Description : Give reason for the following observation (L-III) (a)- The tendency for catenation decreases down the group in group 14 (b)- The decreasing stability of+3 oxidation state with increasing atomic no. in group 13. (c)- Molten aluminum bromide is a poor conductor of electricity.
Last Answer : Ans. -(a) it is due to decrease in bond dissociation energy which is due to increase in atomic size C-C > Si-Si >Ge-Ge>Sn-Sn>Pb-Pb. (b)- It is due to inert pair effect. (c)- Molten AlBr3 is poor conductor of electricity because it is covalent compound.
Description : The element having maximum tendency of catenation (catenation - Self linking prop- erty)?
Last Answer : Carbon
Description : Which element of Group 14 exhibits maximum tendency for catenation?
Last Answer : Ans. Carbon
Description : Name the element of group 14 which exhibits maximum tendency for catenation?
Last Answer : Ans –Carbon.
Description : Assertion: `p`-nitrophenol is a stronger acid than `o`-nitrophenol. Reason: Intramolecular hydrogen bonding makes the `o`-isomer weaker than the `p-`i
Last Answer : Assertion: `p`-nitrophenol is a stronger acid than `o`-nitrophenol. Reason: Intramolecular hydrogen bonding ... D. A is incorrect but R is correct
Description : Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. Reason: `O_(3)` molecule is a resonance hybrid.
Last Answer : Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. ... I is not correct and Statement-II is correct
Description : Assertion (A) Both rhombic and monoclinic sulphur exist as `S_(8)` but oxygen exists as `O_(2)`. Reason (R ) Oxygen forms `ppi-ppi` multiple bond due
Last Answer : Assertion (A) Both rhombic and monoclinic sulphur exist as `S_(8)` but oxygen exists as `O_ ... Statement-I is not correct and Statement-II is correct
Description : Thiols are alcohol analogs in which the oxygen has been replaced by sulfur (e.g., CH3SH). Given the fact that the S-H bond is less polar than the O-H bond, which of the following ... (c) Hydrogen bonding forces would be the same. (d) No comparison can be made without additional information
Last Answer : Hydrogen bonding forces are weaker in thiols.
Description : Catenation is a property of the carbon atom which describes its ability to (a) bond with other carbon atoms (b) form double and triple bonds (c) exist in plant and animal form (d) form bonds in its ground state
Last Answer : bond with other carbon atoms
Description : Assertion:- `SF_(6)` cannot be hydrolysed but `SF_(4)` can be. Reason:- Six F atoms in `SF_(6)` prevent the attack of `H_(2)O` on sulphur atom of `SF_
Last Answer : Assertion:- `SF_(6)` cannot be hydrolysed but `SF_(4)` can be. Reason:- Six F atoms in ` ... D. Statement-I is not correct and Statement-II is correct
Description : Assertion : Tibia is stronger and inner whereas fibula is the slander and outer bone of lower leg or shank. Reason : Tibia has a sharp crest in the sh
Last Answer : Assertion : Tibia is stronger and inner whereas fibula is the slander and outer bone of lower leg or ... . D. If both Assertion and Reason are false.
Description : The effects of World War-II upon education are noticeable in the form of strong tendency to Options: A) Make the schools stronger supports for national policy B) Improve the articulation between high ... college C) Reverse the trend toward increased technology training D) Answer 'A' and 'B' only
Last Answer : D) Answer 'A' and 'B' only
Description : Assertion :- Oxidation number of `S` in `HSO_(3)^(-)` is `+4`. Reason :- Sulphur is in different oxidation state in different compounds.
Last Answer : Assertion :- Oxidation number of `S` in `HSO_(3)^(-)` is `+4`. Reason :- Sulphur is in ... Reason is False. D. If both Assertion & Reason are False.
Description : Assertion: Reaction of `SO_(2)` and `H_(2)S` in the presence of `Fe_(2)O_(3)` catalyst gives elemental sulphur. Reason: `SO_(2)` is a reducing agent.
Last Answer : Assertion: Reaction of `SO_(2)` and `H_(2)S` in the presence of `Fe_(2)O_(3)` catalyst gives ... is False. D. If both Assertion & Reason are False.
Description : Which of the following VIA group element has maximum catenation capacity
Last Answer : Which of the following VIA group element has maximum catenation capacity A. S B. O C. Se D. Te
Description : Define the Phenomenon catenation. Which element has maximum Catenation ability ?
