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Standard XI
Chemistry
Matter: States, Classification and Properties
Question

Classify the following into elements and compounds :

(i) $$ H_2 O $$
(ii) $$ He $$
(iii) $$ Cl $$
(iv)$$ CO $$
(v)$$ Co $$

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Solution
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(i). $$ H_2O $$- Compound
(ii). $$ He $$- Element
(iii). $$ Cl $$-Element
(iv). $$ CO $$ - compound
(v). $$Co $$- Element

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Q1
Classify the following into elements and compounds :

(i) $$ H_2 O $$
(ii) $$ He $$
(iii) $$ Cl $$
(iv)$$ CO $$
(v)$$ Co $$
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Q2
Classify the following into elements and compounds :
(i) H2O
(ii) He
(iii) Cl2
(iv) CO
(v) Co
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Q3

Classify the following substances into elements, compounds and mixtures:

(i) air (ii) common salt (iii) iron fillings (iv) marbles (v) oxygen (vi) milk (vii) zinc (viii) bronze (ix) sand (x) water


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Q4

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)

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Q5
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)
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