The major product formed in the following reaction is:
Question: The major product formed in the following reaction is: Correct Option: , 2 Solution:...
Read More →The major product of the following reaction is :
Question: The major product of the following reaction is : Correct Option: , 3 Solution:...
Read More →Sulphide ion is soft base
Question: Sulphide ion is soft base and its ores are common for metals. (a) $\mathrm{Pb}$ (b) Al (c) $\mathrm{Ag}$ (d) $\mathrm{Mg}$ Choose the correct answer from the options given below:(a) and (c) only(a) and $(d)$ only(a) and (b) only(c) and (d) onlyCorrect Option: 1, Solution: $\mathrm{Pb}$ and Ag commonly exist in the form of sulphide ore like $\mathrm{PbS}$ (galena) and $\mathrm{Ag}_{2} \mathrm{~S}$ (Argentite) 'Al' is mainly found in the form of oxide ore whereas 'Mg' is found in the for...
Read More →Given below are two statements : one is labelled as
Question: Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of $\mathrm{Al}_{2} \mathrm{O}_{3}$ with cryolite. Reason (R) : The oxidation state of Al in cryolite is $+3$. In the light of the above statements, choose the most appropriate answer from the options given below:(A) is true but (R) is false(A) is false but $(\mathbf{R})$ is true.Both (A) and ...
Read More →Thiamine and pyridoxine
Question: Thiamine and pyridoxine are also known respectively as :Vitamin $\mathrm{B}_{2}$ and Vitamin $\mathrm{E}$Vitamin $\mathrm{E}$ and Vitamin $\mathrm{B}_{2}$Vitamin $\mathrm{B}_{6}$ and Vitamin $\mathrm{B}_{2}$Vitamin $\mathrm{B}_{1}$ and Vitamin $\mathrm{B}_{6}$Correct Option: , 4 Solution: Vitamine- $B_{1}$ is also known as Thiamine while vitamin B-6 is known as Pyridoxine...
Read More →The set having ions
Question: The set having ions which are coloured and paramagnetic both is -$\mathrm{Cu}^{2+}, \mathrm{Cr}^{3+}, \mathrm{Sc}^{+}$$\mathrm{Cu}^{2+}, \mathrm{Zn}^{2+}, \mathrm{Mn}^{4+}$$\mathrm{Sc}^{3+}, \mathrm{V}^{5+}, \mathrm{Ti}^{4+}$$\mathrm{Ni}^{2+}, \mathrm{Mn}^{7+}, \mathrm{Hg}^{2+}$Correct Option: 1 Solution: $\left.\begin{array}{l}\mathrm{Cu}^{2+}:[\mathrm{Ar}] 3 \mathrm{~d}^{9} 4 \mathrm{~s}^{0} \\ \mathrm{Cr}^{3+}:[\mathrm{Ar}] 3 \mathrm{~d}^{3} 4 \mathrm{~s}^{0} \\ \mathrm{Sc}^{+}:[\ma...
Read More →Prove the following
Question: Consider the above reaction and identify the Product P :Correct Option: , 4 Solution:...
Read More →Match List-I with List-II :
Question: Match List-I with List-II : Choose the correct answer from the options given below :(a) - (iii), (b)-(iv), (c) -(ii), (d) -(i)(a) - (ii), (b)-(iii), (c) -(iv), (d) -(i)$(\mathrm{a})-(\mathrm{ii}),(\mathrm{b})-(\mathrm{i}),(\mathrm{c})-(\mathrm{iv}),(\mathrm{d})-(\mathrm{iii})$(a) - (iii), (b)-(i), (c) -(iv), (d) -(ii)Correct Option: , 2 Solution:...
Read More →solve this
Question: The correct statement about (A), (B), (C) and (D) is :(A), (B) and (C) are narcotic analgesics(B), (C) and (D) are tranquillizers(A) and (D) are tranquillizers(B) and (C) are tranquillizersCorrect Option: , 4 Solution: B and C are tranquilizers...
Read More →Which one of the following lanthanides exhibits
Question: Which one of the following lanthanides exhibits $+2$ oxidation state with diamagnetic nature? $($ Given $\mathrm{Z}$ for $\mathrm{Nd}=60, \mathrm{Yb}=70, \mathrm{La}=57, \mathrm{Ce}=58)$$\mathrm{Nd}$$\mathrm{Yb}$La$\mathrm{Ce}$Correct Option: , 2 Solution: Ytterbium shows $+2$ oxidation state with diamagnetic nature So ans is 2...
Read More →Which one of the following group-
Question: Which one of the following group-15 hydride is the strongest reducing agent?$\mathrm{AsH}_{3}$$\mathrm{BiH}_{3}$$\mathrm{PH}_{3}$$\mathrm{SbH}_{3}$Correct Option: , 2 Solution: Among $15^{\text {th }}$ group hydrides, $\mathrm{BiH}_{3}$ is strongest reducing agent....
Read More →The statement that is INCORRECT
Question: The statement that is INCORRECT about Ellingham diagram is provides idea about the reaction rate.provides idea about free energy change.provides idea about changes in the phases during the reaction.provides idea about reduction of metal oxide.Correct Option: 1 Solution: Ellingham diagram is a plot between $\Delta \mathrm{G}^{\circ}$ and $\mathrm{T}$ and does not give any information regarding rate of reaction...
Read More →Given below are the statements about diborane
Question: Given below are the statements about diborane (a) Diborane is prepared by the oxidation of $\mathrm{NaBH}_{4}$ with $\mathrm{I}_{2}$ (b) Each boron atom is in $\mathrm{sp}^{2}$ 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 -(c) and (d) only(a) only(c) only(a) and (b) onlyCorrect Option: , 2 Solution: Diborane is prepared by the reaction of $\mathrm{NaBH}_{4}$ with $\mathrm{I}_{2}$. $2 \ma...
