The shape of CH₄ is

A. linear

B. planar

C. pyramidal

D. tetrahedral

The crystal layers in graphite are held together by

A. covalent bond

B. electrostatic forces

C. ionic bond

D. van der Waal's forces

Hydrogen bonds are formed between molecules containing a hydrogen atom bonded to a

A. strongly electronegative atom

B. non-polar species

C. diatomic element

D. complex ion

The two elements ₁₁X and ₁₉Y are in the same group because they have the same

A. valence electrons

B. ionization energy

C. number of shell

D. atomic size

Which of the following arrangements is in decreasing order of atomic radius?

A. Li>Be>C>

B. Li>B>Be>C

C. Li>Be>B>C

D. C>B>Be>Li

Which of the following processes is used in food preservation in an industry?

A. Carbon dating

B. Ieeadiation of gamma rays

C. Nuclear fission

D. Nuclear fusion

The electron configuration of 26Fe3+ is?

A. [Ar]4s²3d⁶

B. [AR]4s²3d³

C. [AR]4s¹3d⁴

D. [AR]4s⁰3d⁵

Which of the following transition metals is not attracted to external magnetic field?

A. Cu

B. Fe

C. Ti

D. Zn

An atom W has 17 electrons and 18 neutrons. Which of the following representations of the atom is correct?

A. ¹⁷₁₈W

B. ¹⁸₁₇W

C. ³⁵₁₇W

D. ³⁵₁₈W