7. Which of the followiNG structures are symetrical? A xef4 B xef6 C so2 D NH3(+2) Options 1 A and B 2 b and c 3 c and d 4 a and d

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Q. Match the Xenon compound in Column-I with its structure in Column-II and assign the correct code:

Column - I	Column - II
1. $X e F_{4}$	a. Pyramidal
2. $X e F_{6}$	b. Square planar
3. $X e O F_{4}$	c. Distorted octahedral
4. $X e O_{3}$	d. Square pyramidal

Q. Select the correct option of endocrine gland and their hormones from the options given below:

\begin{matrix} A & Pineal gland & 1 & Epinephrine hormone B & Thyroid gland & 2 & Melatonin hormone C & Ovary & 3 & Estrogen hormone D & Adrenal medulla & 4 & Tetraiodothyronine hormone \end{matrix}

Match the following with repect to glands and disease

$\begin{matrix} A. Addison's disease & 1. Pituitary B. Tetany & 2. Thyroid C. Acromegaly & 3. Adrenal cortex D. Myxoedema & 4. Parathyroid. \end{matrix}$

Match the enzyme with their respective substrate and choose the right one among options given
$\begin{matrix} C o l u m n I & C o l u m n I I A . & Lipase & 1. & Dipeptides B . & Nuclease & 2. & Fats C . & Carboxypeptidase & 3. & Nucleic acids D . & Dipeptidases & 4. & Proteins, peptones and proteoses \end{matrix}$
Codes
(a) A-2, B-3, C-1, D-4 (b) A-3, B-4, C-2, D-1
(a) A-3, B-1, C-4, D-2 (d) A-2, B-3, C-4, D-1

Q. A, B, C and D are four angles at a point so that

A + B + C + D =

4 right angles, out of these A and B are acute angles while C and D are obtuse angles. Which of the following relations may be true
1.

A + B = C + D

A + C = B + D

A + D = B + C

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