Question

Explain:

1. Nucleus of an atom carries positive charge

II. Most of the space in an atom is empty.

III. The whole mass of the atom is located in the centre of the atom.


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Answer 1

Answer:

Here's Your Answer

Explanation:

1. The nucleus has an overall positive charge as it contains the protons. Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.

2. The nucleus makes up a tiny proportion of the space occupied by an atom, while the electrons make up the rest. According to quantum electrodynamics, the space is filled by an electron field around the nucleus which neutralizes its charge and fills the space defining the atom size.

3. The mass of the atom is concentrated in the nucleus (protons and neutrons are about 2000 times as heavy as electrons).

Answer 2

Answer:

is called a universal solvent.

(A) Water

(B) Alcohol

(C) Petrol

(D) Ether

13.

Water is often treated with chlorine to:

(C) kill germs in it (D) make it colourle-

14.

(A) make it sweet (B) make it salty

The chemical formula of ice is:

(A) H

(B) O,

(C) HO

(D) H2O2

15.

Water, ice and steam are all:

(D) elements

(B) mixtures

(C) compounds

(D) none of these

16.

Water in its pure form is a:

(B) bad conductor of heat

(A)good conductor of heat

(D) none of these

(C)good conductor of electricity

Water is made of two elements, which are:

(A) both solids

(B) both liquids

(C) both gases

(D) one liquid and the other a gas

18. For rusting of iron to take place, are required.

(A) O, and Co, (B) H20 and N, (C) H,0 and 0, (D) H,O and H,

19. The water table of a place.

(A) changes from time to time

(B) changes from palce to place

(C) goes down when rains are less

(D) all of these

20. Which of the following is the most important factor in balancing the amount of fresh water

on earth?

(A) water cycle

(B) greenhouse effect

(C) WWTP

(D) transpiration

21. Which property of water is used while washing clothes?

(A) odour

(B) colour

(C) solubility (D) none of these

22. Which of the following is NOT soluble in water?

(A) salt

(B) sugar

(C) oxygen (D) none of these

23. By burning which of the following elements would you get water?

(A) Hydrogen (B) Oxygen

(C) Carbon (D) Nitrogen