Assertion: For the extraction of iron,
Question: Assertion: For the extraction of iron, haematite ore is used. Reason: Haematite is a carbonate ore of iron.Only the reason is correct.Both the assertion and reason are correct and the reason is the correct explanation for the assertion.Only the assertion is correct.Both the assertion and reason are correct, but the reason is not the correct explanation for the assertion.Correct Option: , 3 Solution: Assertion is correct as Haemetite ore is used for extraction of Fe. Haemetite is an oxi...
Read More →Consider the hydrates ions of
Question: Consider the hydrates ions of $\mathrm{Ti}^{2+}, \mathrm{V}^{2+}, \mathrm{Ti}^{3+}$ and $\mathrm{Sc}^{3+}$. The correct order of their spin-only magnetic moments is :$\mathrm{Sc}^{3+}\mathrm{Ti}^{3+}\mathrm{Ti}^{2+}\mathrm{V}^{2+}$$\mathrm{Ti}^{3+}\mathrm{Ti}^{2+}\mathrm{Sc}^{3+}\mathrm{V}^{2+}$$\mathrm{Sc}^{3+}\mathrm{Ti}^{3+}\mathrm{V}^{2+}\mathrm{Ti}^{2+}$$\mathrm{V}^{2+}\mathrm{Ti}^{2+}\mathrm{Ti}^{3+}\mathrm{Sc}^{3+}$Correct Option: 1 Solution:...
Read More →Amylopectin is composed of:
Question: Amylopectin is composed of:$\alpha-\mathrm{D}-$ glucose, $\mathrm{C}_{1}-\mathrm{C}_{4}$ and $\mathrm{C}_{1}-\mathrm{C}_{6}$ linkages$\alpha$-D-glucose, $\mathrm{C}_{1}-\mathrm{C}_{4}$ and $\mathrm{C}_{2}-\mathrm{C}_{6}$ linkages$\beta$-D-glucose, $C_{1}-C_{4}$ and $C_{2}-C_{6}$ linkages$\beta$-D-Glucose, $\mathrm{C}_{1}-\mathrm{C}_{4}$ and $\mathrm{C}_{1}-\mathrm{C}_{6}$ linkagesCorrect Option: 1 Solution: Amylopetcin is a homopolymer of $\alpha-\mathrm{D}$-glucose where $\mathrm{C}_{...
Read More →The major product of the following reaction is :
Question: The major product of the following reaction is : Correct Option: , 3 Solution:...
Read More →The peptide that gives positive ceric ammonium
Question: The peptide that gives positive ceric ammonium nitrate and carbylamine tests is :Lys-AspSer-LysGln-AspAsp-GlnCorrect Option: , 2 Solution:...
Read More →Among the following species,
Question: Among the following species, the diamagnetic molecule is$\mathrm{O}_{2}$$\mathrm{NO}$$\mathrm{B}_{2}$$\mathrm{CO}$Correct Option: , 4 Solution: $\mathrm{O}_{2}, \mathrm{NO}, \mathrm{B}_{2}$ are paramagnetic according to M.O.T. where as $\mathrm{CO}$ is diamagnetic....
Read More →The correct statements among I to III
Question: The correct statements among I to III regarding group 13 element oxides are, (I) Boron trioxide is acidic. (II) Oxides of aluminium and gallium are amphoteric. (III) Oxides of indium and thalliumare basic.(I), (II) and (III)(II) and (III) only(I) and (III) only(I) and (II) onlyCorrect Option: 1 Solution: All statements are correct...
Read More →The principle of column chromatography is :
Question: The principle of column chromatography is : Capillary action.Gravitational force.Differential adsorption of the substances on the solid phase.Differential absorption of the substances on the solid phase.Correct Option: , 3 Solution: Main principle of column chromatography is differential adsorption of the substance on the solid phase....
Read More →Major products of the following reaction are :
Question: Major products of the following reaction are : $\mathrm{CH}_{3} \mathrm{OH}$ and $\mathrm{HCO}_{2} \mathrm{H}$Correct Option: , 4 Solution: This is cross cannizaro reaction so more reactive carbonyl compound is oxidized and less reactive...