Last Answer : Carbon has maximum catenation ability. The self-linkage of the atoms of elements to produce long chains is called catenation.
Description : what do you mean by Catenation? Why does ‘C’ show the property of catenation to maximum extent?
Last Answer : Ans. It is the phenomenon of an atom to form a strong covalent bond with the atom of itself .Carbon shares the property of catenation to maximum extent because it is small and can form multiple bond to itself.
Description : Electron affinity order of chalcogens is
Last Answer : Electron affinity order of chalcogens is A. `SgtSegtTegtO` B. `OgtSgtSegtTegtPo` C. `SgtOgtSegtTegtPo` D. `PgtPogtTegtSegtS`
Description : Which of the following sets of atomic numbers belongs to chalcogens
Last Answer : Which of the following sets of atomic numbers belongs to chalcogens A. 8,52,84 B. 9,17,35 C. 20,37,56 D. 14,32,50
Description : In p block elements which group is known as halogens and chalcogens?
Last Answer : Ans: 17 =halogen 16=chalcogens
Description : Assertion :-`CO_(2)` molecules is non-polar while `SO_(2)` Reason : - Carbon atom is smaller than sulphur.
Last Answer : Assertion :-`CO_(2)` molecules is non-polar while `SO_(2)` Reason : - Carbon atom is smaller ... is False. D. If both Assertion & Reason are false
Description : Asserton :- The formal oxidation no. of sulphur in `Na_(2)S_(4)O_(6)` is `2.5` Reason :- Two S-atoms are not directly linked with O-atoms.
Last Answer : Asserton :- The formal oxidation no. of sulphur in `Na_(2)S_(4)O_(6)` is `2.5` Reason :- ... Reason is False. D. If both Assertion & Reason are False.
Description : Assertion :- Bond Dissociation energy is `F_(2) gt Cl_(2)` Reason:- `Cl_(2)` have more electronic repulsion than `F_(2)`.
Last Answer : Assertion :- Bond Dissociation energy is `F_(2) gt Cl_(2)` Reason:- `Cl_(2)` have more ... is False. D. If both Assertion & Reason are false
Description : Assertion: Bond angle at oxygen in ethehers is greater than ideal tetrahedral angle Reason: Stearic hindrance between alkyl groups increase bond angle
Last Answer : Assertion: Bond angle at oxygen in ethehers is greater than ideal tetrahedral angle Reason: Stearic ... D. Assertion is false, Reason is true
Description : Assertion (A): Alkyl aryl ethers on reaction with HI give alkyl iodide phenols Reason (R): Aryl - oxygen bond is weaker than alkyl oxygen bond
Last Answer : Assertion (A): Alkyl aryl ethers on reaction with HI give alkyl iodide phenols Reason (R): Aryl - oxygen ... is false D. A is false but R is true
Description : Assertion :- At constant temp `0^(@)C` and 1 atm, the change `H_(2)O(s)rarr H_(2)O(l)Delta H` and `Delta E` both are zero. Reason :- During isothermal
Last Answer : Assertion :- At constant temp `0^(@)C` and 1 atm, the change `H_(2)O(s)rarr H_(2)O(l) ... Reason is False. D. If both Assertion & Reason are false.
Description : Assertion :- At constant pressure for the change `H_(2)O(s)rarr H_(2)O(g)` work done is nwgative. Reason :- During phase transition work done is alway
Last Answer : Assertion :- At constant pressure for the change `H_(2)O(s)rarr H_(2)O(g)` work done is ... is False. D. If both Assertion & Reason are false.
Description : Single bond between sulphur atoms is pressent in
Last Answer : Single bond between sulphur atoms is pressent in A. `H_(2)S_(2)O_(7)` B. `H_(2)S_(2)O_(8)` C. `H_(2)S_(2)O_(6)` D. `H_(2)S_(2)O_(3)`
Description : Performance number of a liquid fuel is related to its (A) Wax content (B) Spontaneous ignition temperature (C) Knocking tendency (D) Sulphur content
Last Answer : (B) Spontaneous ignition temperature
Description : How many S - O single bond linkages are present in peroxodisulphuric acid?
Last Answer : How many S - O single bond linkages are present in peroxodisulphuric acid?
Description : Assertion `:` Removal of gall bladder does affect the protein digestion. Reason `:` Bile juice break the peptide bond.
