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Q:

Which of the following reactions are exothermic?

 

1)   C + O2  → CO22)  2Mg + O2  → 2MgO3)  CuSO4 + 5H2O  → CuSO4.5H2O4)  All the above

A) 1 B) 2
C) 3 D) 4

Answer:   D) 4



Explanation:

Here all the given options are Exothermic reactions. Exothermic reactions are those reactions which involves the release of heat.

 

Generally all the combining reactions are exothermic in nature.

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Hydrophilic molecules readily associate with

A) water B) alcohols
C) both A & B D) none of the above
 
Answer & Explanation Answer: C) both A & B

Explanation:

Hydrophilic molecules readily associate with water molecules and water like molecules such as alcohols.

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Which molecule contains a nonpolar covalent bond?

A) Cl2 B) Br2
C) H2 D) All of the above
 
Answer & Explanation Answer: D) All of the above

Explanation:

In all the given options, molecules are containing nonpolar covalent bonds.

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Hydrogen bonds and hydrophilic interactions are

A) Strong chemical bonds that hold together the atoms within a molecule B) Weak chemical bonds that hold together the atoms within a molecule
C) Strong chemical bonds that link together separate molecules D) Weak chemical bonds that link together separate molecules
 
Answer & Explanation Answer: D) Weak chemical bonds that link together separate molecules

Explanation:
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1 1665
Q:

The reactivity of an atom arises from

A) the existence of unpaired electrons in the valence shell B) the potential energy of the valence shell
C) the average distance of the outermost electron shell from the nucleus D) the sum of the potential energies of all the electron shells
 
Answer & Explanation Answer: A) the existence of unpaired electrons in the valence shell

Explanation:

The reactivity of an atom arises from the existence of unpaired electrons in the valence shell.

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Technically, tempera is paint in which the vehicle is in

A) an emulsion B) a pigment
C) an impasto D) a ground
 
Answer & Explanation Answer: A) an emulsion

Explanation:
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0 2363
Q:

The bonds in the compound MgSO4 can be described as

A) covalent B) ionic
C) both A & B D) None of the above
 
Answer & Explanation Answer: C) both A & B

Explanation:

Here the given compound is MgSO4.

In the given compound, Sulphur (S) and Oxygen (O) are two non metals and Magnesium (Mg) is a metal.

In this compound, Sulphur and Oxygen reacts to form covalent bond and the metal Magnesium reacts with both non metals Sulphur and Oxygen to form ionic bonds.

 

Hence, in the given compound MgSO4 there are both covalent and ionic bonds.

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Q:

ATP generally energizes a cellular process by

A) direct chemical transfer of a phosphate group B) becoming oxidized
C) releasing heat upon hydrolysis D) direct chemical transfer of a sugar group
 
Answer & Explanation Answer: A) direct chemical transfer of a phosphate group

Explanation:

ATP generally energizes a cellular process by direct chemical transfer of a phosphate group.

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2 2370
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Which group 4A element has the highest ionization energy?

A) Silicon B) Tin
C) Lead D) Carbon
 
Answer & Explanation Answer: D) Carbon

Explanation:

As the ionization energies of the elements decreases down the group carbon has got the highest ionization energy in the group being at the top of the group.

Carbon is on the top of the group 4 among the given elements. Hence, Carbon has the highest ionization energy.

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