Question

Properties of substances W, X, Y and Z are listed below:-W: A liquid metal X: A liquid non-metal Y: Gaseous non-metal Z: A non-metal which conducts electricity. W, X, Y and Z are respectively

a) Iron, iodine, hydrogen and oxygen

b) Gold, sulphur, chlorine and hydrogen

c) Copper, phosphorus, nitrogen and carbon

d) Mercury, bromine, oxygen and graphite.



Q23. Which of the following statements is incorrect?

a) Gold and silver are the most malleable and ductile metals.

b) All metals are hard and strong.

c) Mercury and gallium are metals which exist in liquid state at room temperature.

d) Most of the metals have high specific gravities.

​

Answer 1

★Question(1) :

Properties of substances W , X , Y , and Z are listed below

$\begin{array}{ | c | c | } \cline{1 - 2} \bf{substance} & \bf{properties} \\ \cline{1 - 2} \sf{ W}& \sf{a \: liquid \: metal }\\ \cline{1 - 2} \sf{X}& \sf{a \: liquid \: non metal} \\ \cline{1 - 2} \sf{Y} & \sf{gaseous \: non \: metal}\\ \cline{1 - 2} \sf{Z}& \sf{a \: non \: metal \: which \: conducts \: electricity} \\ \cline{1 - 2} \end{array}$

Then W , X , Y & Z are ,

a) Iron, iodine, hydrogen and oxygen

b) Gold, sulphur, chlorine and hydrogen

c) Copper, phosphorus, nitrogen and carbon

d) Mercury, bromine, oxygen and graphite.

★Answer(1) :

W : Mercury is the metal which is liquid at room temperature.

X : Bromine is the liquid Non metal at room temperature

Y : Oxygen is one of the example for gaseous non metals

Z : Graphite is a non metal which conducts electricity

The correct order is ,

Mercury , Bromine , Oxygen , Graphite .

Hence , Option(d) is the required answer.

$\rule{200}{1}$

★Question(2) :

Which of the following statements is incorrect?

a) Gold and silver are the most malleable and ductile metals.

b) All metals are hard and strong.

c) Mercury and gallium are metals which exist in liquid state at room temperature.

d) Most of the metals have high specific gravities.

★Answer(2) :

a] Gold and silver are the most malleable and ductile metals

True . Gold and silver are highly malleable and ductile in nature

∴ Option(a) is true

b] All metals ae hard and strong

There are some exceptional cases like sodium and potassium (which can be easily cut using a knife)

∴ Option(b) is incorrect

c] Mercury and gallium are metalsbwhich exsist in liquid state at room temperature

True.

d] Most of the metals have high specific gravities

True . Examples of some metals with high specific gravities are Lead ( Lead has the highest specific gravity)

So , Options(a) , Option(c) and Option(d) are correct

We are asked to find the incorrect option.

Hence , Option(b) is the required option

Answer 2

Answer:

★Question(1) :

Properties of substances W , X , Y , and Z are listed below

\begin{gathered}\begin{array}{ | c | c | } \cline{1 - 2} \bf{substance} & \bf{properties} \\ \cline{1 - 2} \sf{ W}& \sf{a \: liquid \: metal }\\ \cline{1 - 2} \sf{X}& \sf{a \: liquid \: non metal} \\ \cline{1 - 2} \sf{Y} & \sf{gaseous \: non \: metal}\\ \cline{1 - 2} \sf{Z}& \sf{a \: non \: metal \: which \: conducts \: electricity} \\ \cline{1 - 2} \end{array}\end{gathered}

\cline1−2substance

\cline1−2W

\cline1−2X

\cline1−2Y

\cline1−2Z

\cline1−2

properties

aliquidmetal

aliquidnonmetal

gaseousnonmetal

anonmetalwhichconductselectricity

Then W , X , Y & Z are ,

a) Iron, iodine, hydrogen and oxygen

b) Gold, sulphur, chlorine and hydrogen

c) Copper, phosphorus, nitrogen and carbon

d) Mercury, bromine, oxygen and graphite.

★Answer(1) :

W : Mercury is the metal which is liquid at room temperature.

X : Bromine is the liquid Non metal at room temperature

Y : Oxygen is one of the example for gaseous non metals

Z : Graphite is a non metal which conducts electricity

The correct order is ,

Mercury , Bromine , Oxygen , Graphite .

Hence , Option(d) is the required answer.

\rule{200}{1}

★Question(2) :

Which of the following statements is incorrect?

a) Gold and silver are the most malleable and ductile metals.

b) All metals are hard and strong.

c) Mercury and gallium are metals which exist in liquid state at room temperature.

d) Most of the metals have high specific gravities.

★Answer(2) :

a] Gold and silver are the most malleable and ductile metals

True . Gold and silver are highly malleable and ductile in nature

∴ Option(a) is true

b] All metals ae hard and strong

There are some exceptional cases like sodium and potassium (which can be easily cut using a knife)

∴ Option(b) is incorrect

c] Mercury and gallium are metalsbwhich exsist in liquid state at room temperature

True.

d] Most of the metals have high specific gravities

True . Examples of some metals with high specific gravities are Lead ( Lead has the highest specific gravity)

So , Options(a) , Option(c) and Option(d) are correct

We are asked to find the incorrect option.

Hence , Option(b) is the required option