To an aqueous solution containing ions such
Question: To an aqueous solution containing ions such as $\mathrm{Al}^{3+}, \mathrm{Zn}^{2+}, \mathrm{Ca}^{2+}, \mathrm{Fe}^{3+}, \mathrm{Ni}^{2+}, \mathrm{Ba}^{2+}$ and $\mathrm{Cu}^{2+}$ was added conc. $\mathrm{HCl}$, followed by $\mathrm{H}_{2} \mathrm{~S}$. The total number of cations precipitated during this reaction is/are :1342Correct Option: 1 Solution: $\mathrm{Al}^{3+}$ and $\mathrm{Fe}^{3+}$ sulphides hydrolyse in water. $\mathrm{Ni}^{2+}$ and $\mathrm{Zn}^{2+}$ require basic medium ...
Read More →A s-block element (M) reacts with oxygen to form an oxide
Question: A s-block element (M) reacts with oxygen to form an oxide of the formula $\mathrm{MO}_{2}$. The oxide is pale yellow in colour and paramagnetic. The element (M) is:$\mathrm{Mg}$$\mathrm{Na}$$\mathrm{Ca}$$\mathrm{K}$Correct Option: , 4 Solution: (A) $2 \mathrm{Mg}+\mathrm{O}_{2} \rightarrow 2 \mathrm{MgO}$ (Diamagnetic) (B) $2 \mathrm{Na}+\mathrm{O}_{2} \rightarrow \mathrm{Na}_{2} \mathrm{O}$ (Diamagnetic) $2 \mathrm{Na}+\underset{\text { (excess) }}{\mathrm{O}_{2}} \rightarrow \mathrm{...
Read More →Which one of the following compounds
Question: Which one of the following compounds will liberate $\mathrm{CO}_{2}$, when treated with $\mathrm{NaHCO}_{3}$ ?$\mathrm{CH}_{3} \mathrm{NH}_{2}$Correct Option: 1 Solution:...
Read More →When 10 mL of an aqueous solution of KMnO4 was titrated in acidic medium, equal volume of 0.1 M
Question: When $10 \mathrm{~mL}$ of an aqueous solution of $\mathrm{KMnO}_{4}$ was titrated in acidic medium, equal volume of $0.1$ $\mathrm{M}$ of an aqueous solution of ferrous sulphate was required for complete discharge of colour. The strength of $\mathrm{KMnO}_{4}$ in grams per litre is__________________ $\times 10^{-2}$. (Nearest integer) [Atomic mass of $\mathrm{K}=39, \mathrm{Mn}=55, \mathrm{O}=16$ ] Solution: Let molarity of $\mathrm{KMnO}_{4}=\mathrm{x}$ $\mathrm{KMnO}_{4}+\mathrm{FeSO...
Read More →Which one of the following chemical agent
Question: Which one of the following chemical agent is not being used for dry-cleaning of clothes?$\mathrm{H}_{2} \mathrm{O}_{2}$$\mathrm{CCl}_{4}$Liquid $\mathrm{CO}_{2}$$\mathrm{Cl}_{2} \mathrm{C}=\mathrm{CCl}_{2}$Correct Option: 1 Solution: $\mathrm{CO}_{2}, \mathrm{CCl}_{4}$ and $\mathrm{Cl}_{2} \mathrm{C}=\mathrm{CCl}_{2}$ are used as dry cleaning agents for clothes. $\mathrm{H}_{2} \mathrm{O}_{2}$ is used as bleaching agent in laundry....
Read More →Given below are two statements :
Question: Given below are two statements : Statement I : $\left[\mathrm{Mn}(\mathrm{CN})_{6}\right]^{3-},\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$ and $\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$ are d $^{2} \mathrm{sp}^{3}$ hybridised. Statement II : $\left[\mathrm{MnCl}_{6}\right]^{3-}$ and $\left[\mathrm{FeF}_{6}\right]^{3-}$ are paramagnetic and have 4 and 5 unpaired electrons, respectively. In the light of the above statements, choose the correct answe...
Read More →The structure of product
Question: The structure of product $C$, formed by the following sequence of reactions is : Correct Option: 1 Solution:...
Read More →Solve This
Question: Among the given species the Resonance stabilised carbocations are:(C) and (D) only(A), (B) and (D) only(A) and (B) only(A), (B) and (C) onlyCorrect Option: , 3 Solution: (A) and (B) only in Resonance...
