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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.
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.
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
4] Which of the following is not a mixture ?
a] kerosene
b] air
c] alcohol
d] petrol
Option(c) is the required answer.
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.
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.
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.
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.
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.
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.
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
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.
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:
\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.