The mass number of a nucleus is?
- A. Always less than its atomic number
- B. The sum of the number of protons and neutrons present in the nucleus
- C. Always more than the atomic weight
- D. A fraction
The reactivity of fluorine is due to?
- A. its high electro negativity
- B. small size of fluorine atom
- C. availability of D-orbitals
- D. strong f-f bond
Soaps clean surfaces on the principle based on?
- A. viscosity
- B. floatation
- C. elasticity
- D. surface tension
Which of the following is a form of calcium carbonate?
I. limestone
II. marble
III. chalk
Iv. egg-shells
- A. I only
- B. I, II and IV
- C. I and II only
- D. I, II, III, and IV
Neutrons were discovered by?
- A. James Chadwick
- B. Ernest Rutherford
- C. J.J Thompson
- D. John Dalton
A sample of any of the following substances disappears after some time when exposed to air like camphor, naphthalene, or dry ice. This phenomenon is called?
- A. Sublimation
- B. Evaporation
- C. Diffusion
- D. Radiation
The gas which causes global warming is?
- A. O\(_{2}\)
- B. CO\(_{2}\)
- C. N\(_{2}\)
- D. He
Which of the following are chemical changes?
I. cooking of food
II. digestion of food
III. freezing of water
IV. water is heated up
- A. I and II
- B. I, II, and III
- C. III and IV
- D. all of the above
Which of the following is a non-metal that remains liquid at room temperature?
- A. Chlorine
- B. Phosphorus
- C. Bromine
- D. Helium
Which one of the following is not a mixture?
- A. Air
- B. Mercury
- C. Milk
- D. Cement
A ‘breath test’ used by traffic police to check drunken driving uses?
- A. Tumeric on filter paper
- B. Silica gel coated with saliva nitrate
- C. Potassium permanganate-sulphuric acid
- D. Potassium dichromatic-sulphuric acid
What is the chemical name for the compound CuCO\(_{3}\)?
- A. Copper (iii) carbonate
- B. Copper (ii) carbonate
- C. Copper (i) carbonate
- D. Copper
What is the IUPAC name for the following compound? HC\(\equiv\)CCH\(_{3}\)
- A. Acetylene
- B. Methyl acetylene
- C. Butanol
- D. Decanoic acid
The scientist who stated that matter can be converted into energy is?
- A. Boyle
- B. Lavoiser
- C. Avogadro
- D. Einstein
The enzyme that converts glucose to ethyl alcohol is?
- A. maltase
- B. zymase
- C. Diatase
- D. Invertase
Give the common name for the following compound (CH\(_{3}\))\(_{2}\) CH CH\(_{2}\) -Br
- A. Isobutyl bromide
- B. Methyl bromide
- C. propyl bromide
- D. Butyl bromide