C and N)
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Sulphur has a strong tendency to catenate while oxygen shows this tendency to a limited extent.

Which of the following statements is unacceptable?

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Among HClO₃, HClO₄,HClO and HClO₂, HClO₃ is the weakest acid.
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Bromide ion can be oxidised to Br₂ by chlorine.
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Cl₂O₇ is the anhydride of HClO₄.
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Among halide ions, F^- has the highest hydration energy.

Moist ammonia gas is dried over

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P₂O₅
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Anhydrous CaCl₂
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Quick lime
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Conc. H₂SO₄

The correct order for the increasing acidic strength of oxides of nitrogen is -

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$N_{2} O < NO < N_{2} O_{4} < N_{2} O_{3} < N_{2} O_{5}$
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$N_{2} O < NO < N_{2} O_{3} < N_{2} O_{4} < N_{2} O_{5}$
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$N_{2} O < N_{2} O_{3} < N_{2} O_{4} < N_{2} O_{5} < NO$
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$NO < N_{2} O < N_{2} O_{3} < N_{2} O_{4} < N_{2} O_{5}$

In the compounds of the type POX₃, the P atom multiple bond is of the type

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$p π - pπ$
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$d π - dπ$
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$p π - dπ$
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None of these

Which of the following statements are not true for phosphorus

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It is non-metal
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It exists as a tetrahedral molecular solid
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It is less reactive than nitrogen
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P-P bond is much weaker than $N \equiv N$ bond

Dipole moment is highest for

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NCl₃
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NBr₃
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NI₃
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NF₃

The basicity of the acids H₃PO₂, H₃PO₃, H₃PO₄ and H₄P₂O₇ are respectively

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() 1,2,3,7
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() 2,3,4,7
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() 1,2,3,4
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() 1,2,3,5

The correct order of decreasing Lewis acid strength of trichlorides of group 15 elements is

$(A) A s C l_{3} > P C l_{3} > B i C l_{3} > S b C l_{3} (B) P C l_{3} > A s C l_{3} > S b C l_{3} > B i C l_{3} (C) N C l_{3} > P C l_{3} > A s C l_{3} > S b C l_{3} (D) S b C l_{3} > B i C l_{3} > P C l_{3} > A s C l_{3}$

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1
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2
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3
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4

Which of the following flourides has the least capacity as fluoride ion acceptor

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AsF₅
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SbF₅
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PF₅
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None of these

The ionic character of H-X is highest in

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HBr
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HI
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HF
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HCl

The strongest acid is

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H₃PO₂
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H₃PO₃
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H₄P₂O₇
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H₃PO₄

Which of the following HY(hydra-acid of halogen) is the strongest acid, best reducing agent, is the least stable and is easily oxidised

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HF
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HCl
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HBr
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HI

Strength of halogen acids, HF,HCl,HBr and HI varies in the order

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HF>HCl>HBr>HI
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HF>HBr>HI>HCl
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HBr>HI>HCl>HF
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HI>HBr>HCl>HF

Fluorine does not form oxyacids because -

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It is most electronegative
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It is the most powerful oxidising agent
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It has vacant d- orbitals
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None of the above

Which is correct order of basic strength

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() $O C l^{-} > C l O_{2}^{-} > C l O_{3}^{-} > C l O_{4}^{-}$
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() $C l O_{4}^{-} > C l O_{3}^{-} > C l O_{2}^{-} > C l O^{-}$
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() $C l O_{3}^{-} > C l O_{4}^{-} > C l O_{2}^{-} > C l O^{-}$
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() None of these

Which of the following does not form stable pentoxide

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As
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Sb
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Bi
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P

Which is the correct order order of decreasing boiling point of azeotropic mixtures HX-H₂O

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HI,HBr,HF,HCl
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HI,HCl,HBr,HF
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HF,HCl,HBr,HI
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HCl,HF,HBr,HI

F₂ reacts with dilute NaOH to give oxygen difluroide. The formula is

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F₂O
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OF₂
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F₂O₂
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F₂O₃

Which of the following oxyacids of chlorine is least tendency to get oxidise?

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HOCl
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HClO₂
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HClO₃
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HClO₄

Which of the following is most basic

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F^-
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Cl^-
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Br^-
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$I^{-}$

Which of the following is responsible for turning moist starch iodide paper blue when it is brought in contact with O₃?

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Liberation of iodine
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Liberation of O₂
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Formation of alkali
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All of these

The correct order of acidic nature among the following is -

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HClO₂< HClO₃< HClO₄
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H₃PO₄< H₃PO₃< H₃PO₂
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CH₄< NH₃< H₂O < HF
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All of the above.

Of the hydrides, $H_{2} O, H_{2} S e, a n d H_{2} T e$ , the one which has the smallest pK_a value is

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H₂O
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H₂S
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H₂Se
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H₂Te

The shape of $C l O_{3}^{-}$ is

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Tetrahedral
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Triangular planer
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Triangular pyramid
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Planer

Which reaction can not be used for the preparation of halogen acid

$(A) 2 K B r + H_{2} S O_{4} (c o n c .) \to K_{2} S O_{4} + 2 H B r (B) N a C l + H_{2} S O_{4} (c o n c .) \to N a H S O_{4} + H C l (C) N a H S O_{4} + N a C l \to N a_{2} S O_{4} + H C l (D) C a F_{2} + H_{2} S O_{4} (c o n c .) \to C a S O_{4} + 2 H F$

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1
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2
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3
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4

An element (X) forms compounds of the formula $X C l_{3}, X_{2} O_{5} a n d C a_{3} X_{2},$ but does not form X $C l_{5}$ . Which of the following is the element

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B
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Al
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N
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P

Oxygen does not form OF₆ because

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It has a small size
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There are no vacant d- orbitals available
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It has high ionization energy
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It has a large size

The molecule having the smallest bond angle is

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H₂O
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H₂S
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H₂Te
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H₂Se

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Practice Chemistry Quiz Questions and Answers

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Practice Chemistry Quiz Questions and Answers

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