In modern periodic table while going from top to b | Chemistry Questions & Answers

Q:

Which one of the following is used to induce artificial rain ?

A) Potassium Nitrate	B) Ammonium chloride
C) Calcium carbonate	D) Silver lodide

Answer & Explanation Answer: D) Silver lodide

Explanation:

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20 10061

Q:

A ‘breath test’ used by traffic police to check drunken driving uses ____?

A) Turmeric on filter paper	B) Silica gel coated with silver nitrate
C) potassium permanganate-sulphuric acid	D) Potassium dichromatic-sulphuric acid

Answer & Explanation Answer: D) Potassium dichromatic-sulphuric acid

Explanation:

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Q:

The enzyme that converts glucose to ethyl alcohol is

A) Maltase	B) Zymase
C) Diastase	D) Invertase

Answer & Explanation Answer: B) Zymase

Explanation:

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96 23386

Q:

The presence or absence of hydroxy group on which carbon atom of sugar differentiates RNA and DNA ?

A) 4th	B) 2nd
C) 3rd	D) 1st

Answer & Explanation Answer: B) 2nd

Explanation:

RNA has hydroxy group attached at the 2nd C-atom while DNA does not.

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Q:

'Minamata' disease was caused by ?

A) Lead	B) Mercury
C) Cadmium	D) Zinc

Answer & Explanation Answer: B) Mercury

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11 4819

Q:

Which one of the following orders presents the correct sequence of the increasing basic nature of the given oxides?

(1) $K_{2} O < N a_{2} O < A l_{2} O_{3} < M g O$

(2) $A l_{2} O_{3} < M g O < N a_{2} O < K_{2} O$

(3) $M g O < K_{2} O < A l_{2} O_{3} < N a_{2} O$

(4) $N a_{2} O < K_{2} O < M g O < A l_{2} O_{3}$

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

Answer & Explanation Answer: B) Option 2

Explanation:

While moving from left to right in periodic table basic character of oxide of elements will decrease.

$∴ \to_{I n c r e a \sin g b a s i c s t r e n g t h}^{A l_{2} O_{3} < M g O < N a_{2} O}$

and while descending in the group basic character of corresponding oxides increases.

$∴ \to_{I n c r e a \sin g b a s i c s t r e n g t h}^{N a_{2} O < K_{2} O}$

$∴ C o r r e c t O r d e r i s A l_{2} O_{3} < M g O < N a_{2} O < K_{2} O$

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Q:

Boron cannot form which one of the following anions?

(1) $B O_{2}^{-}$

(2) $B F_{6}^{3 -}$

(3) $B H_{4}^{-}$

(4) $B (O H)_{4}^{-}$

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

Answer & Explanation Answer: B) Option 2

Explanation:

Due to absence of low lying vacant d orbital in B, $s p^{3} d^{2}$ hybridization is not possible hence $B F_{6}^{3 -}$ will not formed.

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Q:

Among the following the maximum covalent character is shown by the compound

(1) $M g C l_{2}$

(2) $F e C l_{2}$

(3) $S n C l_{2}$

(4) $A l C l_{3}$

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

Answer & Explanation Answer: D) Option 4

Explanation:

According to Fajans rule, cation with greater charge and smaller size favours covalency.

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A) size of an atom increases	B) size of an atom decreases
C) ionisation energy of an atom increases	D) size and ionisation energy of an atom increases

In modern periodic table while going from top to bottom in a group ______.

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