Time Left:
600
sec
1. Phosphate ion has symbol
A. PO₄³⁻
B. PO₃²⁻
C. PO₄²⁻
D. P₂O₅
2. Valency of calcium is
A. 1
B. 2
C. 3
D. 4
3. Formula of potassium sulphate is
A. KSO₄
B. K₂SO₄
C. K₃SO₄
D. K₂S₂O₈
4. Quicklime is chemically
A. CaO
B. CaCO₃
C. Ca(OH)₂
D. CaSO₄
5. Baking powder contains
A. Sodium chloride
B. Sodium bicarbonate
C. Sodium sulphate
D. Sodium carbonate
6. Hydrogen bromide contains elements
A. Hydrogen and bromine
B. Hydrogen and oxygen
C. Hydrogen and chlorine
D. Bromine only
8. Molar mass of nitric acid (HNO₃) is
A. 62 u
B. 63 u
C. 64 u
D. 65 u
9. Sulphur molecule (S₈) has molecular mass
A. 16 u
B. 32 u
C. 128 u
D. 256 u
10. The concept of atomic mass was first proposed by
A. Dalton
B. Lavoisier
C. Rutherford
D. Thomson
11. The scientist who used specific symbols for elements for the first time was
A. Dalton
B. Proust
C. Lavoisier
D. Rutherford
12. The organization that approves the names and symbols of elements is
A. UNESCO
B. IUPAC
C. WHO
D. ISRO
13. Which one of the following is a monoatomic element?
A. Oxygen
B. Nitrogen
C. Helium
D. Sulphur
14. The simplest compounds made up of two elements are called
A. Mixtures
B. Binary compounds
C. Ternary compounds
D. Polyatomic compounds
15. The molecular mass of carbon dioxide (CO₂) is
A. 42 u
B. 44 u
C. 46 u
D. 48 u
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