Assertion : Most of the known noble gas compounds are those of xenon.
Reason : The ionisation enthalpy of xenon is very close to that of oxygen.
Assertion : ClF3 exists bul FCl3 does not.
Reason : FCl3 is not formesd due to greater steric hinderance by the larger Cl atoms.
Assertion : Among hydrides of the elements of group 16, water shows unusual physical properties.
Reason: Water shows unusual pysical properties due to hydrogen bonding between the water molecules.
Assertion : Fluorine is a stronger oxidising agent than chlorine.
Reason : Fluorine can displace chlorine from chlorides.
Assertion : In trimethyalamine (N(CH3)3), the nitrogen has a pyramidal geometry, wheres in trisilylamine (N(SiH3)3), it has a planer geometry.
Reason : In trimethylamine, nitrogen shows sp3 hybridization while in trisilyamine it shows sp2 hybridization.
The volume of 2M NaOH required to convert 12 grams of NaH2PO4 [M=120gm mol-1] into Na3PO4 is
(A) 20 ml
(B) 80 ml
(C) 100 ml
(D) 200 ml
In nitrogen family the H-M-H bond angle in the hybrides MH3 gradually becomes closer to 90o on going from N to Sb. This shows that gradually
(A) The basic strength of hybrides increases
(B) Almost pure p-orbitals are used for M-H bonding
(C) The bond energies of M-H bond increases
(D) The bond pairs of electrons becomes nearer to the central atom
Indicate for the CIF3 molecule, the shape and the type of hybridization (of the Cl-atom)
A yellow metallic powder is burnt in a stream of fluorine to obtain a colourless gas X which is thermally stable and chemically inert. Its molecule has octahedral geometry. Another colourless gas Y with same constituent atoms as that of X is obtained when sulphur dichloride is heated with sodium fluoride. Its molecule has triangular pyramidal structure X and Y are
(A) SF4 and S2F2
(B) SF6 and SF4
(C) NaF and NaCl
(D) SF4 and SF6
Oxide of a non-metal possesses the following characterstics.
(i) It is both a proton donor and proton acceptor
(ii) It is poor conductor of electricity
(iii) It reacts readily with basic and acidic oxides
(iv) It oxidises Fe at boiling point.
The oxide is