Question

pls answer this
pls can anyone help plsssssssssssssssssssssssssssss
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Answer 1

$\Large\bigstar{\underline{\blue{\sf{Required\:Answer:-}}}}$

1] Which of the following is not an element ?

(a) graphite

(b) germanium

(c) silica

(d) Silicon

Silica is not an element . Hence , Option(c) is the required answer.

$\rule{300}{1}$

2] Which of the following are compounds ?

(i) CO (ii) No (iii) NO (iv)Co

a] (i) and (ii)

b] (ii) and (iii)

c] (i) and (iii)

d] (ii) and (iv)

Option(c) is the required answer.

$\rule{300}{1}$

3] One of the following substances is neither a good conductor of electricity nor an insulator . This substance is

a] Chromium

b] Germanium

c] Gallium

d] Potassium

Option(b) is the required answer

$\rule{300}{1}$

4] Which of the following is not a mixture ?

a] kerosene

b] air

c] alcohol

d] petrol

Option(c) is the required answer.

$\rule{300}{1}$

5] The element which is not common bewween the compounds called baking soda and soda is

a] Sodium

b] Hydrogen

c] oxygen

d] carbon

Option(b) is the required answer.

$\rule{300}{1}$

6] ' Is malleable and ductile ' best describes ?

a] solution

b] metal

c] compound

d] non-metal

Malleability and ductility are the properties of metals . Hence , Option(b) is the required answer.

$\rule{300}{1}$

7] Which one of the following is not a metalloid ?

a] boron

b] Silicon

c] gallium

d] germanium

Gallium is a metal . Hence , Option(c) is the required answer.

$\rule{300}{1}$

8] The elements which normally exsist in liquid state

a] Bromine and Iodine

b] Mercury and chlorine

c] Mercury and iodine

d] Bromine and mercury

Mercury and Bromine are the elements which normally exsist in liquid state . Hence , Option(d) is the required answer.

$\rule{300}{1}$

9] When a mixture of iron powder and sulphur powder are heated strongly to form Ironsulphide . Then the energy is :

a] released

b] first absorbed and then released

c] absorbed

d] neither absorbed nor released

The energy is absorbed first for excitation and then the energy is released. Hence , Option(b) is the required answer.

$\rule{300}{1}$

10] The property/properties which enable copper metal to be used for making wires is/are :

a] Copper metal is malleable and ductile

b] Copper metal is good conductor of electricity

c] Copper metal is ductile and has low electrical resistance

d] Copper metal is sonorous and an excellent conductor of electricity.

Copper metal is ductile and has low electrical resistance. Hence , Option(c) is the required answer.

$\rule{300}{1}$

11] On the basis of composition of matter , milk is consisdered to be ,

a] a pure substance

b] a impure substance

c] a element

d] a compound

Milk is an impure substance as it contains two or more substance withiut chemical bond . Hence , Option(b) is the required answer

$\rule{300}{1}$

12] Which of the following statements are true for pure substances ?

(i) Pure substances contain only one kind of particles

(ii) Pure substances may be a compound or a mixture

(iii) Pure substances have the same composition throughout

(iv) Pure substances can be exemplified by all substances except by nickel.

a] (i) and (ii)

b] (i) and (iii)

c] (iii) and (iv)

Option(b) is the required answer.

$\rule{300}{1}$

13] Which of the following are homogeneous in nature

(i) ice (ii) wood (iii) soil (iv) air

a] (i) and (iii)

b] (ii) and (iv)

c] (i) and (iv)

d] (iii) and (iv)

Option(c) is the required answer.

Answer 2

Answer:

\Large\bigstar{\underline{\blue{\sf{Required\:Answer:-}}}}★

RequiredAnswer:−

1] Which of the following is not an element ?

(a) graphite

(b) germanium

(c) silica

(d) Silicon

Silica is not an element . Hence , Option(c) is the required answer.

\rule{300}{1}

2] Which of the following are compounds ?

(i) CO (ii) No (iii) NO (iv)Co

a] (i) and (ii)

b] (ii) and (iii)

c] (i) and (iii)

d] (ii) and (iv)

Option(c) is the required answer.

\rule{300}{1}

3] One of the following substances is neither a good conductor of electricity nor an insulator . This substance is

a] Chromium

b] Germanium

c] Gallium

d] Potassium

Option(b) is the required answer

\rule{300}{1}

4] Which of the following is not a mixture ?

a] kerosene

b] air

c] alcohol

d] petrol

Option(c) is the required answer.

\rule{300}{1}

5] The element which is not common bewween the compounds called baking soda and soda is

a] Sodium

b] Hydrogen

c] oxygen

d] carbon

Option(b) is the required answer.

\rule{300}{1}

6] ' Is malleable and ductile ' best describes ?

a] solution

b] metal

c] compound

d] non-metal

Malleability and ductility are the properties of metals . Hence , Option(b) is the required answer.

\rule{300}{1}

7] Which one of the following is not a metalloid ?

a] boron

b] Silicon

c] gallium

d] germanium

Gallium is a metal . Hence , Option(c) is the required answer.

\rule{300}{1}

8] The elements which normally exsist in liquid state

a] Bromine and Iodine

b] Mercury and chlorine

c] Mercury and iodine

d] Bromine and mercury

Mercury and Bromine are the elements which normally exsist in liquid state . Hence , Option(d) is the required answer.

\rule{300}{1}

9] When a mixture of iron powder and sulphur powder are heated strongly to form Ironsulphide . Then the energy is :

a] released

b] first absorbed and then released

c] absorbed

d] neither absorbed nor released

The energy is absorbed first for excitation and then the energy is released. Hence , Option(b) is the required answer.

\rule{300}{1}

10] The property/properties which enable copper metal to be used for making wires is/are :

a] Copper metal is malleable and ductile

b] Copper metal is good conductor of electricity

c] Copper metal is ductile and has low electrical resistance

d] Copper metal is sonorous and an excellent conductor of electricity.

Copper metal is ductile and has low electrical resistance. Hence , Option(c) is the required answer.

\rule{300}{1}

11] On the basis of composition of matter , milk is consisdered to be ,

a] a pure substance

b] a impure substance

c] a element

d] a compound

Milk is an impure substance as it contains two or more substance withiut chemical bond . Hence , Option(b) is the required answer

\rule{300}{1}

12] Which of the following statements are true for pure substances ?

(i) Pure substances contain only one kind of particles

(ii) Pure substances may be a compound or a mixture

(iii) Pure substances have the same composition throughout

(iv) Pure substances can be exemplified by all substances except by nickel.

a] (i) and (ii)

b] (i) and (iii)

c] (iii) and (iv)

Option(b) is the required answer.

\rule{300}{1}

13] Which of the following are homogeneous in nature

(i) ice (ii) wood (iii) soil (iv) air

a] (i) and (iii)

b] (ii) and (iv)

c] (i) and (iv)

d] (iii) and (iv)

Option(c) is the required answer.