Practice Questions

Q33.Which of the following compound CANNOT act as a Lewis base? (1) NF3 (2) PCl5 (3) SF4 (4) ClF3

Q34.Match List- I with List- II. List- I List- II (Molecule) (Bond order) (a) Ne2 (i) 1 (b) N2 (ii) 2 (c) F2 (iii) 0 (d) O2 (iv) 3 Choose the correct answer from the options given below: (1) (a) →(ii), (b) →(i), (c) →(iv), (d) →(iii) (2) (a) →(iii), (b) →(iv), (c) →(i), (d) →(ii) (3) (a) →(i), (b) →(ii), (c) →(iii), (d) →(iv) (4) (a) →(iv), (b) →(iii), (c) →(ii), (d) →(i)

Q34.A solution is 0. 1M in Cl− and 0. 001M in CrO2−4 . Solid AgNO3 is gradually added to it Assuming that the addition does not change in volume and Ksp(AgCl) = 1. 7 × 10−10M2 and Ksp(Ag2 CrO4) = 1. 9 × 10−12M3. Select correct statement from the following: (1) AgCl precipitates first because its Ksp is high. (2) Ag2 CrO4 precipitates first as its Ksp is low. (3) Ag2 CrO4 precipitates first because the amount of Ag+ needed is low. (4) AgCl will precipitate first as the amount of Ag+ needed to precipitate is low.

Q34.The exact volumes of 1 M NaOH solution required to neutralise 50 mL of 1 M H3 PO3 solution and 100 mL of 2 M H3 PO2 solution, respectively, are : (1) 100 mLand 100 mL (2) 100 mL and 50 mL (3) 100 mL and 200 mL (4) 50 mL and 50 mL

Q34.Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A : Dipole-dipole interactions are the only non-covalent interactions, resulting in hydrogen bond formation. Reason R : Fluorine is the most electronegative element and hydrogen bonds in HF are symmetrical. In the light of the above statements, choose the most appropriate answer from the options given below: (1) A is false but R is true (2) Both A and R are true but R is NOT the correct explanation of A (3) A is true but R is false (4) Both A and R are true and R is the correct explanation of A

Q34.Match List - I with List II : List-I List-II a Li i photoelectric cell b Na ii absorbent of CO2 c K iii coolant in fast breeder nuclear reactor d Cs iv treatment of cancer v bearings for motor engines Choose the correct answer from the options given below: (1) (a ) -( v ),( b )-( i ),( c )-( ii ),( d )-( iv) (2) (a ) -( v ),( b )-( ii ),( c )-( iv ),( d )-( i) (3) (a ) - ( iv ), ( b ) - ( iii ), ( c ) - ( i ), ( d ) - ( ii) (4) (a ) - ( v ), ( b ) - ( iii ), ( c ) - ( ii ), ( d ) - ( i)

Q34.Given below are two statements: Statement I : Both CaCl2. 6H2O and MgCl2. 8H2O undergo dehydration on heating. Statement II : BeO is amphoteric, whereas the oxides of other elements in the same group are acidic. In the light of the above statements, choose the correct answer from the options given below: (1) Statement I is false but statement II is true (2) Both statement I and statement II are false (3) Both statement I and statement II are true (4) Statement I is true but statement II is false

Q34.Which of the following compound is added to the sodium extract before addition of silver nitrate for testing of halogens? (1) Nitric acid (2) Sodium hydroxide (3) Ammonia (4) Hydrochloric acid

Q34.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Heavy water is used for the study of reaction mechanism. Reason (R): The rate of reaction for the cleavage of O −H bond is slower than that of O −D bond. Choose the most appropriate answer from the options given below : (1) Both (A) and (R) are true and (R) is the true (2) (A) is true but (R) is false. explanation of (A) . (3) (A) is false but (R) is true. (4) Both (A) and (R) are true but (R) is not the true explanation of (A).

Q34.Given below are two statements : One is labelled as Assertion A and other is labelled as Reason R. Assertion A : The dihedral angles in H2O2 in gaseous phase is 90. 2° and in solid phase is 111. 5° . Reason R : The change in dihedral angle in solid and gaseous phase is due to the difference in the intermolecular forces. Choose the most appropriate answer from the options given below for A and R. (1) A is correct but R is not correct. (2) Both A and R are correct but R is not the correct explanation of A. (3) Both A and R are correct and R is the correct (4) A is not correct but R is correct. explanation of A .

