Recent questions in 2000

$2Zn+O_2\rightarrow 2ZnO$ $\bigtriangleup Gº$ = – 616 J $2Zn+S_2\rightarrow 2ZnS$ $\bigtriangleup Gº$ = – 293 J $S_2+2O_2 \rightarrow 2SO_2$ $\bigtriangleup Gº$ = – 408 J $\bigtriangleup Gº$ for the following reaction is : $2ZnS+3O_2 \rightarrow 2ZnO+ 2SO_2$

asked Jul 20, 2018 by pady_1

1 answer

At infinite dilution equivalent conductances of $Ba^{+2}$ & $Cl^-$ ions are 127 & $76ohm^{-1}$ $cm^{-1}$ $eq^{-1}$ respectively. Equivalent conductance of $BaCl_2$ at infinite dilutions is :

asked Jul 20, 2018 by pady_1

1 answer

Cell reaction is spontaneous when :

asked Jul 20, 2018 by pady_1

1 answer

For the disproportionation of copper : $2Cu^+\rightarrow Cu^{+2}+Cu$ , Eº is : - (Given Eº for $\frac{Cu^{+2}}{Cu}$ is 0.34 V & Eº for $\frac{Cu^{+2}}{Cu^+ }$ is 0.15 V :

asked Jul 20, 2018 by pady_1

1 answer

Which species does not exhibits paramagnetism :

asked Jul 20, 2018 by pady_1

2 answers

Which complex compound will give four isomers :

asked Jul 20, 2018 by pady_1

1 answer

Which compound has planar structure :

asked Jul 20, 2018 by pady_1

1 answer

Which of the following statement is correct for the stability of ions of ethyl alcohol and phenol :

asked Jul 20, 2018 by pady_1

1 answer

Which of the following element exhibit maximum oxidation state :

asked Jul 20, 2018 by pady_1

1 answer

Conjugate acid of $NH{_2^-}$ :

asked Jul 20, 2018 by pady_1

1 answer

In quantitative analysis of second group in lab. $H_2S$ gas is passed in acidic medium for ppt. When $Cu^{+2}$ and $Cd^{+2}$ react with KCN, than in which of the following condition, ppt will not be formed due to relative stability :

asked Jul 20, 2018 by pady_1

1 answer

A cube of any crystal A-atom placed at every corners and B-atom placed at every centre of face. The formula of compound :

asked Jul 20, 2018 by pady_1

1 answer

For a any reversible reaction. If increases concentration of reactants. Then effect on equilibrium constant :

asked Jul 20, 2018 by pady_1

1 answer

Correct relation b/w dissociation constant's of a di-basic acid :

asked Jul 20, 2018 by pady_1

1 answer

Equilibrium constant Kp for following reaction : $MgCO_3(s)\rightleftharpoons MgO(s)+CO_2(g)$

asked Jul 20, 2018 by pady_1

1 answer

In Friedal craft reaction Toluene can be prepared by :

asked Jul 20, 2018 by pady_1

1 answer

First product of the reaction between RCHO and $NH_2$ $NH_2$ : -

asked Jul 20, 2018 by pady_1

1 answer

asked Jul 20, 2018 by pady_1

0 answers

Polarization in acrolein as :

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1 answer

Ethyl benzoate can be prepared from benzoic acid by using :

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1 answer

Increasing order of electrophilic substitution for following compounds :

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1 answer

Which pair have not equal dimensions :

