Recent questions in 1998

The second order Bragg diffraction of X-rays with $\lambda$ = 1.00 Å from a set of parallel planes in a metal occurs at an angle 60º. The distance between the scattering planes in the crystal is :

asked Jun 15, 2018 by pady_1

1 answer

Which one of the following pairs of substances on reaction will not evolve $H_2$ gas ?

asked Jun 15, 2018 by pady_1

1 answer

At the critical micelle concentration (CMC) the surfactant molecules :

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1 answer

The edge length of face centred unit cubic cells is 508 pm. If the radius of the cation is 110 pm, the radius of the anion is :

asked Jun 15, 2018 by pady_1

1 answer

Identify the correct statement regarding entropy:

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1 answer

The number of molecules of ATP produced in the lipid metabolism of a molecule of palmitic acid is :

asked Jun 15, 2018 by pady_1

1 answer

Uncertainity in position of a $e^–$ and He is similar. If uncertainity in momentum of $e ^–$ is $32 \times 10^ 5$ , then uncertainity in momentum of He will be :

asked Jun 15, 2018 by pady_1

1 answer

Mole fraction of solute is 0.2 in solution then lowering in V.P $\bigtriangleup P = 10$ . If lowering in V.P. $\bigtriangleup P = 20$ then mole fraction of solvent will be in solution :

asked Jun 15, 2018 by pady_1

1 answer

The radius of hydrogen shell is 0.53Å, then in first excited state radius of shell will be :

asked Jun 15, 2018 by pady_1

1 answer

In $PO{_4^ {-3}}$ formal charge on every oxygen atom and P-O bond order is respectively :

asked Jun 15, 2018 by pady_1

1 answer

$4NH_3+5O_2\rightarrow6H_2O+4NO$ <br> When one mole ammonia and one mole oxygen taken :

asked Jun 15, 2018 by pady_1

1 answer

In the Haemoglobin (Molecular wt = 67200) iron found 0.33% (by weight). The number of iron atom will be in its one molecule :

asked Jun 15, 2018 by pady_1

1 answer

By which method activation energy can be calculated?

asked Jun 15, 2018 by pady_1

1 answer

The IUPAC name of $[Co(NH_3)_3)ClBrNO_2]$ will be :

asked Jun 15, 2018 by pady_1

1 answer

Maximum oxidation state will be of :

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1 answer

Schottky defect shows :

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1 answer

Maximum impurity in Pig iron will be of :

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1 answer

Number of significant number will be in following numbers : <br> a)161 cm b)0.0161 c)1.61

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1 answer

Which of the following gives colour with the water :

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1 answer

First ionization potential of Be and B will be :

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1% solution of other compound is isotonic with 5% sucrose (sugar) solution. Then molecular wt. of compound will be :

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1 answer

When $X\rightarrow{_7N^{14}}+2\beta^-$ – then number of neutron will be in X :

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1 answer

$_nX^m$ emitted one $\alpha$ and $2\beta$ particles, then it will become :

asked Jun 15, 2018 by pady_1

1 answer

Number of isomers of $[Pt(NH_3)_4][CuCl_4]$ complex are :

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1 answer

The chiral centre is absent in :

asked Jun 15, 2018 by pady_1

1 answer

The fertilizer which makes the soil acidic :

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1 answer

In which of the following molecule. The internuclear distance will be maximum :

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1 answer

Density of which of the following substance not decreases on adding $Br_2$ vapours :

asked Jun 15, 2018 by pady_1

1 answer

$A + B \rightleftharpoons C + D Constant = K_{1}$ <br> $E + F \rightleftharpoons G + H Constant = K_{2}$ <br> then $C + D + E + F \Rightarrow$ product. The constant of reaction will be :

asked Jun 15, 2018 by pady_1

1 answer

The cell reaction of an electrochemical cell is $Cu^{+2}(C_1) + Zn \rightarrow Zn^{+2}(C_2) + Cu$ . The change in free energy will be the function of :

asked Jun 15, 2018 by pady_1

1 answer

The concentration of $ZnCl_{2}$ solution will change when it is placed in a container which is made of :

asked Jun 15, 2018 by pady_1

1 answer

When a substance A reacts with water it produces a combustible gas B and a solution of substance C in water. When another substance D reacts with this solution of C, it also produces the same gas B on warming but D can produce gas B on reaction with dilute sulphuric acid at room temperature. A imparts a deep golden yellow colour to a smokeless flame of bunsen burner A, B, C and D respectively are:

asked Jun 15, 2018 by pady_1

1 answer

The number of antibonding electron pair in $O{_2}^{-2}$ is :

asked Jun 15, 2018 by pady_1

1 answer

Which of the following molecule is not paramagnetic :

asked Jun 15, 2018 by pady_1

1 answer

A complex compound which is formed by ligands nitrate and chloride. It gives two moles of AgCl precipitate with $AgNO_{3}$ . What will be its formulae :

asked Jun 15, 2018 by pady_1

1 answer

Aniline reacts with $Br_{2}$ water, $NaNO_{2}/HCl$ gives respectively :

asked Jun 15, 2018 by pady_1

0 answers

Which of the following does not give nucleophilic substitution with alcohol :

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1 answer

2-Bromo pentane reacts with ethanolic KOH gives main product :

asked Jun 15, 2018 by pady_1

1 answer

The base found in DNA but not in RNA :

asked Jun 15, 2018 by pady_1

1 answer

Glucose +x phenyl hydrazine $\rightarrow$ osazone 'x' will be :

asked Jun 15, 2018 by pady_1

1 answer

Percentage of C, H & N are given as follows : C = 40% H = 13.33% N = 46.67% The empirical formula will be :

asked Jun 15, 2018 by pady_1

1 answer

Which of the following does not give claisen condensation reaction :

asked Jun 15, 2018 by pady_1

1 answer

Which of the following is not the characteristic of arenes :

asked Jun 15, 2018 by pady_1

1 answer

Which of the following does not given iodoform test :

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1 answer

IUPAC name of

asked Jun 15, 2018 by pady_1

1 answer

Aspirin can be prepared by the reaction of acetyl chloride with :

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1 answer

Correct order of –I effect is :

asked Jun 15, 2018 by pady_1

1 answer

A particle, with restoring force proportional to displacement and resisting force proportional to velocity is subjected to a force F sin $\omega$ t. If the amplitude of the particle is maximum for $\omega$ = $\omega_{1}$ and the energy of the particle maximum for $\omega$ = $\omega_{2}$ , then :

asked Jun 15, 2018 by pady_1

1 answer

A point Q lies on the perpendicular bisector of an electrical dipole of dipole moment p. If the distance of Q from the dipole is r (much larger than the size of the dipole), then the electric field at Q is proportional to :

asked Jun 15, 2018 by pady_1

2 answers

We consider a thermodynamic system. If $\Delta$ U represents the increase in its internal energy and W the work done by the system, which of the following statements is true ?

asked Jun 15, 2018 by pady_1

1 answer

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