1099+ Important Chemistry MCQ Questions Answers

Q:

Trichloroacetaldehyde was subject to Cannizzaro's reaction by using NaOH. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is :

A) Chloroform	B) 2, 2, 2-Trichloroethanol
C) Trichloromethanol	D) 2, 2, 2-Trichloropropanol

Answer & Explanation Answer: B) 2, 2, 2-Trichloroethanol

Explanation:

$\begin{matrix} C l \\ | \\ C l & - & C & - & C H O \\ | \\ C l \end{matrix}$ $\to_{C a n n i z z a r o' s R e a c t i o n}^{N a O H}$ $\begin{matrix} C l \\ | \\ C l & - & C & - & C O O N a \\ | \\ C l \end{matrix}$ $+$ $\begin{matrix} C l \\ | \\ C l & - & C & - & C H_{2} \\ | 2 & 1 \\ C l \end{matrix}$ $- O H$

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Q:

A by product of involuntary muscle contraction and relaxation is

A) Oxygen	B) Water
C) Heat	D) Nitrogen

Answer & Explanation Answer: C) Heat

Explanation:

A_by_product_of_involuntary_muscle_contraction_and_relaxation_is1537166589.jpg image

When a muscle is contracted and relaxed some amount of heat is released as a by product.

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Q:

Dry distillation of calcium formate gives

A) HCOOH	B) CH3COOH
C) HCHO	D) CH3CHO

Answer & Explanation Answer: C) HCHO

Explanation:

Dry distillation of calcium acetate and calcium formate leads to the formation of aldehydes and ketones.

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Q:

What is the systematic name of ${NH}_{4} {ClO}_{3}$ ?

A) Ammonium Chloride	B) Ammonium Chlorate
C) Ammonium Chlorane	D) Ammonium Chlorine

Answer & Explanation Answer: B) Ammonium Chlorate

Explanation:

In common we all call the systematic name of $N H_{4} C l O_{3}$ as Ammonium Chlorate. But originally the systematic name is azanium trioxidochlorate.

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Q:

According to the modern Periodic Law, the properties of elements are periodic functions of their

A) volency	B) atomic mass
C) number of neutrons	D) atomic number

Answer & Explanation Answer: D) atomic number

Explanation:

Atomic number is the serial number of an element in the periodic classification of elements. It gives the number of protons and also the number of electrons in an atom.

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Q:

A bond formed by the transfer of electrons betwwen atoms of the elements is called

A) ionic bond	B) covalent bond
C) co ordinate bond	D) none

Answer & Explanation Answer: A) ionic bond

Explanation:

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Q:

Group displacement law was given by

A) Bacquerel	B) Rutherford
C) Mendeleaf	D) Soddy and Fajan

Answer & Explanation Answer: D) Soddy and Fajan

Explanation:

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Q:

Which compound matches the IR Spectrum?

Which_compound_matches_the_IR_Spectrum11562648897.png image

A) 3 – Hexanol	B) Trans – 4 – Octene
C) 1, 5 – Hexadiene	D) None of the above

Answer & Explanation Answer: C) 1, 5 – Hexadiene

Explanation:

Infrared spectroscopy involves the interaction of infrared radiation with matter. It is used by chemists to determine functional groups in molecules. IR Spectroscopy measures the vibrations of atoms, and based on this it is possible to determine the functional groups.

Here in the given spectrum, there is no alcohol stretch present in the spectrum. There is no vinyl bending present in the spectrum.

Hence, both options B and C are compounds that are not matching with IR spectrum. 1, 5 – Hexadiene is the compound matches the IR Spectrum.

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