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Reduction of the metal centre in aqueous permanganate ion involves {MULTI CHOICE CORRECT}
29.2%(w/w) HCl stock solution has a density of 1.25g/ml. The molecular weight of HCl is 36.5g/mol. The volume (mL) of stock solution required to prepare a 200 mL solution of 0.4 M HCl is?
In acidic medium, 100ml of 0.01M KMnO_{4} solution oxidizes 100ml H_{2}O_{2} solution. The volume of 0.01M KMnO_{4} solution required to oxidize the same volume of H_{2}O_{2} in alkaline medium in ml is:
The molality of a urea solution in which 0.0100 g of urea, [(NH_{2})_{2}CO] is added to 0.3000 dm^{3} of water at STP is:
For the estimation of nitrogen, 1.4g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60mL of M/10 sulphuric acid. The unreacted acid required 20mL of M/10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is
Hydrogen Peroxide can act as both oxidizing and reducing agent depending upon the nature of the reacting species. In which of the following cases does H_{2}O_{2} act as a reducing agent in acidic medium.
2.5 mL of 2M/5 weak monoacidic base (K_{b} = 1×10^{–12} at 25^{0} C) is titrated with 2M/15 HCl in water at 25^{0} C. The concentration of H^{+} at equivalence point is (K_{w}=1×10^{–14} at 25^{0} C)
The density of a solution prepared by dissolving 120 g of urea (mol. Mass = 60 u ) in 1000g of water is 1.15 g/mL. The molarity of this solution is :
Consider the following list of reagents: Acidified K_{2}Cr_{2}O_{7}, alkaline KMnO_{4}, CuSO_{4}, H_{2}O_{2}, Cl_{2}, O_{3}, FeCl_{3}, HNO_{3} and Na_{2}S_{2}O_{3}. The total number of reagents that can oxidise aqueous iodide to iodine is
A gaseous hydrocarbon gives upon combustion 0.72 g of water and 3.08 g of CO_{2}. The empirical formula of the hydrocarbon is:
A metal nitride contains 28% nitrogen by weight. The molecular formula of metal nitride is M_{3}N_{2}. What is the atomic weight of the metal?
Hydrogen peroxide, in its reaction with KIO_{4} and NH_{2}OH respectively, is acting as a
The density (in g/mL) of a 3.60 M sulphuric acid solution that is 29 % H_{2}SO_{4} (Molar mass = 98 g/mol) by mass will be
The number of molecules of CO_{2} liberated by the complete combustion of 0.1 gram atom of graphite in air is :
Dissolving 120 g of a compound (mol. wt. 60) in 1000 g of water gave a solution of density 1.12 g/ml. The molarity of the solution is :
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]]>Alcohol
An alcohol is any organic compound in which the hydroxyl functional group (–OH) is bound to a saturated carbon atom. Alcohols are usually classified as primary, secondary and tertiary alcohols.
Phenol
Phenol, also known as carbolic acid, is an aromatic organic compound with the molecular formula C_{6}H_{5}OH. It is a white crystalline solid that is volatile. The molecule consists of a phenyl group (−C_{6}H_{5}) bonded to a hydroxyl group (−OH). It is mildly acidic.
Preparation of Alcohols
From Haloalkanes
From Reduction of Aldehydes and ketones
From Reduction of Carboxylic acid and esters
From Grignard Reagent
From hydration of alkenes
From Oxymercuration and Demercuration of Alkenes
From Aliphatic Primary Amines
Preparation of Phenols
From haloarenes: Chlorobenzene is an example of haloarenes which is formed by mono substitution of benzene ring. When chlorobenzene is fused with sodium hydroxide at 623K and 320 atm sodium phenoxide is produced. Finally, sodium phenoxide on acidification gives phenols.
From benzene sulphonic acid: Benzenesulphonic acid can be obtained from benzene by reacting it with oleum. Benzenesulphonic acid thus formed is treated with molten sodium hydroxide at high temperature which leads to the formation of sodium phenoxide. Finally, sodium phenoxide on acidification gives phenols.
From diazonium salts: When an aromatic primary amine is treated with nitrous (NaNO_{2} + HCl) acid at 273 – 278 K, diazonium salts are obtained. These diazonium salts are highly reactive in nature. Upon warming with water, these diazonium salts finally hydrolyse to phenols. Phenols can also be obtained from diazonium salts by treating it with dilute acids.
