Chemistry Test - 6

Silica is added to roasted copper ore during smelting in order to remove

The reaction  is fastest when X is

Which of the following pairs of structures is an example of diastereomers ?

16 g of an ideal gas SO_x occupies 5.6 L at STP. The value of x for this gas is

  . IUPAC name of the compound is

When a certain conductivity cell was filled with 0.01 M solution of KCl, it had a resistance of 160 ohm at 25⁰C and when filled with 0.005 M NaOH, it had a resistance of 190 ohm. If specific resistance of KCl solution is 700 ohm cm, specific conductance (ohm^-1 cm^-1) of NaOH solution is

A buffer solution contains 100 mL of 0.01 M CH₃COOH and 200 mL of 0.02 M CH₂COONa. 700 mL of water is added to this solution . pH before and after dilution are (pK_a = 4.74)

Arrange the following compounds in decreasing order of basicity
I. ethylamine
II. 2-amino ethanol
III. 3-amino-1-propanol

One gram of hydrogen and 112 g of nitrogen are enclosed in two separate containers each of volume 5 L at 27⁰C. If the pressure of hydrogen is 1 atm, the pressure of nitrogen would be

Ozonolysis products of an olefin are   and   Olefin is

Following is the concentration cell in which electrode is reversible with respect to anion

  . The cell reaction is spontaneous, if

Consider the following reactions

A and B are respectively

The correct name for the complex ion [Co(en)₂Cl(ONO)]⁺ is

A laboratory reagent imparts green colour to the flame. On heating with solid K₂Cr₂O₇ and conc. H₂SO₄, it evolves an orange red gas. Identify the reagent.

van’t Hoff factors are x, y and z in case of association, ionisation and no change, respectively. Their increasing order is

Which of the following does not illustrate the anomalous properties of Li ?

If for a reaction A → B, ΔH = -10 kJ mol^-1 and E_a = 50 kJ mol^-1, the energy of activation for reaction B → A will be

NaAlH₄ reduces an ester into HCHO and (CH₃)₂CHOH. Thus, ester is

Reduction of a metal oxide by excess carbon at high temperature is a method for the commercial preparation of some metals. This method can be successfully applied in the case of

What is the repeating unit in nucleic acids ?

Elevation in boiling point of an aqueous urea solution is 0.52⁰(k_b = 0.52⁰ mol^-1 kg). Hence, mole fraction of urea in this solution is

For the reaction, 2Fe³⁺ + Fe → 3Fe²⁺ , E⁰ = 1.21 V, hence

A 100 mL sample is removed from water solution saturated with CaSO₄ at 25⁰C. The water is completely evaporated from the sample and a deposit of 0.24 g CaSO₄ is obtained. The K_sp of CaSO₄ at 25⁰C is

Match the following lists
List I                          List II
A. Benzene               1. Phosgene
B. Ethylene               2. Silver mirror
C. Acetaldehyde       3. Mustard gas
D. Chlororform          4. (4n + 2)π electrons
                                 5. Carbylamine

The correct answer is

In a transition series, as the atomic number increases, paramagnetism

When FeS₂ is burnt in air, it converts to Fe₂O₃. The change in percentage by weight of iron in the process is (Fe = 56)

Which of the following pairs of liquid form an emulsion ?