Chemistry (25) Full Length

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PHYSICS

No of Questions
75
No of Questions
75
No of Questions
75
No of Questions
75
No of Questions
75

PHYSICS

No of Questions
75
No of Questions
75
No of Questions
75
No of Questions
75
No of Questions
75
Q 1.

The mechanism of \(S_N1\) reaction is given as:

A student writes general characteristics based on the given mechanism as :

(a) The reaction is favoured by weak nucleophiles.            (b) \(R^+\) would be easily formed if the substituents are bulky 

(c) The reaction is accompanied by recemization              (d) The reaction i`s favoured by non-polar solvents.   

 Which observations are correct ?








Q 2.

The figure that is not a direct manifestation of the quantum nature of atom is :

 








Q 3.

The incorrect statement(s) among (a) – (b) regarding acid rain is (are):

(a) It can corrode water pipes

(b) It can damage structures made up of stone.

(c) It cannot cause respiratory ailments in animals

(d) It is not harmful for trees

 








Q 4.
For the reaction \(2A+3B+{3\over2}C\rightarrow3P\), which statement is correct?






Q 5.
Which one of the following graphs is not correct for ideal gas ?






Q 6.
The atomic number of the element unnilennium is :






Q 7.
The five successive ionization enthalpies of an element are 800, 2427, 3658, 35024 and 32824 kJ \(mol^{-1}\) . The number of valence electrons in the element is:






Q 8.







Q 9.
Thermal power plants can lead to :






Q 10.
The increasing order of the reactivity of the following compounds in nucleophile addition reaction is: Propanal, Benzaldehyde, Propanone, Butanone






Q 11.
On heating compound (A) gives a gas (B) which is a constituent of air. This gas when treated with \(H_2\) in the presence of a catalyst gives another gas (C) which is basic in nature. (A) should not be :






Q 12.
In a molecule of pyrophosphoric acid, the number of P – OH, P = 0 and P – O – P bonds/moiety(ies) respectively are :






Q 13.
100 mL of 0.1 M HCl is taken in a beaker and to it 100 mL of 0.1 M NaOH is added in steps of 2 mL and the pH is continuously measured. Which of the following graphs correctly depicts the change in pH?






Q 14.
Which of the following compounds will show retention in configuration on nucleophile substitution by OH– ion ?






Q 15.
Let \(C_{naCl}\) and \(C_{BaSO_4}\) be the conductances (in S) measured for saturated aqueous solutions of \(NaCl\) and \(BaSO_4\) respectively, at a temperature T. Which of the following is false?






Q 16.

The decreasing order of reactivity of the following compounds towards nucleophilic substitution \(S_N2\) is:








Q 17.







Q 18.
An acidic buffer is obtained on mixing :






Q 19.

The strengths of 5.6 volume hydrogen peroxide (of density 1 g/mL) in terms of mass percentage and molarity (M) respectively, are: (Take molar mass of hydrogen peroxide as 34 g/mol)                                                                                (Take molar mass of hydrogen peroxide as 34 g/mol)








Q 20.
In Carius method of estimation of halogen, 0.172 g of an organic compound showed presence of 0.08 g of bromine. Which of these is the correct structure of the compound ?






Q 21.

The mass of gas adsorbed, \(X\), per unit mass of adsorbate, \(m\), was measured at various pressures, p. A graph between \(log{x\over m}\)and log p gives a straight line with slope equal to 2 and the intercept equal to 0.4771. The value of \(\frac x m\) at a pressure of 4 atm is :                                                                                  (Given log 3 = 0.4771)


Q 22.

The total number of monohalogenated organic products in the following (including stereoisomers) reaction is__________.


Q 23.
An acidic solution of dichromate is electrolyzed for 8 minutes using 2A current. As per the following equation \(Cr^2O_7^2+14\;H^++6e^-\rightarrow2C^{3+}+7H_2O\) The amount of Cr3+ obtained was 0.104 g. The efficiency of the process (in%) is (Take : F = 960000 C, At. mass of chromium = 52)
Q 24.
The internal energy change (in J) when 90 g of water undergoes complete evaporation at 100ºC is…………… (Given :\(\Delta H_{vap}\;for \;water\;at\ 373\;K=41kJ/mol,\ R\ =8.314\ JK^{-1}mol^{-1}\) )
Q 25.
The mole fraction of glucose \((C_6H_{12}O_6)\) in an aqueous binary solution is \(0.1\). The mass percentage of water in it, to the nearest integer, is ………
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