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

Q:

Atomic number of which of the following elements is greater than that of Zinc

A) Copper	B) Iron
C) Chromium	D) Bromine

Answer & Explanation Answer: D) Bromine

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Q:

Which of the following statements about the reaction below are INCORRECT?

$2 Pb + C \to 2 Pb + {CO}_{2}$

A. Carbon di-oxide is getting, oxidised
B. Lead is getting reduced
C. Carbon is oxidised
D. Lead oxide is getting reduced

A) A and C	B) A and B
C) B and C	D) A, B and C

Answer & Explanation Answer: B) A and B

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Q:

A solution contains 33 g of common salt in 320 g of water. Calculate the concentration in terms of mass, by mass percentage of the solution.

A) 13.05%	B) 9.09 g
C) 9.35g	D) 9.35%

Answer & Explanation Answer: D) 9.35%

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Q:

............ element is represented by the given symbol.

A) Hydrogen	B) Mercury
C) Carbon	D) Gold

Answer & Explanation Answer: B) Mercury

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Q:

Calculate the relative molecular mass of water $H_{2} O$ ?

A) 18u	B) 1.8u
C) 2.0u	D) 20u

Answer & Explanation Answer: A) 18u

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Q:

Potassium Permanganate is used for purifying drinking water, because________

A) It is a reducing agent	B) It is an oxidising agent
C) It is a sterilising agent	D) It dissolves the impurities of water

Answer & Explanation Answer: B) It is an oxidising agent

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Q:

Which is the only non-metal placed at the left side of the Modern Periodic Table?

A) Hydrogen	B) Carbon
C) Neon	D) Helium

Answer & Explanation Answer: A) Hydrogen

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Q:

There are ............ metalloids in the modern periodic table.

A) 5	B) 4
C) 7	D) 6

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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