Questions
Element A has 2 electrons in its outermost shell and element B has 4 electrons in its outermost shell. The formula of the compound formed between A and B would be
- A2B3
- A4B2
- A2B
- A2B4
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Which of the following compounds is polar?
- CH4
- C2H2
- C2H3
- CHCl3
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The formula of a compound is A2B5. The number of electrons in the outermost shells of A and B, respectively, are
- 5 and 2
- 2 and 5
- 5 and 6
- 2 and 3
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During chemical combination, elements don't tend to
- lose electrons
- gain electrons
- share electrons
- undergo unstable configuration by losing, accepting or sharing the electrons
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Which of the following does not have hydrogen bonds?
- Phenol
- Liquid ammonia
- Water
- Liquid hydrochloric acid
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Which of the following molecules has bent geometry?
- Carbon dioxide
- Nitrogen oxide
- Ozone
- Methane
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What type of molecule is ammonia?
- Polar
- Non-polar
- Paramagnetic
- Lewis acid
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Which of the following is a covalent compound?
- Cao.
- KCl
- Na2S
- H2
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The hydrogen bonds are formed by
- Hf
- HCl
- HBr
- HI
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Which of the following molecules has the highest boiling point?
- Methane
- Ammonia
- Phosphine
- Hydrogen sulphide
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Which of the following statements is correct about solid NaCl?
- It is brittle.
- It is non-ionic.
- It is a non-conductor.
- It is a good conductor.
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In which of the following compounds are ionic, covalent and coordinate bonds present?
- H2O
- NH3
- KBr
- NaCN
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The electronic structure of an element A is 1s2; element B is 1s2 2s2 2p2; element C is 1s2 2s2 2p5; element D is 1s2 2s2 2p6.
Here, the tendency to form an electrovalent bond is large in
- A
- B
- C
- D
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The crystal lattice of electrovalent compound is composed of
- atoms
- molecules
- oppositely charged ions
- both molecules and ions
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How are ions formed from neutral atoms?
- By loss of electrons
- By gain of electrons
- By sharing of electrons
- By loss or gain of electrons
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