Read More →Consider the following statements
Question: Consider the following statements (a) The $\mathrm{pH}$ of a mixture containing $400 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{H}_{2} \mathrm{SO}_{4}$ and $400 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{NaOH}$ will be approximately 1.3. (b) Ionic product of water is temperature dependent. (c) A monobasic acid with $\mathrm{K}_{\mathrm{a}}=10^{-5}$ has a $\mathrm{pH}=5$. The degree of dissociation of this acid is $50 \%$. (d) The Le Chatelier's principle is not applicable to common-ion eff...
Read More →Which one of the following about an electron occupying
Question: Which one of the following about an electron occupying the $1 \mathrm{~s}$ orbital in a hydrogen atom is incorrect ? (The Bohr radius is represented by $\mathrm{a}_{0}$ )The electron can be found at a distance $2 \mathrm{a}_{0}$ from the nucleusThe probability density of finding the electron is maximum at the nucleus.The magnitude of potential energy is double that of its kinetic energy on an average.The total energy of the electron is maximum when it is at a distance $a_{0}$ from the ...
Read More →Match the refining methods (Column I) with metals (Column II).
Question: Match the refining methods (Column I) with metals (Column II). (I) $-(\mathrm{b}) ;(\mathrm{II})-(\mathrm{c}) ;(\mathrm{III})-(\mathrm{d}) ;(\mathrm{IV})-(\mathrm{a})$(I) $-(\mathrm{b}) ;(\mathrm{II})-(\mathrm{d}) ;(\mathrm{III})-(\mathrm{a}) ;(\mathrm{IV})-(\mathrm{c})$$(\mathrm{I})-(\mathrm{c}) ;(\mathrm{II})-(\mathrm{a}) ;(\mathrm{III})-(\mathrm{b}) ;(\mathrm{IV})-(\mathrm{d})$$(\mathrm{I})-(\mathrm{c}) ;(\mathrm{II})-(\mathrm{d}) ;(\mathrm{III})-(\mathrm{b}) ;(\mathrm{IV})-(\mathrm...
Read More →The major products
Question: The major products $\mathrm{A}$ and $\mathrm{B}$ for the following reactions are, respectively: Correct Option: , 2 Solution:...
Read More →The amorphous form of silica is :
Question: The amorphous form of silica is :quartzkieselguhrcristobalitetridymiteCorrect Option: , 2 Solution: Kieselguhr is amorphous form of silica, it's a fact...
Read More →The species that can have a trans-isomer is :
Question: The species that can have a trans-isomer is : (en $=$ ethane-1, 2 -diamine, ox $=$ oxalate)$\left[\mathrm{Pt}(\mathrm{en}) \mathrm{Cl}_{2}\right]$$\left[\mathrm{Cr}(\mathrm{en})_{2}(\mathrm{ox})\right]^{+}$$\left[\mathrm{Zn}(\mathrm{en}) \mathrm{Cl}_{2}\right]$$\left[\mathrm{Pt}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{2+}$Correct Option: , 4 Solution:...
Read More →During compression of a spring the work done
Question: During compression of a spring the work done is $10 \mathrm{~kJ}$ and $2 \mathrm{~kJ}$ escaped to the surroundings as heat. The change in internal energy, $\Delta \mathrm{U}($ inkJ) is:812$-12$$-8$Correct Option: 1 Solution:...
Read More →The isoelectronic set of ions is:
Question: The isoelectronic set of ions is:$\mathrm{N}^{3-}, \mathrm{Li}^{+}, \mathrm{Mg}^{2+}$ and $\mathrm{O}^{2-}$$\mathrm{Li}^{+}, \mathrm{Na}^{+}, \mathrm{O}^{2-}$ and $\mathrm{F}^{-}$$\mathrm{F}^{-}, \mathrm{Li}^{+}, \mathrm{Na}^{+}$and $\mathrm{Mg}^{2+}$$\mathrm{N}^{3}-\mathrm{O}^{2-}, \mathrm{F}^{-}$and $\mathrm{Na}^{+}$Correct Option: , 4 Solution:...