Read More →The correct order of following
Question: The correct order of following $3 \mathrm{~d}$ metal oxides, according to their oxidation numbers is : (a) $\mathrm{CrO}_{3}$ (b) $\mathrm{Fe}_{2} \mathrm{O}_{3}$ (c) $\mathrm{MnO}_{2}$ (d) $\mathrm{V}_{2} \mathrm{O}_{5}$ (e) $\mathrm{Cu}_{2} \mathrm{O}$$(\mathrm{d})(\mathrm{a})(\mathrm{b})(\mathrm{c})(\mathrm{e})$$(\mathrm{a})(\mathrm{c})(\mathrm{d})(\mathrm{b})(\mathrm{e})$$(\mathrm{a})(\mathrm{d})(\mathrm{c})(\mathrm{b})(\mathrm{e})$$(\mathrm{c})(\mathrm{a})(\mathrm{d})(\mathrm{e})(...
Read More →Given below are two statements :
Question: Given below are two statements : Statement I : Hyperconjugation is a permanent effect. Statement II : Hyperconjugation in ethyl cation $\left(\mathrm{CH}_{3}-\stackrel{+}{\mathrm{CH}_{2}}\right)$ involves the overlapping of $\mathrm{C}_{s p^{2}}-\mathrm{H}_{1 s}$ bond with empty $2 \mathrm{p}$ orbital of other carbon. Choose the correct option :Both statement I and statement II are falseStatement I is incorrect but statement II is trueStatement I is correct but statement II is falsBoth...
Read More →The number of moles of NH3 , that must be added to 2 L of 0.80 M AgNO3
Question: The number of moles of $\mathrm{NH}_{3}$, that must be added to $2 \mathrm{~L}$ of $0.80 \mathrm{M} \mathrm{AgNO}_{3}$ in order to reduce the concentration of $\mathrm{Ag}^{+}$ions to $5.0 \times 10^{-8} \mathrm{M}\left(\mathrm{K}_{\text {formation }}\right.$ for $\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}=1.0 \times 10^{8}$ ) is - (Nearest integer) [Assume no volume change on adding $\mathrm{NH}_{3}$ ] Solution: Let moles added $=\mathrm{a}$ $\mathrm{Ag}_{\text {(aq....
Read More →Given below are two statements :
Question: Given below are two statements : Statement I : None of the alkaline earth metal hydroxides dissolve in alkali. Sratement II : Solubility of alkaline earth metal hydroxides in water increases down the group. In the light of the above statements, choose the most appropriate answer from the options given below :Statement I is correct but Statement II is incorrect.Statement I is incorrect but Statement II is correct.Statement I and Statement II both are incorrect.Statement I and Statement ...
Read More →BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively :
Question: BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively :$\mathrm{A}50, \mathrm{~B}27$$A25, B17$$A5, B17$$\mathrm{A}15, \mathrm{~B}47$Correct Option: , 3 Solution: BOD values of clean water (A) is less than $5 \mathrm{ppm}$ So $A5$ BOD values of polluted water (B is greater than 17 ppm So $\mathrm{B}17$ So Ans. is 3...
Read More →An inorganic Compound 'X' on treatment with concentrated
Question: An inorganic Compound ' $\mathrm{X}$ ' on treatment with concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ produces brown fumes and gives dark brown ring with $\mathrm{FeSO}_{4}$ in presence of concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$. Also Compound ' $\mathrm{X}$ ' gives precipitate ' $\mathrm{Y}^{\prime}$, when its solution in dilute $\mathrm{HCl}$ is treated with $\mathrm{H}_{2} \mathrm{~S}$ gas. The precipitate ' $\mathrm{Y}$ ' on treatment with concentrated $\mathrm{HNO}_{3}$ fol...
Read More →The CORRECT order of first ionisation enthalpy is:
Question: The CORRECT order of first ionisation enthalpy is:$\mathrm{Mg}\mathrm{S}\mathrm{Al}\mathrm{P}$$\mathrm{Mg}\mathrm{Al}\mathrm{S}\mathrm{P}$$\mathrm{Al}\mathrm{Mg}\mathrm{S}\mathrm{P}$$\mathrm{Mg}\mathrm{Al}\mathrm{P}\mathrm{S}$Correct Option: 3, Solution: $\mathrm{Mg} \mathrm{Al} \quad \mathrm{P} \quad \mathrm{S} \rightarrow \mathrm{IE}$. order $\Rightarrow \mathrm{Al}\mathrm{Mg}\mathrm{S}\mathrm{P}$...
Read More →Which one among the
Question: Which one among the following resonating structures is not correct?Correct Option: 1 Solution: It is unstable RS (due to similar charge on adjacent atom)...
Read More →200 mL of 0.2 M HCl is mixed with 300 mL of 0.1 M NaOH. The molar heat of neutralization of this reaction is –57.1 kJ. The increase in
Question: 200 mL of 0.2 M HCl is mixed with 300 mL of 0.1 M NaOH. The molar heat of neutralization of this reaction is 57.1 kJ. The increase in temperature in ${ }^{\circ} \mathrm{C}$ of the system on mixing is $x \times 10^{-2}$. The value of x is ________ . (Nearest integer) [Given : Specific heat of water $=4.18 \mathrm{~J} \mathrm{~g}^{-1} \mathrm{~K}^{-1}$ Density of water $=1.00 \mathrm{~g} \mathrm{~cm}^{-3}$ ] (Assume no volume change on mixing) Solution: $\Rightarrow$ Millimoles of $\mat...
