Question

Q.1 Multiple Choice Questions (5)

1) Which of the following statements are

correct for physical changes.

a. A physical change takes place due to

change in temperature and pressure. 

   

b. It is reversible.         

c.  The composition of matter remains

the same in physical change.         

d. All of the above.

2) Which of the following is a Dobereiner’s

triad.

a. Ne, Ca, Na  b. H , N , O c. Li,

Na, K          d. Na, Bx, Ax

3) Ethanoic acid with a strong base

sodium hydroxide forms a salt and

water. The reaction is said to be

a.  Neutralization

reaction

b. Organic salt-water

reaction

c.  Substitution

reaction

d.  Acid degrading

reaction

4) The specific heat of ............... is

maximum.

a. mercury  b. silver  c.

water               d. iron

5) Mendeleev’s periodic table was

organized on the basis of following

properties.

a. Only physical properties          

b. Only chemical properties         

c. Both physical and chemical

properties          

d. None of the above

(B) Solve the following question (5)

1) Find the odd one out.

A change in shape, New smell, Creation

of heat, production of light

2) Find co-related terms

Staining of Shahabad tile by lemon

juice : Chemical change : : Breaking of a

glass object on falling from a height :

...............

3) Match the pair.

Column "A" Column "B"

i.

Endothermic a. Heat is evolved

ii. Exothermic b. Heat has no role

  

c. Heat is

absorbed

4) State true or false.

PET is poly ethylene terephthalate.

5) Name the following

Write the IUPAC name of the following.

CH -CH -CH -CH

Q.2 A) Give scientific reason. (Any two)

1) In electrical equipment producing heat

e.g. iron, electric heater, boiler, toaster

etc. an alloy such as Nichrome is used

not pure metals.

2) Iron grills of doors and windows are

always painted.

3) Atomic size goes on decreasing while

going from left to right within a period.​

Answer 1

Answer:

question 1 answer d option

Explanation:

eg. wet clothes become dry clothes because of temperature like- sunlight,wind

the clothes remain same there is no change

and they can be wet again

Answer 2

Answer:

Ans.1- 1) a.

2)c.

3)a.

4)×

5)d.