DCE CEE Previous Year Paper 2009 - JEE MCQ

Given the following sequence of reaction

The major product ‘C’ is :
 

Which is not the correct order for the stated property? ​

For square planar complex of platinum (II), [Pt(NH₃)(Br)(Cl)Py] ⁰ , how many isomeric forms are possible ?

In pyrophosphoric acid, H4P2O7, number of σ-and dπ-pπ bonds respectively: ​

A 5% solution of sugarcane (Mol wt = 342) is isotonic with 1% solution of X under similar conditions. The mol. wt of X is: ​

Perxenate ion is : ​

For a reaction between A and B, the initial rate of reaction is measured for various initial concentration of A and B. The data provided are:

The overall order of the reaction is:
 

SF₂, SF₄ and SF₆ have the hybridisations at sulphur atom respectively as: ​

For AB bond if percent ionic character is plotted against electronegativity difference (XA – XB). The shape of the curve would look like:

The correct curve is: ​

If the various terms in the below given expressions have usual meanings, the Van’t Hoff factor (i) cannot be calculated by which one of the following expressions:
 

In which pair of species, both species do have the similar geometry ? ​

In which reaction there will be increase in entropy? ​

For the reaction A → B ; ∆H = +24kJ / mole. For the reaction B → C ; ∆H = -18kJ / mole. The decreasing order of enthalpy of A, B, C follows the order: ​

Freundlich equation for adsorption of gases (in amount of X g) on a solid (in amount of m g) at constant temperature can be expressed as: ​

The number of isomeric pentyl alcohols possible are : ​

Strongest base is:

If liquid is dispersed in solid medium, then this is called as:​

In forming (i) N2 → N2 + and (ii) O2→ O2 + ; the electrons respectively are removed from
 

For the given complex [CoCl₂(en)(NH₃)₂] +, the number of geometrical isomers, the number of optical isomers and total number of isomers of all type possible respectively are:

The following two reactions of HNO₃ with Zn are given as (Equations are not balanced) Zn + conc.HNO₃ → Zn(NO₃)₂ + X + H₂O (A) Zn + dilute.HNO₃ → Zn(NO₃)2 + Y + H₂O (B) In reactions A and B, the compounds X and Y respectively are:

For H2 , the best three-dimensional view is :

Small quantities of solution of compounds TX, TY and TZ are put into separate test tubes containing X, Y and Z solution. TX does not react with any of these. TY reacts with both X and Z. TZ reacts with X. The decreasing order of case of oxidation of the anions X – , Y – , Z – is:​

When copper pyrites is roasted in excess of air, a mixture of CuO + FeO is formed. FeO is present as impurities. This can be removed as slag during reduction of CuO. The flux added to form slag is: ​

If k1 = Rate constant at temperature T1 and k2 = Rate constant at temperature T2 for a first order reaction, then which of the following relations is correct? (Ea : activation energy)

In the reaction for dinitration

The major dinitrated product ‘X’ is :

The number of unpaired electrons in gaseous species of Mn 3+, Cr 3+ and V 3+ respectively are............and most stable species is ............ ​

For a chemical reaction, ∆G will always be negative if : ​