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1 answer

Two bulbs of (40 W, 200 V), and (100 W, 200 V). Then correct relation for their resistance :

asked Jul 20, 2018 by pady_1

1 answer

A car battery of emf 12 V and internal resistance $5\times10^{-2}\Omega$ , receives a current of 60 Å from external source, then terminal voltage of battery is :

asked Jul 20, 2018 by pady_1

1 answer

Who evaluated the mass of electron indirectly with help of charge :

asked Jul 20, 2018 by pady_1

1 answer

Nuclear – Fission is best explained by :

asked Jul 20, 2018 by pady_1

1 answer

Two spherical bob of masses $M_A$ and $M_B$ are hung vertically from two strings of length $l_A$ and $l_B$ respectively. They are excuting SHM with frequency relation $f_A$ = $2f_B$ , Then :

asked Jul 20, 2018 by pady_1

1 answer

For the adjoining diagram, a triangular lamina is shown the correct relation between $I_1$ , $I_2$ & $I_3$ is (I – moment of inertia)

asked Jul 20, 2018 by pady_1

1 answer

If $\overrightarrow{F}$ = $(60 \hat{i} + 15 \hat{j} – 3 \hat{k} ) N$ and $\overrightarrow{V }= (2 \hat{i} – 4\hat{j} + 5 \hat{k} ) m/s$ , then instantaneous power is :

asked Jul 20, 2018 by pady_1

0 answers

A string is cut into three parts, having fundamental frequencies $n_1$ , $n_2$ and $n_3$ respectively. Then original fundamental frequency 'n' related by the expression as :

asked Jul 20, 2018 by pady_1

1 answer

Two stationary sources each emitting waves of wave length $\lambda$ . An observer moves from one source to other with velocity u. Then number of beats heared by him :

asked Jul 20, 2018 by pady_1

1 answer

The value of quality factor is :

asked Jul 20, 2018 by pady_1

1 answer

A charge having q/m equal to $10^8$ c/kg and with velocity $3 × 10^5$ m/s enters into a uniform magnetic field $B = 0.3$ tesla at an angle $30^{\circ}$ with direction of field. Then radius of curvature will be :

asked Jul 20, 2018 by pady_1

1 answer

For adjoining fig., The magnetic field at point, 'P' will be : 5A P 2.5A 2.5 m 5m

asked Jul 20, 2018 by pady_1

1 answer

A charge Q the electric flux passed through all the six faces of the cube is :

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1 answer

By photo electric effect, Einstein proved :

asked Jul 20, 2018 by pady_1

0 answers

For a plane convex lenx $(\mu = 1.5)$ has radius of curvature 10 cm. It is silvered on its plane surface. Find focal length after silvering :

asked Jul 20, 2018 by pady_1

1 answer

Gravitational force is required for :

asked Jul 20, 2018 by pady_1

1 answer

Rainbow is formed due to :

asked Jul 20, 2018 by pady_1

1 answer

A body of weight 72 N moves from the surface of earth at a height half of the radius of the earth, then gravitational force exerted on it will be :

asked Jul 20, 2018 by pady_1

2 answers

A man is slipping on a frictionless inclined plane & a bag falls down from the same height. Then the speed of both is related as :

asked Jul 20, 2018 by pady_1

1 answer

For the given reaction, the particle X is : ${6^C}^{11}\rightarrow{5^B}^{11}+\beta^+{+}X$

asked Jul 20, 2018 by pady_1

1 answer

A mass is performing vertical circular motion (see figure).If The average velocity of the particle is increased, then at which point the string will break :

asked Jul 20, 2018 by pady_1

1 answer

Two projectiles of same mass and with same velocity are thrown at an angle 60º & 30º with the horizontal, then which quantity will remain same :

asked Jul 20, 2018 by pady_1

1 answer

What happens in light reaction (Photo chemical reaction ) :

asked Jul 20, 2018 by pady_1

1 answer

Role of enzyme in reactions :

asked Jul 20, 2018 by pady_1

1 answer

Lysosome contains :

asked Jul 20, 2018 by pady_1

1 answer

A student observed an algae with chl. 'a' 'd' and phycoerythrin it should belong to :

asked Jul 20, 2018 by pady_1

1 answer

Which of the following is used to manufacture ethanol from starch :

asked Jul 20, 2018 by pady_1

1 answer

Extranuclear DNA is found in :

asked Jul 20, 2018 by pady_1

2 answers

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