The molecule having the smallest bond angle is

(A) H2O

(B) H2S

(C) H2Te

(D) H2Se

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In H3PO3

(A) Each hydrogen atom is attached to oxygen

(B) Two hydrogen atoms are attached to oxygen atoms

(C) One atom of H is attached to oxygen

(D) None is attached

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group 16,preparation and properties
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Strong oxidising agent and strong reducing agents are respectively

(A) F2, HI

(B) Cl2, HCl

(C) Br2,HBr

(D) I2, HF

Concept Questions :-

group 17 ,preparation and properties
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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

(A) H2O

(B) CO2

(C) H2O2

(D) NO

Concept Questions :-

group 16,preparation and properties
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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 

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group 16,preparation and properties
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Indicate for the CIF3 molecule, the shape and the type of hybridization (of the Cl-atom)

Concept Questions :-

group 17 ,preparation and properties
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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 

Concept Questions :-

group 15 ,preparation and properties
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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

Concept Questions :-

group 15 ,preparation and properties
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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.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false

Concept Questions :-

group 15 ,preparation and properties
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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.

  1. If both the assertion and the reason are true and the reason is a correct explanation of the assertion
  2. If both the assertion and reason are true but the reason is not a correct explanation of the assertion
  3. If the assertion is true but the reason is false
  4. If both the assertion and reason are false
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