Recent questions in 2001

If a $_a^b X$ species emits firstly a positron, then two $\alpha$ and two $\beta$ and at last one $\alpha$ is also after intially it fainally convets into stable $_d^cY$ species so correct relation will be : -

asked Jul 20, 2018 by pady_1

1 answer

Solubility of a $M_2S$ salt is $3.5 \times 10^{–6}$ then find out solubility product : -

asked Jul 20, 2018 by pady_1

1 answer

Ionisation constant of $CH_3COOH$ is $1.7 \times 10^{–5}$ and concentration of $H^+$ ions is $3.4 \times 10^{–4}$ . Then find out initial concentration of $CH_3COOH$ molecules :-

asked Jul 20, 2018 by pady_1

1 answer

Nitrogen form $N_2$ , but phosphorous form $P_2$ , it's at a time convert in $P_4$ , reason is :

asked Jul 20, 2018 by pady_1

1 answer

Zn convert it's melted state to its solid state, it has HCP structure, then find out nearest no. of nearest atom : -

asked Jul 20, 2018 by pady_1

1 answer

The most convenient method to protect the bottom of ship made of iron is : -

asked Jul 20, 2018 by pady_1

1 answer

The Beans are cooked earlier in pressure cooker, because : -

asked Jul 20, 2018 by pady_1

1 answer

In $HS^–$ , $I^–$ , $R–NH_2, NH_3$ order of proton excepting tendency will be :-

asked Jul 20, 2018 by pady_1

1 answer

The following quantum numbers are possible for how many orbital n = 3, l = 2, m = +2

asked Jul 20, 2018 by pady_1

1 answer

Which of the following will exhibit maximum ionic conductivity : -

asked Jul 20, 2018 by pady_1

1 answer

Main axis of a diatomic molecule is z, molecular orbtial $p_x$ and $p_y$ overlaps to form, which of the following orbital : -

asked Jul 20, 2018 by pady_1

2 answers

In X- H ----- Y, X and Y both are electronegative elements :

asked Jul 20, 2018 by pady_1

1 answer

Which statement is incorrect : -

asked Jul 20, 2018 by pady_1

1 answer

Which of following organometallic compound is $\sigma$ and $\pi$ bonded : -

asked Jul 20, 2018 by pady_1

1 answer

Coordination number of $Ni$ in $[Ni(C_2O_4)_3] ^{4-}$ is

asked Jul 20, 2018 by pady_1

1 answer

Which of the following will give maximum number of isomers : -

asked Jul 20, 2018 by pady_1

1 answer

Correct order of $I^{st}$ IP among following elements Be, B, C, N, O is : -

asked Jul 20, 2018 by pady_1

1 answer

Which of the following statement is not correct

asked Jul 20, 2018 by pady_1

1 answer

In which of the following bond angle is maximum :

asked Jul 20, 2018 by pady_1

1 answer

Which of the following two species in the pair are isostructural :-

asked Jul 20, 2018 by pady_1

2 answers

$PbO_2 \to PbO \; \; \; \; \; \Delta G_{298} < 0$ $SnO_2 \to SnO \; \; \; \; \; \Delta G_{298} > 0$ Most probable oxidation state of Pb & Sn will be :

asked Jul 20, 2018 by pady_1

1 answer

Which is not correct regarding the adsorption of a gas on surface of solid: -

asked Jul 20, 2018 by pady_1

1 answer

Standard electrode potential are $Fe^{+2}/Fe\; \; \;$ $\;\; \;E^o = -0.44$ $Fe^{+3}/Fe^{+2} \; \; \;$ $\; \; \; E^o = 0.77$ If $Fe^{+2}, Fe^{+3}$ and $Fe$ block are kept together, than :-

asked Jul 20, 2018 by pady_1

1 answer

Pure water can be obtain from sea water by

asked Jul 20, 2018 by pady_1

1 answer

Specific volume of cylindrical virus particle is $6.02 \times 10^{–2} cc/gm$ . Whose radius and length are 7 Å & 10Å respectively. If $N_A = 6.02 \times 10^{23}$ . Find mol. wt. of virus : -

