Chemistry Test 180

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Chemistry Test 180

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Weekly Quiz Competition

Question 1
4 / -1

A gaseous compound of nitrogen and hydrogen contains 12.5% (by mass) of hydrogen. The density of the compound relative to hydrogen is 16. The molecular formula of the compound is:

A
NH₂

B
N₃H

C
NH₃

D
N₂H₄

Solution

In an unknown compound containing N and H
Question 2
4 / -1

The de Broglie wavelength of a car of mass 1000 kg and velocity 36 km/hr is :

A

B

C

D

Solution
Question 3
4 / -1

Among Al₂O₃, SiO₂, P₂O₃ and SO₂ the correct order of acid strength is

A
Al₂O₃ < SiO₂< SO₂ < P₂O₃

B
SiO₂< SO₂ < Al₂O₃ < P₂O₃

C
SO₂< P₂O₃ < SiO₂ < Al₂O₃

D
Al₂O₃ < SiO₂< P₂O₃ < SO₂

Solution
Question 4
4 / -1

Which one of the following pairs of species have the same bond order?

A

B

C

D

Solution

For any species to have same bond order we can expect them to have same number of electrons. Calculating the number of electrons in various species.

We find CN^– and NO⁺ both have 14 electrons so they have same bond order.

Correct answer is (a).
Question 5
4 / -1

By how many folds the temperature of a gas would increase when the root mean square velocity of the gas molecules in a container of fixed volume is increased from

A
2

B
3

C
6

D
4

Solution
Question 6
4 / -1

Bond enthalpies of H₂, X₂ and HX are in the ratio 2 : 1 : 2. If enthalpy of formation of the bond enthalpy of X₂ is

A

B

C

D

Solution
Question 7
4 / -1

Which equilibrium can be described as an acid-base reaction using the Lewis acid-base definition but not using the Bronsted-Lowry definition?

A

B

C

D

Solution

Involves lose and gain of electrons. H₂O is coordinated to Cu by donating electrons (LHS). It is then removed by withdrawing electrons.
Question 8
4 / -1

Which of the following reactions depict the oxidising behaviour of H₂SO₄

A

B

C

D

Solution
Question 9
4 / -1

Very pure hydrogen (99.9) can be made by which of the following processes?

A
Reaction of methane with steam

B
Mixing natural hydrocarbons of high molecular weight

C
Electrolysis of water

D
Reaction of salts like hydrides with water

Solution
Question 10
4 / -1

Which of the following are found in biological fluids

A

B

C

D

Solution

Monovalent sodium and potassium ions and divalentmagnesium calcium ions are found in largeproportions in biological fluids.