991.

Which gas behaves abnormally when liquified?

• Xenon

• Krypton

• Helium

• Argon

Which statement is false for white phosphorus (P₄)?

• It has six P-P single bonds

• It has four P-P single bonds

• It has four lone pairs of electrons

• It has PPP angle 60°

Match List I (species) with List II (hybridization) and select the correct code given below

• A    B    C    D

  (iii) (ii)  (iv) (i)

• A    B    C    D

  (i)  (iv) (ii)  (iii)

• A    B    C    D

  (iii) (iv) (ii)  (i)

• A    B    C    D

  (i)  (ii)  (iv) (iii)

Which of the following statment is true?

• SnCl₄ is more stable than SnCl₂

• PbCl₂ is more stable than PbCl₄

• GeCl_4, is more stable than GeCl₂

• TICl₃ is more stable than TICl

Microcosmic salt when heated strongly, a transparent bead is formed which is used in the identification of

• ZnO

• Al₂O₃

• MgO

• SiO₂

Chlorine is least reactive in

• methyl chloride

• ethyl chloride

• vinyl chloride

• allyl chloride

Which of the following compounds gives metal on heating?

• AgNO₃

• Ca(NO₃)₂

• Ni(NO₃)₂

• Pb(NO₃)₂

Which of the following compound liberate Cl₂ gas when react with I₂ ?

• Potassium permanganate

• Potassium chlorate

• Hypo

• Potassium dichromate

Which of the following reactions give oxygen gas?

$$\begin{gathered} 1. {\mathrm{KMnO}}_4 + 2\mathrm{KF} + {\mathrm{H}}_2{\mathrm{O}}_2 \stackrel{50\% \mathrm{HF}}{\to } \\ 2. {\mathrm{F}}_2 + \mathrm{NaOH} \to \\ 3. {\mathrm{XeF}}_2 + 2{\mathrm{H}}_2\mathrm{O} \to \\ 4. {\mathrm{Hg}}_2{\mathrm{CrO}}_4\to \end{gathered}$$

• 1,2, 3

• 1,3, 4

• 2, 3, 4

• 1,2, 4

Neon atom requires energy to remove one electron from its outermost orbit, so also to add one electron into the outermost orbit.

Which of the following is correct about fluorine?

I. Fluorine releases energy when an electron is removed.

II. Fluorine requires energy to add one electron.

• (I) and (II) are correct

• (I) is correct, (II) is false

• (I) is false, (II) is correct 

• (I) and (II) are false