Read More →Match List-I with List-II :
Question: Match List-I with List-II : Choose the most appropriate match :(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)Correct Option: , 4 Solution: $\rightarrow$ furacine acts as Antiseptic $\rightarrow$ Arsphenamine also known as salvarsan acts as antibiotic $\rightarrow$ Dimetone is synthetic histamine $\rightarrow$ valium is a Tranqulizer...
Read More →Match items of List-I with those of List-II :
Question: Match items of List-I with those of List-II : Choose the most appropriate answer from the options given below:(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)(a)-(i), (b)-(iii), (c)-(iv), (d)-(ii)(a)-(iii), (b)-(iv), (c)-(ii), (d)-(i)(a)-(iv), (b)-(ii), (c)-(i), (d)-(iii)Correct Option: , 3 Solution: 3...
Read More →Which of the following molecules
Question: Which of the following molecules does not show stereo isomerism ?3,4 -Dimethylhex-3-ene3-Methylhex-1-ene3 -Ethylhex-3-ene4-Methylhex-1-eneCorrect Option: , 3 Solution: 3-Ethylhex-3-ene will not show stereo isomerism it's diagram is....
Read More →Which one among the following chemical tests
Question: Which one among the following chemical tests is used to distinguish monosaccharide from disaccharide?Seliwanoff's testIodine testBarfoed testTollen's testCorrect Option: , 3 Solution: Barford test is used for distinguish monosaccharide from disaccharide...
Read More →When silver nitrate solution
Question: When silver nitrate solution is added to potassium iodide solution then the sol produced is :$\mathrm{AgI} / \mathrm{I}$$\mathrm{AgI} / \mathrm{Ag}^{+}$$\mathrm{KI} / \mathrm{NO}_{3}^{-}$$\mathrm{AgNO}_{3} / \mathrm{NO}_{3}^{-}$Correct Option: 1 Solution: $\underset{\text { (drop by drop) }}{\mathrm{Ag} \mathrm{NO}_{3} \text { (aq.) }}+\underset{\text { excess }}{\mathrm{KI} \text { (aq.) }} \longrightarrow \underset{\text { Sol }}{\mathrm{AgI} / \mathrm{I}^{-}}$...
Read More →Which refining process is generally used in the purification of low melting metals ?
Question: Which refining process is generally used in the purification of low melting metals ?Chromatographic methodLiquationElectrolysisZone refiningCorrect Option: , 2 Solution: Liquation method is used to purify those impure metals which has lower melting point than the melting point of impurities associated. This method is used for metal having low melting point....
Read More →The major products
Question: The major products $A$ and $B$ in the following set of reactions are: Correct Option: , 3 Solution:...
Read More →Presence of which reagent will affect the reversibility
Question: Presence of which reagent will affect the reversibility of the following reaction, and change it to a irreversible reaction : $\mathrm{HOCl}$dilute $\mathrm{HNO}_{2}$Liquid $\mathrm{NH}_{3}$Concentrated $\mathrm{HIO}_{3}$Correct Option: , 4 Solution: lodination of alkane is reversible reaction. It can be irreversible in the presence of strong oxidising agent like conc. $\mathrm{HNO}_{3}$ or conc. $\mathrm{HIO}_{3}$...
Read More →Deuterium resembles hydrogen in properties but :
Question: Deuterium resembles hydrogen in properties but :reacts slower than hydrogenreacts vigorously than hydrogenreacts just as hydrogenemits $\beta^{+}$particlesCorrect Option: 1 Solution: The bond dissociation energy of $\mathrm{D}_{2}$ is greater than $\mathrm{H}_{2}$ and therefore $\mathrm{D}_{2}$ reacts slower than $\mathrm{H}_{2}$....
Read More →Match List-I with List-II :
Question: Match List-I with List-II : Choose the correct answer from the options given below :(a)-(i), (b)-( ii), (c)-(v) and (d)-(iii)$(\mathrm{a})-(\mathrm{ii}),(\mathrm{b})-(\mathrm{i}),(\mathrm{c})-(\mathrm{iv})$ and $(\mathrm{d})-(\mathrm{v})$(a)-(iii), (b)-(i), (c)-(v) and (d)-(iv)(a)-(iv), (b)-(iii), (c)-(ii) and (d)-(v)Correct Option: , 3 Solution: (a) $\mathrm{SF}_{4}-\mathrm{sp}^{3} \mathrm{~d}$ hybridisation (b) $\mathrm{IF}_{5}-\mathrm{sp}^{3} \mathrm{~d}^{2}$ hybridisation (c) $\mat...
Read More →Given below are two statements :
Question: Given below are two statements : Statement I : Rutherford's gold foil experiment cannot explain the line spectrum of hydrogen atom. Statement II : Bohr's model of hydrogen atom contradicts Heisenberg's uncertainty principle. In the light of the above statements, choose the most appropriate answer from the options given below :Statement I is false but statement II is true.Statement I is true but statement II is false.Both statement I and statement II are false.Both statement I and state...
Read More →In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?
Question: In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected?$\mathrm{BCl}_{3}$$\mathrm{BF}_{3}$$\mathrm{BBr}_{3}$$\mathrm{BI}_{3}$Correct Option: , 2 Solution: Type of back bonding $\mathrm{BF}_{3}$ $\begin{array}{lll}\mathrm{BCl} \mathrm{BBr}_{3} \mathrm{BI}_{3}\end{array}$ Therefore back bonding strength is as follows $\mathrm{BF}_{3}\mathrm{BCl}\mathrm{BBr}_{3}\mathrm{BI}_{3}$...
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