Read More →Given below are two statement: one is labelled as Assertion
Question: Given below are two statement: one is labelled as Assertion $\mathbf{A}$ and the other is labelled as Reason $\mathbf{R}$. Assertion $\mathbf{A}: \mathbf{S O}_{2}(\mathrm{~g})$ is adsorbed to a large extent than $\mathrm{H}_{2}(\mathrm{~g})$ on activated charcoal. Reason $\mathbf{R}: \mathrm{SO}_{2}(\mathrm{~g})$ has a higher critical temperature than $\mathrm{H}_{2}(\mathrm{~g})$. In the light of the above statements, choose the most appropriate answer from the options given below.Bot...
Read More →Which one of the following compounds
Question: Which one of the following compounds of Group-14 elements is not known?$\left[\mathrm{GeCl}_{6}\right]^{2-}$$\left[\mathrm{Sn}(\mathrm{OH})_{6}\right]^{2-}$$\left[\mathrm{SiCl}_{6}\right]^{2-}$$\left[\mathrm{SiF}_{6}\right]^{2-}$Correct Option: , 3 Solution: $\left[\mathrm{SiCl}_{6}\right]^{2-}$ does not exist due to steric crowding of surrounding atoms....
Read More →The ionic radii of
Question: The ionic radii of $\mathrm{K}^{+}, \mathrm{Na}^{+}, \mathrm{Al}^{3+}$ and $\mathrm{Mg}^{2+}$ are in the order:$\mathrm{Na}^{+}\mathrm{K}^{+}\mathrm{Mg}^{2+}\mathrm{Al}^{3+}$$\mathrm{Al}^{3+}\mathrm{Mg}^{2+}\mathrm{K}^{+}\mathrm{Na}^{+}$$\mathrm{Al}^{3+}\mathrm{Mg}^{2+}\mathrm{Na}^{+}\mathrm{K}^{+}$$\mathrm{K}^{+}\mathrm{Al}^{3+}\mathrm{Mg}^{2+}\mathrm{Na}^{+}$Correct Option: , 3 Solution: $\mathrm{Al}^{3+}, \mathrm{Mg}^{2+}$ and $\mathrm{Na}^{+}$are isoelectronic ionic species. For mo...
Read More →Chemical nature of the nitrogen oxide compound obtained
Question: Chemical nature of the nitrogen oxide compound obtained from a reaction of concentrated nitric acid and $\mathrm{P}_{4} \mathrm{O}_{10}$ (in $4: 1$ ratio) is :acidicbasicamphotericneutralCorrect Option: 1 Solution: Ans. $\mathrm{N}_{2} \mathrm{O}_{5}$ is acidic in nature....
Read More →The number of f electrons in the ground state electronic configuration of Np (Z = 93) is ________. (Nearest integer)
Question: The number of f electrons in the ground state electronic configuration of Np (Z = 93) is ________. (Nearest integer) Solution: $\mathrm{Np}=1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6} 4 \mathrm{~s}^{2} 3 \mathrm{~d}^{10} 4 \mathrm{p}^{6} 5 \mathrm{~s}^{2} 4 \mathrm{~d}^{10} 5 \mathrm{p}^{6} 6 \mathrm{~s}^{2}$ Total no. of 'f' electron $=14 \mathrm{e}^{-}+4 \mathrm{e}^{-}=18$...
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) - (v), (b) - (i), (c) - (ii), (d) - (iv)(a) - (v), (b) - (ii), (c) - (iv), (d) - (i)(a) - (iv), (b) - (iii), (c) - (i), (d) - (ii)(a) - (v), (b) - (iii), (c) - (ii), (d) - (i)Correct Option: , 4 Solution: Li makes alloy with Lead to make white metal bearings for motor engines Liquid Na metal is used as coolant in fast breeder nuclear reactor $\mathrm{K}$ is a very absorbent of $\mathrm{CO}_{2}$ Cs ...
Read More →Which one of the products
Question: Which one of the products of the following reactions does not react with Hinsberg reagent to form sulphonamide?Correct Option: , 2 Solution:...
Read More →The number of neutrons and electrons,
Question: The number of neutrons and electrons, respectively, present in the radioactive isotope of hydrogen is :-1 and 13 and 12 and 12 and 2Correct Option: , 3 Solution: Radioactive isotope of hydrogen is Tritium $\left({ }_{1}^{3} \mathrm{~T}\right)$ No. of neutrons $(\mathrm{A}-\mathrm{Z})=3-1=2$ No. of electrons $=1$...
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