Basic Concepts in Chemistry-Concept of Atom, Molecule, Element and Compound (NEET Chemistry): Questions 1 - 6 of 14

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Question number: 1

» Basic Concepts in Chemistry » Concept of Atom, Molecule, Element and Compound

MCQ▾

Question

Two elements X and Y have atomic weights of 14 and 16. They form a series of compounds A, B, C, D and E in which the same amount of element X, Y is present in the ratio 1: 2: 3: 4: 5. If the compound A has 28 parts by weight of X and 16 parts by weight of Y, then the compound of C will have 28 parts weight of X and

Choices

Choice (4) Response

a.

80 parts by weight of Y

b.

32 parts by weight of Y

c.

48 parts by weight of Y

d.

64 parts by weight of Y

Question number: 2

» Basic Concepts in Chemistry » Concept of Atom, Molecule, Element and Compound

MCQ▾

Question

The most abundant element in earth’s crust is?

Choices

Choice (4) Response

a.

Oxygen

b.

Hydrogen

c.

Silicon

d.

Nitrogen

Question number: 3

» Basic Concepts in Chemistry » Concept of Atom, Molecule, Element and Compound

MCQ▾

Question

What is the chemical formula of calomel?

Choices

Choice (4) Response

a.

CaOCl2

b.

Hg2Cl2

c.

HgCl2

d.

CaO

Question number: 4

» Basic Concepts in Chemistry » Concept of Atom, Molecule, Element and Compound

MCQ▾

Question

A pure substance which contain only one type of atoms is called?

Choices

Choice (4) Response

a.

A compound

b.

A solid

c.

A liquid

d.

An element

Question number: 5

» Basic Concepts in Chemistry » Concept of Atom, Molecule, Element and Compound

MCQ▾

Question

The density of a liquid is 1.2g/mL . There are 35 drops in 2ml. The number of molecules in 1 drop is if molecular mass of liquid is 70?

Choices

Choice (4) Response

a.

1.235NA

b.

(135)2NA

c.

1.2NA

d.

1.2(35)2NA

Question number: 6

» Basic Concepts in Chemistry » Concept of Atom, Molecule, Element and Compound

MCQ▾

Question

A macromolecule of iron has molar mass 2800 amu. It contains 8 % iron by mass. The number of iron atom, in one formula unit of the macromolecule is?

Choices

Choice (4) Response

a.

2 atoms

b.

4 atoms

c.

6 atoms

d.

8 atoms

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