Question

Q.1) Choice The Correct Option:- (10 Marks)

1. The most ductile metal is

a. Silver

b. Copper

c. Aluminium

d. Gold

2. Metals react with acids to produce respective salts with the evolution of

a. Hydrogen gas

b. Oxygen gas

c. Helium gas

d. None of these

3. Firework is an example of

a. Rapid combustion

b. Explosion

c. Spontaneous combustion

d. Slow combustion

4. Which chemical is used for rubbing the surface provided for matchsticks?

a. Sulphur

b. Gold

c. Red phosphorus

d. White phosphorus

5. Baking soda constitutes

a. Hydrogen chloride

b. Sodium oxide

c. Sodium bicarbonate

d. Oxygen

6. The control centre of all the activities of a cell is

a. Nucleus

b. Necleoplasm

c. Cytoplasm

d. Organelles

7. The colour organelles which are found in the plants only are

a. Chlorophyll

b. Plastids

c. Cytoplasm

d. Lysosomes​

Answer 1

Answer:

1.the most ductile metal is Gold.

2.metals react with acids to respective salts with evolution of Hydrogen Gas.

3.firework is an example of rapid combustion.

4. red phosphorus is the chemical used for rubbing the surface provided for matchsticks.

5.baking soda constitutes sodium bicarbonate.

6.the control centre of all activities in is nucleus.

7.the colour organelles which are found in plants only are plastids.

hope it helps you.

plz mark as brainliest answer.

Answer 2

» Required Answers:

1. The most ductile metal is :

$\red \bigstar$ $\boxed { \large \bf { Gold!! }}$

$\implies$ The property of metals to be drawn into wires is called ductility. Platinum is known to be most ductile metal and after that gold is the most ductile metal.

2. Metals react with acids to produce respective salts with the evolution of:

$\red \bigstar$ $\boxed { \large \bf { Hydrogen \: gas!! }}$

$\implies$ Metals react with acid to form salt and liberate hydrogen. Also metal differ in their reactivity with acids reactive metals like Sodium, Potassium and Calcium react violently whereas metals like magnesium, aluminium and zinc react mildly with acids.

3. Firework is an example of

$\red \bigstar$ $\boxed { \large \bf { Explosion!! }}$

$\implies$ When we burn fireworks, a sudden reaction takes place with the release of heat and light and sound is also produced. It explode on burning, therefore it is explosion.

4.Which chemical is used for rubbing the surface provided for matchsticks?

$\red \bigstar$ $\boxed { \large \bf { Red \: phosphorus!! }}$

5.Baking soda constitutes

$\red \bigstar$ $\boxed { \large \bf { Sodium \: bicarbonate!! }}$

6.The control centre of all the activities of a cell is

$\red \bigstar$ $\boxed { \large \bf { Nucleus!! }}$

$\implies$ Nucleus controls all the activities of the cell, it also regulates the cell cycle. Nucleus is made up of some parts :

• Nuclear pore
• Nucleoplasm
• Nucleolus
• Chromatin

7. The colour organelles which are found in the plants only are

$\red \bigstar$ $\boxed { \large \bf { Plastids!! }}$

$\implies$ They only are plastids because plastids are those organelle that provides colour to the leaf there are mainly three types of plastics chloroplast ,chromoplast, and leucoplast.

Chloroplast $\implies$ Gives green pigment.

Chromoplast $\implies$ Gives different colours ,they are found in the cells variegated leaves.

Leucoplast $\implies$ White in colour and present in the roots of the plants and responsible for the storage of food .

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