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The midpoint of the chord 4x−3y=5 of the hyperbola 2x^{2}−3y^{2}=12 is ?
If the line lx+my=1 is a normal to the hyperbola, b^{2}x^{2}−a^{2}y^{2}=a^{2}b^{2}, then (a^{2}/l^{2})−(b^{2}/m^{2}) is equal to
The tangent at an extremity (in the first quadrant) of latus rectum of the hyperbola 5x^{2}−4y^{2}=20, meets xaxis and yaxis at A and B respectively. Then (OA)^{2}−(OB)^{2}, where O is the origin, equals:
The area (in square units) of the equilateral triangle formed by the tangent at (√3,0) to the hyperbola x^{2}−3y^{2}=3 with the pair of asymptotes of the hyperbola is
If the circle x^{2}+y^{2}=a^{2} intersect the hyperbola xy=c^{2 }at four points (x_{i},y_{i}),and i=1,2,3,4.
Then, y_{1}+y_{2}+y_{3}+y_{4}=?
Equation of one of the tangents passing through (2,8) to the hyperbola 5x^{2}−y^{2}=5 is
A hyperbola, having the transverse axis of length 2sinθ, is confocal with the ellipse 3x^{2}+4y^{2}=12. Then its equation is
The equation of the hyperbola which passes through the point (2,3) and has the asymptotes 4x+3y−7=0 and x−2y−1=0 is:
If x=9 is a chord of contact of the hyperbola x^{2}−y^{2}=9, then the equation of the tangent at one of the points of contact is
The distance between the foci of the hyperbola x^{2}−3y^{2}−4x−6y−11=0 is
Let the eccentricity of the hyperbola b^{2}x^{2}−a^{2}y^{2}=a^{2}b^{2} be reciprocal to that of the ellipse x^{2}+4y^{2}=4. If the hyperbola passes through a focus of the ellipse, then {MULTI CHOICE CORRECT}
For the hyperbola, x^{2}sin^{2}α−y^{2}cos^{2}α= (sin^{2}α*cos^{2}α), which of the following remains constant when α varies?
If the line ax + by + c = 0 is a normal to the hyperbola xy = 1, then
Area of triangle formed by the tangent at one vertex and asymptotes of the hyperbola xy = 2
The product of lengths of perpendiculars from any point of the hyperbola x^{2} – y^{2} = 8 to its asymptotes is
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A focus of an ellipse is at the origin. The directrix is the line x=4 and the eccentricity is 0.5. Then the length of the semimajor axis is
Equation of the circle passing through the foci of the ellipse (x^{2}/16) + (y^{2}/9)=1 and having centre at (0,3) is :
The value of k , if (1,2),(k,−1) are conjugate points with respect to the ellipse 2x^{2}+3y^{2}=6 is
If the curves b^{2}x^{2 }+ a^{2}y^{2}=a^{2}b^{2} and 16x^{2}+25y^{2}=400 cut each other orthogonally, then a^{2}−b^{2}=
The locus of a point such that the sum of its distance from the points (0,2) and (0,2) is 6,is
The length of the latus rectum of the conic 5=2r+3rcosθ+4rsinθ is :
If tangents are drawn from any point on the circle x^{2}+y^{2}=25 to the ellipse 9x^{2}+16y^{2}=144, then the angle between the tangents is
Let a and b be nonzero real numbers. Then, the equation (ax^{2}+by^{2}+c)(x^{2}–5xy+6y^{2}) = 0 represents
The minimum area of a triangle formed by any tangent to the ellipse 81x^{2}+16y^{2}=1296 and the coordinate axes is:
If the line 2x+5y=12 intersects the ellipse 4x^{2}+5y^{2}=20 in two distinct points A and B, then midpoint of AB is
The ellipse E1: 4x^{2}+9y^{2}=36 is inscribed in a rectangle R whose sides are parallel to the coordinate axes. Another ellipse E_{2} passing through the point (0,4) circumscribes the rectangle R. The eccentricity of the ellipse E_{2 }is
Statement 1 : An equation of a common tangent o the parabola y^{2}=(16√3)x and the ellipse 2x^{2}+y^{2}=4 is y=2x+2√3.
