Chemistry Test 186

Result

Chemistry Test 186

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Weekly Quiz Competition

Question 1
4 / -1

A
0.167

B
0.6

C
0.2

D
0.4

Solution
Question 2
4 / -1

The correct set of four quantum numbers for the valence electrons of rubidium atom (Z = 37) is:

A
5,0,0, +1/2

B
5,1,0, +1/2

C
5,1,1, +1/2

D
5, 0, 1, +1/2

Solution
Question 3
4 / -1

Which of the following statements is wrong ?

A
van der Waal’s radius of iodine is more than its covalent radius

B
All isoelectronic ions belong to same period of the periodic table

C
of N is higher than that of O while of O is higher than that of N

D
The electron gain enthalpy of N is almost zero while that of P is 74.3 kJ

Solution

In the isoelectronic species, all isoelectronic anions belong to the same period and cations to the next period.
Question 4
4 / -1

Amongst LiCl, RbCl, the compounds with the greatest and the least ionic character, respectively are:

A
LiCl and RbCl

B
RbCl and

C

D

Solution

According to Fajan’s rules smaller, highly charged cation has greatest covalent character while large cation with smaller charge has greatest ionic character.
Question 5
4 / -1

56 g of nitrogen and 96 g of oxygen are mixed isothermally and at a total pressure of 10 atm. The partial pressures of oxygen and nitrogen (in atm) are respectively

A
4, 6

B
5, 5

C
2, 8

D
6, 4

Solution
Question 6
4 / -1

Temperature of 5 moles of a gas is decreased by 2K at constant pressure. Indicate the correct statement

A
Work done by gas is = 5 R

B
Work done over the gas is = 10 R

C
Work done by the gas = 10 R

D
Work done = 0

Solution
Question 7
4 / -1

Zirconium phosphate dissociates into three zirconium cations of charge + 4 and four phosphate anions of charge – 3. If molar solubility of zirconium phosphate is denoted by S and its solubility product by K_sp then which of the following relationship between S and K_sp is correct?

A

B

C

D

Solution
Question 8
4 / -1

Thiosulphate reacts differently with iodine and bromine in the reactions given below.

Which of the following statements justifies the above dual behaviour of thiosulphate?

A
Bromine is a stronger oxidant than iodine

B
Bromine is a weaker oxidant than iodine

C
Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reactions

D
Bromine undergoes oxidation and iodine undergoes reduction in these reactions

Solution
Question 9
4 / -1

Which statement is wrong?

A
Ordinary hydrogen is an equilibrium mixture of ortho and para hydrogen

B
In ortho hydrogen spin of two nuclei is in same direction

C
Ortho and para forms do not resemble in their chemical properties

D
In para hydrogen spin of two nuclei is in opposite direction.

Solution

Ortho and para forms of hydrogen resemble in their chemical properties.
Question 10
4 / -1

A firework gives out crimson coloured light. It contains a salt of

A
Ca

B
Na

C
Sr

D
Ba