asked Jul 20, 2018 by pady_1

1 answer

Percentage of Se in peroxidase anhydrous enzyme is 0.5% by weight (at. wt = 78.4) then minimum molecular weight of peroxidase anhydrous enzymes is : -

asked Jul 20, 2018 by pady_1

1 answer

Molarity of liquid HCl if density of liq. HCl is 1.17 gm/cc : -

asked Jul 20, 2018 by pady_1

1 answer

When a bio chemical reaction is carried out in laboratory out side the human body in the absence of enzyme, then the rate of reaction obtained is $10^{–6}$ times, than activation energy of reaction in the presence of enzyme is : -

asked Jul 20, 2018 by pady_1

1 answer

A human body required the 0.01 Curie activity of radioactive substance after 24 hours. Half life of radioactive is 6 hours. Then max. activity of radioactive substance that can be injected will be : -

asked Jul 20, 2018 by pady_1

1 answer

For the reaction $2N_2O_5 \to 4NO_2 + O_2$ rate and rate constant are $1.02 \times 10^{–4}$ and $3.4 \times 10^{–5} sec^{–1}$ respectively.Then concentration of $N_2O_5$ at that time will be : -

asked Jul 20, 2018 by pady_1

1 answer

Enthalpy of $CH_4 + \frac{1}{2} O_2 \to CH_3OH$ is negative. If enthalpy of combustion of $CH_4$ and $CH_3OH$ and x and y respectively. Then which relation is correct : -

asked Jul 20, 2018 by pady_1

1 answer

When 1 mol gas is heated at constant volume temperature is raised from 298 to 308 K. Heat supplied to the gas is 500 J. Then which statement is correct : -

asked Jul 20, 2018 by pady_1

1 answer

Change in enthalpy for reaction $2 H_2O_2 (\ell) \to 2 H_2O (\ell) + O_2 (g)$ If heat of formation of $H_2O_2 (\ell)$ and $H_2O (\ell)$ are -188 & -286 KJ/mol respectively :-

asked Jul 20, 2018 by pady_1

1 answer

A compound of molecular formula is $C_7H_{16}$ shows optical isomerism, compound will be

asked Jul 20, 2018 by pady_1

1 answer

In steam distillation of toluene, the pressure of toluene in vapour is :-

asked Jul 20, 2018 by pady_1

1 answer

<img src= ""/> which statement is incorrect about peptide bond :-

asked Jul 20, 2018 by pady_1

1 answer

Which is correct statement :-

asked Jul 20, 2018 by pady_1

1 answer

Which of the following is correct about H- bonding in nucleotide :-

asked Jul 20, 2018 by pady_1

1 answer

Which of following is correct :-

asked Jul 20, 2018 by pady_1

1 answer

In preparation of alkene from alcohol using $Al_2O_3$ which is effective factor :-

asked Jul 20, 2018 by pady_1

1 answer

The incorrect IUPAC name is : -

asked Jul 20, 2018 by pady_1

1 answer

Which of the following is correct : -

asked Jul 20, 2018 by pady_1

1 answer

Which of the following is not correctly matched

asked Jul 20, 2018 by pady_1

1 answer

Which of following give positive Fehling solution test

asked Jul 20, 2018 by pady_1

1 answer

Which of the following is incorrect :-

asked Jul 20, 2018 by pady_1

1 answer

An organic compound $A(C_4H_9Cl)$ on reaction with $Na$ /diethyl ether gives a hydrocarbon which on monochlorination gives only one chloro derivative then, A is :-

asked Jul 20, 2018 by pady_1

1 answer

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asked Jul 20, 2018 by pady_1

1 answer

Which alkene on ozonolysis gives

asked Jul 20, 2018 by pady_1

1 answer

asked Jul 20, 2018 by pady_1

1 answer

The correct acidic order of following is : -

asked Jul 20, 2018 by pady_1

1 answer

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