Statement 2: If the line my=m^{2}x + (4√3),(m≠0) is a common tangent o the parabola y^{2}=(16√3)x and the ellipse 2x^{2}+y^{2}=4,then m satisfies m^{4}+2m^{2}=24.
If the distance between the foci of an ellipse is 6 and the length of the minor axis is 8, then the eccentricity of the conic is ?
Tangents are drawn from the point P (3,4) to the ellipse 4x^{2}+9y^{2}=36 touching the ellipse at the points A and B.
An ellipse intersects the hyperbola 2x^{2}–2y^{2}=1 orthogonally. The eccentricity of the ellipse is reciprocal of that of the hyperbola. If the axes of the ellipse are along the coordinates axes, then
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STATEMENT1 : Alkali metals dissolve in liquid ammonia to give blue solutions. because
STATEMENT2 : Alkali metals in liquid ammonia give solvated species of the type [M(NH_{3})_{n}]^{+ }(M = alkali metals).
In context with the industrial preparation of hydrogen from water gas (CO+H_{2}), which of the following is the correct statement?
Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not formed in these reactions ?
The product (s) formed when H_{2}O_{2} reacts with disodium hydrogen phosphate is?
Observe the following statements:
the correct statements are:
Assertion (A) : K, Rb, Cs form superoxides
Reason (R) : The stability of superoxides increase from K to Cs due to decrease in lattice energy.
Which of the following statements are correct for alkali metal compounds ?
(i)Superoxides are paramagnetic in nature.
(ii)The basic strength of hydroxides increases down the group.
(iii)The conductivity of chlorides in their aqueous solutions decreases down the group.
(iv)The basic nature of carbonates in aqueous solutions is due to cationic hydrolysis.
Among the following, which is water insoluble?
Solvay process is used in the maufacture of :
The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is :
The compound(s) formed upon combustion of sodium metal in excess air is(are) {MULTI CHOICE CORRECT}
Reaction of Br_{2} with Na_{2}CO_{3} in aqueous solution gives sodium bromide and sodium bromate with evolution of CO_{2 }gas. The number of sodium bromide molecules involved in the balanced chemical equation is
Fluorine reacts with dilute NaOH to give gaseous product A. The bond angle in molecule A is
Very pure hydrogen (99.9%) can be made by which of the following processes?
The number of types of bonds between two carbon atoms in calcium carbide is:
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An aqueous solution of metal ion M_{1} reacts separately with reagents Q and R in excess to give tetrahedral and square planar complexes, respectively. An aqueous solution of another metal ion M_{2} always forms tetrahedral complexes with these reagents. Aqueous solution of M_{2} on reaction with reagent S gives white precipitate which dissolves in excess of S. The reactions are summarized in the scheme given below:
In the above, Q and R, respectively are
Consider the following equilibrium
White precipitate of AgCl appears on adding which of the following?
Upon treatment with ammonical H_{2}S,the metal ion that precipitates as a sulfide is
An aqueous solution of a mixture of two inorganic salts,when treated with dilute HCl,gives a precipitate (P) and a filtrate (Q).The precipitate P was found to dissolve in hot water.The filtrate Q remained unchanged,when treated with H2S in a dilute mineral acid medium.However,it gave a precipitate (R) with H2S in an ammoniacal medium.The precipitate R gave a colored solution (S),when treated with H_{2}O_{2} in an aqueous NaOH medium. The precipitate P contains
Solution “X” contains Na_{2}CO_{3} and NaHCO_{3}. 20 ml of X when titrated using methyl orange indicator consumed 60 ml of 0.1 M HCl solution.In another experiment, 20 ml of X solution when titrated using phenolphthalein consumed 20 ml of 0.1 M HCl solution.The concentrations(in mol lit^{−1}) of Na_{2}CO_{3} and NaHCO_{3} in X are respectively
pAminoN,Ndimethylaniline is added to a strongly acidic solution of X. The resulting solution is treated with a few drops of aqueous solution of Y to yield blue coloration due to the formation of methylene blue. Treatment of the aqueous solution of Y with the reagent potassium hexacyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of Y with the solution of potassium hexacyanoferrate (III) leads to a brown coloration due to the formation of Z. The compound Y is
A solution of metal ion when treated with KI gives a red precipitate which dissolves in excess KI to give a colourless solution. Moreover, the solution of metal ion on treatment with a solution of cobalt(II) thiocyanate gives rise to a deep blue crystalline precipitate. The metal ion is
Which of the following gives prussian blue colour?