Last Answer : Assertion `:` Removal of gall bladder does affect the protein digestion. Reason `:` Bile juice break ... . D. If both Assertion & Reason are false.
Description : Assertion `:` Pancreatic amylase digest protein to amino acid. Reason `:` Pancreatic amylase breaks the peptide bond of protein.
Last Answer : Assertion `:` Pancreatic amylase digest protein to amino acid. Reason `:` Pancreatic amylase breaks the ... D. If both Assertion & Reason are false.
Description : Assertion : In aDNA molecule, A-T rich parts melt before G-C rich parts. Reason : In between A and T there are three H-bond, whereas in between G and
Last Answer : Assertion : In aDNA molecule, A-T rich parts melt before G-C rich parts. Reason : In between A ... false. D. If both assertion and reason are false.
Description : Assertion :- Bond order of `O_(2)` and BN is same . Reason `O_(2) and BN` are isoelectronic
Last Answer : Assertion :- Bond order of `O_(2)` and BN is same . Reason `O_(2) and BN` are isoelectronic ... is False. D. If both Assertion & Reason are false
Description : Is an ionic bond stronger than a covalent bond?
Last Answer : Covalent bond is made up of electrostatic attraction but ionic bond is made up of weak waalander's force of attraction
Description : Is a covalent bond stronger than a hydrogen bond?
Last Answer : A hydrogen bond is weaker than a covalent bond.
Description : Pick up the correct statement from the following: (A) Illite bond is weaker than Kaolinite bond (B) Illite bond is stronger than montmorillonite bond (C) Illite does not swell when wet (D) All the above
Last Answer : Answer: Option D
Description : The bond most likely to be formed when two atoms differ SOMEWHAT in their tendency to attract electrons is: w) nonpolar ionic x) polar ionic y) polar covalent z) nonpolar covalent
Last Answer : ANSWER: Y -- POLAR COVALENT
Description : What is meant by catenation?
Last Answer : The unique ability of carbon to form bonds with other atoms of carbon is called catenation.
Description : The property of catenation is predominant in
Description : Which brief statement most accurately describes why alkenes react the way they do? (a) C=C double bonds are weak. (b) A π bond is lost but a stronger σ bond is gained. (c) C=C double bonds are unstable. (d) C=C π bonds are attacked by nucleophiles.
Last Answer : A π bond is lost but a stronger σ bond is gained.
Description : As compared to English bond, double Flemish bond is (A) Stronger (B) More compact (C) Costly (D) None of these
Last Answer : Answer: Option B
Description : Assertion : o-Hydrozybenaldehyde is less soluable in water than p-Hydroxybenzalbenzaldehye. Reason : Intra molecular hydrogen bonding in o-Hydrozbenza
Last Answer : Assertion : o-Hydrozybenaldehyde is less soluable in water than p-Hydroxybenzalbenzaldehye. Reason : Intra ... D. Assertion is false, Reason is true
Description : The tendency for complex formation is maximum in (a) s-block elements (b) p-block elements (c) noble gases (d) d-block elements
Last Answer : Ans:(d)
Description : Assertion: Western Ghats are included among the hot spots of biodiversity. Reason: Western Ghats have greater amphibian diversity than Eastern Ghats
Last Answer : Assertion: Western Ghats are included among the hot spots of biodiversity. Reason: Western Ghats have greater ... and Reason are false, then mark (4).
Description : Consider the following statements, I. S-S bond is present in `H_(2)S_(2)O_(6).` II. In peroxodisulphuric acid `(H_(2)S_(2)O_(8))`, sulphur is in `+6`
Last Answer : Consider the following statements, I. S-S bond is present in `H_(2)S_(2)O_(6).` II. In ... in `+6` oxidation state. The correct set of statement is
Description : Among the following metal carbonyls , the C-O bond order is lowest in :
Last Answer : Among the following metal carbonyls , the C-O bond order is lowest in : A. `[Mn(CO)_(6)]^(+)` B. `[V(CO)_(6)]^(-)` C. `[Cr(CO)_(6)]` D. `[Fe(CO)_(5)]`
Description : Among the following , metal carbonyls, the C-O bond is strongest :
Last Answer : Among the following , metal carbonyls, the C-O bond is strongest : A. `[Mn(CO)_(6)]^(+)` B. `[Cr(CO)_(6)]` C. `[V(CO)_(6)]^(-)` D. `[Ti(CO)_(6)]^(2-)`