Q:

Group 8A of the periodic table contains the

A) least reactive metals	B) most reactive nonmetals
C) most reactive metals	D) least reactive nonmetals

Answer & Explanation Answer: D) least reactive nonmetals

Explanation:

Helium (He), Neon(Ne), Argon(Ar), Krypton (Kr), Xenon (Xe), Radon (Rn) and Ununoctium (Uuo) are present group 8A.

They have fully filled orbitals and hence are most stable amongst all the elements in the periodic table and are considered as least reactive least reactive non-metals.

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1 52404

Q:

Elements having same atomic numbers but different mass number are called ______.

A) isotones	B) Isotopes
C) isomopes	D) isobar

Answer & Explanation Answer: B) Isotopes

Explanation:

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0 52402

Q:

Isobars are atoms of different chemical elements that have ______.

A) Same atomic number but different mass number	B) Same mass number but different atomic number
C) Same mass number and same atomic number	D) Different mass number and different atomic number

Answer & Explanation Answer: B) Same mass number but different atomic number

Explanation:

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0 52391

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

Explanation:

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1 52372

Q:

Which shows the order in which vertebrates evolved?

A) fish, reptiles, amphibians, birds, mammals	B) amphibians, fish, reptiles, birds, mammals
C) amphibians, fish, birds, reptiles, mammals	D) fish, amphibians, reptiles, birds, mammals

Answer & Explanation Answer: D) fish, amphibians, reptiles, birds, mammals

Explanation:

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Filed Under: Biology
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3 52338

Q:

What has teeth but cannot bite?

A) Comb	B) Saw
C) Zipper	D) Gear

Answer & Explanation Answer: A) Comb

Explanation:

Saw, Zipper and Gear have teeth but can bite us. Comb have teeth but cannot bite.

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126 52312

Q:

Which one of the following organisms is dependent on saprophytic mode of nutrition?

A) Agaricus	B) Ulothrix
C) Riccia	D) Cladophora

Answer & Explanation Answer: A) Agaricus

Explanation:

Saprophytic fungi feed on dead plant and animal remains. Many are extremely beneficial, breaking down this organic material into humus, minerals and nutrients that can be utilised by plants. Agaricus is one among them.

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Filed Under: Biology
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2 52307

Q:

The electronic dot and cross structure of ethene is ............

A)	B)
C)	D)

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