Which of the following increases as boiling water changes to steam?
- A. temperature of the system
- B. degree of disorder in the system
- C. number of molecules
- D. activation energy
What are the values of x and y in the following equation? \(^{234}_{90}\)Th → \(^y_x\)Pa + ß- particle
- A. 91 234
- B. 92 235
- C. 89 235
- D. 88 238
What is the shape of a molecule of CCI4?
- A. Pyramidal
- B. Tetrahedral
- C. Trigonal planar
- D. Linear
A radioactive solid is best stored
- A. under paraffin oil
- B. under ultraviolet light
- C. in a cool, dark cupboard
- D. in a box lined with lead
Which of the following non-metals reacts most readily with metals?
- A. Nitrogen
- B. Chlorine
- C. Sulphur
- D. Carbon
Elactrostatic force of attraction between sodium ion and halide ion is greatest in
- A. NaCI
- B. NaBr
- C. NaF
- D. NaI
Which of the following contains co-ordinate covalent bond?
- A. HCI
- B. CH 4
- C. NH4
- D. Na+CI
The type of chemical bond that exists between potassium and oxygen in potassium oxide is
- A. ionic
- B. metallic
- C. covalent
- D. dative
Electrovalent compounds are characterized by
- A. solubility in ethanol
- B. high molar mass
- C. high melting point
- D. strong oxidizing ability
An element Z has a combining power of 3. Which of the following formulae is correct of its compounds?
- A. ZSO3
- B. Z3CI2
- C. Z 2O 3
- D. ZS3
Chlorine atom forms \(Cl^{-}\) by
- A. losing one electron
- B. Sharing one electron
- C. Donating lone pair of electrons
- D. Gaining one electron
The atoms of four elements are represented as 20Q, 16R, 10S and 8T Which of the elements would be unreactive?
- A. Q
- B. R
- C. S
- D. T