JUPEB 2019 CHEMISTRY – Multiple Choice Questions

Precision in measurement is _____________

Which of the following is not an assumption of Bohr’s model of an atom?

The following factors influence ionization energies except ________

The energy associated with the process below is called ___________ Li(g) Li⁺(g) + e^–

The condensed  electronic configuration of Zn²⁺ (Z=30) is __________

All the following are attributes of light except

Which of the following is not true of the electromagnetic spectrum?

A base is a proton acceptor, according to ________

A bottle of concentrated hydrochloric acid solution has a label reading “37.8% HCI by mass”. Calculate the molarity of this solution if it has a density of 1.1917g cm³ (H=1.0; CI = 35.5)

State the change in oxidation number of sulphur in the redox reaction below:

I₂ + 2S₂O₃² 2I + S₄O₇²

What is the percent carbon in the glutamic acid, C₅H₈N0₄?

[0=12.01; H=1.01;N=14.0; 0=16.00]

Which of the following elements exhibit a diagonal relationship with aluminum?

Nitrogen dioxide decomposes on heating according to the following equation:

2N0₂(g) 2NO(g) + 0₂(g)

When 4 mol of nitrogen dioxide was put into a 1dm³ container and heated to a constant temperature, the equilibrium mixture contained 0.8 mol of oxygen, What is the numeral value of the equilibrium constant, Kc, at the temperature of the experiment?

In which of the following reaction is the change in entropy positive?

A system in which only energy is transferred between the system and the surroundings is _____

Which of these orbitals is the most stable?

Identify the species A in the radioactive reaction represented by the equation below:

²³⁸₉₀Th + A  ²³⁸₉₂ U

Arrange the following elements in order of decreasing reducing power Na, Rb, K, Cs

Hydride of the halogens with the highest stability to heat is ________

Hydrocarbons which react with ammonical copper (I) chloride solution conform to the general molecular formula __________

In the coordination compounds, [Co(NH₃)₆] [FeCl₄]x, if the primary valences of Co and Fe are both +3, what is x?

Which of the following is TRUE about sodium chloride in the solid-state?

A method of preventing corrosion that involves coating steel with zinc metal is called

Which type of radioactive decay produces a daughter nucleus with a higher atomic number?

For a reaction that is second order with respect to a reactant, A how many times does the rate increased as [A] increases by a factor of 2?

What is the number of atoms present in 21.6g of Ag?

[Ag = 108 gmol^-1 N_A = 6.023 x 10²³ mol^-1]

Transition metal atoms without unpaired electrons are said to be ______

Strontium is an element in Group 2 of the periodic table.  Which of the following statements above strontium is NOT correct?

Why is the melting point of diamond much-higher than that of graphite?

The oxidation state of Au in K[Au(OH)₄] is _____________

Which of the following is NOT true of a catalyst?

Which of the following will always produce a spontaneous reaction?

In the electrolysis of brine (concentrated NaCl) using mercury as the cathode, the components produced and  resulting  solution  are ______, _____  and  _______            respectively.

The IUPAC name of K₂[PtCl₆] is

Given that the standard enthalpy changes of formation of Ti0₂(s) and CO(g) are -940 kJ mol”¹ and -110 kJ morl respectively. What is the standard enthalpy change (kJ/mol) of the reaction?

Ti0₂(s) + 2C(s) Ti(s) + 2CO(g).

The reaction ire C₁₂H₂₀0₁₀ + H₂0     2 C ₆ H ,- ₂ O₆ represents __________

The shape and bond angle of the sp² hybridized orbital are

Calculate the volume of oxygen evolved at 285K and 0.91 x 10⁵Nm”² when a current of 2.5A is passed through acidified water for 1.5mins.

[Molar volume of a gas is 22.4dm³; standard pressure = 1.01 x 10⁵ Nm^-2; l Faraday=96500C].

Which of the following group of compounds forms a layer of silver when reacted with silver trioxonitrate (V) in the presence of excess ammonia?

Which of the following compounds is NOT a functional group isomer of CH₂OHCH₂CHO?

Which of the following is the final product from the reaction of ethyne with hydrogen bromide?

The IUPAC name for CH₃CH₂CH₂CHC1CH₃ is __________

In Benedicts test, a positive test is indicated by a colour change from ___________

The IUPAC name for the compound below is

Given below are sets of homologous series, identify the set that contains a carbonyl group:

There is free rotation about the carbons of ethane but not that of ethene. This is due to the fact that ________

H₃C-Br CH₃⁺+Bf^–

The above equation shows _________

$\mathrm{Which} \mathrm{group} \mathrm{of} \mathrm{compounds} \mathrm{produce} \mathrm{yellow} \mathrm{crystals} \mathrm{of} {\mathrm{CHI}}_3 \mathrm{in} \mathrm{the} \mathrm{presence} \mathrm{of} \frac{{\mathrm{I}}_2}{\mathrm{NaOH}}?$

Identify  P  in  the   reaction  C₂H₅MgBr  +  P    (H20/TT) C₂H₅C(OH)(CH₃)C₃H₇

What is the major product of the following reaction?