Which one of the following gives yellow precipitate with iodine and NaOH solution ?
Among PbS, CuS, HgS, MnS, Ag_{2}S, NiS, CoS, crystalline Bi_{2}S_{3} and SnS_{2}, the total number of black coloured sulphides is
Copper becomes green when exposed to moist air for a long period. This is due to:
29.5mg of an organic compound containing nitrogen was digested according to Kjeldahl’s method and the evolved ammonia was absorbed in 20mL of 0.1MHCl solution. The excess of the acid required 15mL of 0.1MNaOH solution for complete neutralization. The percentage of nitrogen in the compound is
Passing H_{2}S gas into a mixture of Mn^{2+},Ni^{2+}, Cu^{2+} and Hg^{2+} ions in an acidified aqueous solution precipitates
How many ‘ml’ of perhydrol is required to produce sufficient oxygen which can be used to completely convert 2 lit of SO_{2} gas to SO_{3} gas?
The solution of X having excess of caustic potash is used to detect ammonia. Which of the following is X?
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Extraction of zinc from zinc blende is achieved by
Which of the following is not added during the extraction of Silver by Cyanide process ?
Which method of purification is represented by the following equation :
Ti(s)+2I_{2}(g) → TiI_{4}(g) → Ti(s) + 2I_{2}(g)
Which one of the following is the mineral for tin?
The form of iron obtained from blast furnace is :
Upon heating with Cu2S,the reagent (s) that give copper metal is/are {MULTI CHOICE CORRECT}
There are some deposits of nitrates and phosphates in earth’s crust. Nitrates are more soluble in water. Nitrates are difficult to reduce under the laboratory conditions but microbes do it easily. Ammonia forms large number of complexes with transition metal ions. Hybridization easily explains the ease of sigma donation capability of NH_{3 }and PH_{3}. Phosphine is a flammable gas and is prepared from white phosphorus. Among the following, the correct statement is
Copper is the most noble of the first row transition metals and occurs in small deposits in several countries. Ores of copper include chalcanthite (CuSO_{4}.5H2O), atacamite (Cu_{2}Cl(OH)_{3}), cuprite (Cu_{2}O), copper glance (Cu_{2}S) and malachite (Cu_{2}(OH)_{2}CO_{3}). However, 80% of the world copper production comes from the ore chalcopyrite (CuFeS_{2}). The extraction of copper from chalcopyrite involves partial roasting, removal of iron and selfreduction.
Which one of the following ores is known as Malachite:
Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?
The unbalanced reaction given in ListI show missing reagent or condition in ListII.Match ListI with ListII.
The carbonbased reduction method is NOT used for the extraction of
Oxidation states of the metal in the minerals haematite and magnetite, respectively, are
Extraction of metal from the ore cassiterite involves
What is the role of limestone during the extraction of iron from haematite ore?
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The standard enthalpy of formation of NH_{3} is –46.0kJ/mol. If the enthalpy of formation of H_{2} from its atoms is –436kJ/mol and that of N_{2} is –712kJ/mol, the average bond enthalpy of N–H bond in NH_{3 }is
In which of the following, the bond angle is the lowest?
Which one of the following properties is not shown by NO?
What are the shapes of ethyne and methane ?
Which of the following set is correct?
The bond length of HCl molecule is 1.275A^{0 }and its dipole moment is 1.03 D.The ionic character of the molecule (in percent)
(charge of the electron =4.8×10^{−10 }esu)
Assuming that Hund’s rule is violated, the bond order and magnetic nature of the diatomic molecule B_{2} is
Assuming 2s−2p mixing is NOT operative, the paramagnetic species among the following is
Assuming 2s−2p mixing is NOT operative, the paramagnetic species among the following is
Which one of the following pairs of species have the same bond order?
STATEMENT1 : Boron always forms covalent bond. because
STATEMENT2 : The small size of B_{3}^{+}
favours formation of covalent bond.
Which one of the following does not have a pyramidal shape?
Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?
Which ordering of compounds is according to the decreasing order of the oxidation state of nitrogen?
What is the best description of the change that occurs when Na_{2}O(s) is dissolved in water ?
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