Choose the correct option in each of the following:-<br><b>1.</b> Which of the following is a liquid at ordinary temperature?<b>A. </b>Carbon <b>B.</b> Phosphorus <b>C.</b> Oxygen <b>D.</b> Bromine<br><b>2.</b> Which of the following is/are solid nonmetals?<b>A.</b> Carbon <b>B.</b> Sulpher <b>C.</b> Phosphorus <b>D.</b> All of these<br><b>3.</b> Which of the followings is the best conductor of electricity?<b>A.</b> Silver <b>B.</b> Copper <b>C.</b> Aluminium <b>D.</b> Iron<br><b>4.</b> Which of the following will displace copper from a solution of copper (II) sulphate?<b>A. </b>Magnesium <b>B.</b> Aluminium <b>C.</b> Iron <b>D.</b> All of these<br><b>5.</b> Which of the followings gases is used in advertisement signs?<b>A.</b> Hydrogen <b>B.</b> Oxygen <b>C.</b> Nitrogen <b>D.</b> Neon