Some basic concepts of Chemistry

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Test1 Max. Marks = 40

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1. If 0.5 moles of BaCl₂ is mixed with 0.2 moles of Na₃PO₄, the maximum number of moles of Ba₃(PO₄)₂ that can be formed is -

4 points

(A) 0.2

(B) 0.5

(D) 0.1

Clear selection

2. 8.4 g MgCO₃ on heating leaves behind a residue weighing 4.0 g carbon dioxide released into the atmosphere at S.T.P. will be -

4 points

(A) 2.24 L

(B) 4.48 L

(D) 0.56 L

Clear selection

3. Iron forms two oxides, in first oxide 56 gram. Iron is found to be combined with 16 gram oxygen and in second oxide 112 gram. Iron is found to be combined with 48 gram oxygen. This data satisfy the law of -

4 points

(A) Conservation of mass

(B) Reciprocal proportion

(D) Combining volume

Clear selection

4. The number of molecules present in 88 g of CO₂ (Relative molecular mass of CO₂ = 44)

4 points

(A) 1.24 × 10²³

(B) 3.01 × 10²³

(D) 1.2046 ×10²⁴

Clear selection

5. Insulin contains 3.4% sulphur. What will be the minimum molecular weight of insulin ?

4 points

(A) 94.176

(B) 1884

(D) 976

Clear selection

6. Which has the highest weight?

4 points

(A) 1 m³ water

(B) 10 litre of Hg

(D) All have same weight

Clear selection

7. 4.48 L of methane at S.T.P. correspond to -

4 points

(A) 1.2 x 10²² molecules of methane

(B) 0.5 mole of methane

(D) 0.1 mole of methane

Clear selection

8. The chloride of a metal contains 71% chlorine by weight and the vapour density of it is 50. The atomic weight of the metal will be -

4 points

(A) 29

(B) 58

(D) 71

Clear selection

9. The empirical formula of a compound is CH. Its molecular weight is 78. The molecular formula of the compound will be -

4 points

(A) C₂H₂

(B) C₃H₃

(D) C₄H₄

Clear selection

10. An element A is tetravalent and another element B is divalent. The formula of the compound formed from these elements will be -

4 points

(A) A₂B

(B) AB

(D) A₂B₃

Clear selection

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