Read More →The one that is not a carbonate is :
Question: The one that is not a carbonate is :bauxitesideritecalaminemalachiteCorrect Option: 1 Solution:...
Read More →Solve this following
Question: Ethylamine $\left(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}\right)$ can be obtained from N-ethylphthalimide on treatment with :$\mathrm{NaBH}_{4}$$\mathrm{CaH}_{2}$$\mathrm{H}_{2} \mathrm{O}$$\mathrm{NH}_{2} \mathrm{NH}_{2}$Correct Option: , 4 Solution: reagent is $\mathrm{NH}_{2}-\mathrm{NH}_{2}$ byproduct will be...
Read More →Increasing order of reactivity of the following compounds
Question: Increasing order of reactivity of the following compounds for $\mathrm{S}_{\mathrm{N}} 1$ substitution is: $(\mathrm{B})(\mathrm{C})$ (D) $$ (A)$(\mathrm{A})(\mathrm{B})(\mathrm{D})(\mathrm{C})$$(\mathrm{B})(\mathrm{A})(\mathrm{D})(\mathrm{C})$$(\mathrm{B})(\mathrm{C})(\mathrm{A})$ (D)Correct Option: , 3 Solution: $\mathrm{S}_{\mathrm{N}} 1$ Reactivity order...
Read More →Solve the following :
Question: Write the number significant digits in (a) 1001 , (b) $100.1$, (c) $100.10$, (d) $0.001001$. Solution: The number of significant digits are as follows: a) 4 b) 4 c) 5 d) 4...
Read More →Solve the following :
Question: The changes in a function $\mathrm{y}$ and the independent variable $\mathrm{x}$ are related as $\frac{d y}{d x}=x^{2}$. of $x$. Find $y$ as a function Solution: It is given that $\frac{d y}{d t}=x^{2}$ We can write $d y=x^{2} d x$ or, $y=\int^{x^{2}} d x=\frac{x^{3}}{3}+c$...
Read More →Solve the following :
Question: The momentum $\rho$ of a particle changes with time $t$ according to the relation $\frac{a \rho}{d t}=(10 \mathrm{~N})+(2 \mathrm{~N} / \mathrm{s}) t$ the momentum is zero at $\mathrm{t}=0$, what will be the momentum be at $\mathrm{t}=10$ s? Solution: It is given that $\frac{\frac{d p}{d t}}{}=(10 \mathrm{~N})+\left(\frac{2 N}{a}\right) t$ Now, $p=0$ at $t=0$. So, $p=\int_{0}^{10}(10 d t+2 t d t)=10(10-0)+(100-0)=200 \mathrm{~N} / \mathrm{s}=200 \mathrm{~kg} \mathrm{~m} / \mathrm{s}$...
Read More →Solve the following :
Question: A rod of length $\mathrm{L}$ is placed along the $\mathrm{X}$-axis between $\mathrm{x}=0$ and $\mathrm{X}=\mathrm{L}$. The linear density (mass/length) $p$ of the rod varies with the distance $\mathrm{x}$ from the origin as $p=\alpha+b \mathrm{~b}$. (a) Find the SI units of $\mathrm{a}$ and $\mathrm{b}$. (b) Find the mass of the rod in terms of $a, b$ and $L$. Solution: It is given that linear density (mass per unit length) $p=\mathrm{a}+\mathrm{bx}$, where $\mathrm{x}$ is distance fro...
Read More →Find the area bounded by the curve :
Question: Find the area bounded by the curve, $y=e^{-x}$, the $X$-axis and the $Y$-axis. Solution: The equation of the curve is $y=e^{-x}$. And when $x=0$, then $y=e^{-0}=1$. Now, $y=0$ when $x=\infty$. Using these boundaries, we get, Area $=\int_{0}^{i w} e^{-x} d x=1$....
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