Which one of the following pairs has not been matched correctly?
(a) metal-gold
(b) non-metal−hydrogen
(c) compound−sugar
(d) monoatomic element−oxygen

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Solution

(d) monoatomic element–oxygen

Each molecule of oxygen consists of two bonded atoms. This is a diatomic element with formula O₂.

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Similar questions

Name:

(a) two metals which are liquid at room temperature,

(b) metal which do not corrode easily

(d) a non-metal which is lustrous,

(e) a non-metal which conducts electricity,

(f) a metal which is brittle,

(g) two elements which are monoatomic,

(h) two metallic oxides which are acidic,

(i) two metallic oxides which are amphoteric,

(j) two metallic which react with cold water,

(k) the compound responsible for green deposit on the surface of copper,

(l) a non-metal which can form a positive ion,

(m) a non-metal which shows reducing property,

(n) a metal whose oxide is reduced only by carbon.

Q. Which of the following pairs is not correctly matched with respect to the extraction of metals from their ores?

Match the following:

$\begin{matrix} (i) & Oxygen & (A) & Metal (ii) & Sodium & (B) & Metalloid (iii) & 2ex Boron & (C) & Non-metal (iv) & Gold (v) & Carbon dioxide \end{matrix}$

The correct pairs are:-

Match the following:

\begin{matrix} (i) & O x y g e n & (A) & M e t a l (i i) & S o d i u m & (B) & M e t a l l o i d (i i i) & B o r o n & (C) & N o n - m e t a l (i v) & G o l d (v) & C a r b o n d i o x i d e \end{matrix}

The correct pairs are:-

Q. (a) What is meant by the reactivity series of metals? Arrange the following metals in an increasing order of their reactivities towards water:
Zinc, Iron, Magnesium, Sodium
(b) Hydrogen is not a metal but still it has been assigned a place in the reactivity series of metals. Why?
(c) Name one metal more reactive and another less reactive than hydrogen.
(d) Name one metal which displaces copper from copper sulphate solution and one which does not.
(e) Name one metal which displaces silver from silver nitrate solution and one which does not.

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Which one of the following pairs has not been matched correctly? (a) metal-gold (b) non-metal−hydrogen (c) compound−sugar (d) monoatomic element−oxygen

(d) monoatomic element–oxygen Each molecule of oxygen consists of two bonded atoms. This is a diatomic element with formula O2.

Which one of the following pairs has not been matched correctly?
(a) metal-gold
(b) non-metal−hydrogen
(c) compound−sugar
(d) monoatomic element−oxygen

(d) monoatomic element–oxygen

Each molecule of oxygen consists of two bonded atoms. This is a diatomic element with formula O₂.