Q34.Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Lithium salts are hydrated. Reason (R) : Lithium has higher polarising power than other alkali metal group members. In the light of the above statements, choose the most appropriate answer from the options given below : (1) (A) is not correct but (R) is correct. (2) (A) is correct but (R) is not correct. (3) Both (A) and (R) are correct but (R) is NOT the (4) Both (A) and (R) are correct and (R) is the correct explanation of (A). correct explanation of (A).

Q34.The INCORRECT statement(s) about heavy water is (are) (A) used as a moderator in nuclear reactor (B) obtained as a by-product in fertilizer industry. (C) used for the study of reaction mechanism (D) has a higher dielectric constant than water Choose the correct answer from the options given below: (1) (B) only (2) (C) only (3) (D) only (4) (B) and (D) only

Q34.Choose the correct statement from the following : (1) LiF has least negative standard enthalpy of (2) The standard enthalpy of formation for alkali formation among alkali metal fluorides. metal bromides becomes less negative on descending the group. (3) The low solubility of CsI in water is due to its (4) Among the alkali metal halides, LiF is least high lattice enthalpy. soluble in water.

Q34.Which one of the following compounds of Group-14 elements is not known? (1) GeCl6 2 - (2) SnOH6 2 - (3) SiCl6 2 - (4) SiF6 2 -

Q34.In basic medium, H2O2 exhibits which of the following reactions? (A) Mn2+ →Mn4+ (B) I2 →I− (C) PbS →PbSO4 Choose the most appropriate answer from the options given below : (1) (A),(C) only (2) (A) only (3) (B) only (4) (A), (B) only

Q34.Identify the species having one π -bond and maximum number of canonical forms from the following : (1) SO3 (2) O2 (3) SO2 (4) CO2−3

Q34.Given below are the statements about diborane (a) Diborane is prepared by the oxidation of NaBH4 with I2 (b) Each boron atom is in sp2 hybridized state (c) Diborane has one bridged 3 centre- 2 -electron bond (d) Diborane is a planar molecule The option with correct statement(s) is (1) (c) and (d) only (2) (a) only (3) (c) only (4) (a) and (b) only

Q34.Which one of the following compounds is aromatic in nature? (1) (2) (3) Both A and B (4)

Q34.Al2O3 was leached with alkali to get X . The solution of X on passing of gas Y, forms Z . X, Y and Z respectively are (1) X = AlOH3, Y = CO2', Z = Al2O3 (2) 𝑋= NaAlOH4, Y = SO2, Z = Al2O3 (3) X = AlOH3, Y = SO2, Z = Al2O3 · xH2O (4) 𝑋= NaAlOH4, Y = CO2, Z = Al2O3, 𝑥H2O

Q35.Calgon is used for water treatment. Which of the following statement is NOT true about Calgon? (1) It is polymeric compound and is water soluble. (2) Calgon contains the 2nd most abundant element by weight in the Earth's crust. (3) It is also known as Graham's salt. (4) It doesnot remove Ca2+ ion by precipitation.

Q35.In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected? (1) BI3 (2) BBr3 (3) BCl3 (4) BF3

Q35.Identify products A and B . (1) (2) (3) (4)

Q35.Which one of the following set of elements can be detected using sodium fusion extract? (1) Sulfur, Nitrogen, Phosphorus, Halogens (2) Phosphorus, Oxygen, Nitrogen, Halogens (3) Nitrogen, Phosphorus, Carbon, Sulfur (4) Halogens, Nitrogen, Oxygen, Sulfur

Q35.Statements about heavy water are given below. A. Heavy water is used in exchange reactions for the study of reaction mechanisms. B. Heavy water is prepared by exhaustive electrolysis of water. C. Heavy water has higher boiling point than ordinary water. D. Viscosity of H2O is greater than D2O. Choose the most appropriate answer from the options given below: (1) A and C only (2) A, B and C only (3) A and B only (4) A and D only

Q35. Cu2+ salt reacts with potassium iodide to give (1) Cu2 I2 (2) Cu2 I3 (3) Cul (4) Cu (I3)2