Crystalline sodium chloride is an insulator of electricity because $......$

The formula of azurite is

Which of the following is not added during the extraction of silver by the cyanide process?

Which of the following statements is $NOT$ correct?

Which of the following is a fossil plant?

$A$ ball rests upon a flat piece of paper on a table top. The paper is pulled horizontally but quickly towards the right as shown. Relative to its initial position with respect to the table,the ball :-
$(A)$ Remains stationary if there is no friction between the paper and the ball.
$(B)$ Moves to the left and starts rolling backwards,i.e.,to the left if there is friction between the paper and the ball.
$(C)$ Moves forward,i.e.,in the direction in which the paper is pulled if there is friction between the paper and the ball.
Here,the correct statement$(s)$ is/are :-