Which one of the following statements is not true
Options
(a) Variable valencies are shown by the transition elements (b) Electrons enter into the 3d-orbitals in the first series of the transition elements […]
Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential (E⁰ M²⁺/M) value has a positive sign
Options
(a) Co (Z […]
Which one of the following does not correctly represent the correct order of the property indicated against it
Options
(a) Ti < V < Cr < Mn; increasing number of oxidation states (b) […]
Identify the alloy containing a non – metal as a constituent in it
Options
(a) Invar (b) Steel (c) Bell metal (d) Bronze
Correct Answer:
Steel
Explanation:
No explanation available. Be the first […]
Which of the following pairs has the same size
Options
(a) Fe²⁺ , Ni²⁺ (b) Zr⁴⁺ , Ti⁴⁺ (c) Zr⁴⁺ , HF⁴⁺ (d) Zn²⁺ , HF⁴⁺
Correct Answer:
Zr⁴⁺ , HF⁴⁺
Explanation:
No […]
Which one of the elements with the following outer orbital configuration may exhibit the largest number of oxidation states
Options
(a) 3d⁵4s¹ (b) 3d⁵4s² (c) 3d²4s² (d) 3d³4s²
Correct Answer:
3d⁵4s²
Explanation:
Greater […]
The number of acidic protons in H₃PO₃ are
Options
(a) 0 (b) 1 (c) 2 (d) 3
Correct Answer:
2
Explanation:
No explanation available. Be the first to write the explanation for this […]
NO₂ is not obtained on heating
Options
(a) AgNO₃ (b) KNO₃ (c) Cu(NO₃)₂ (d) Pb(NO₃)₂
Correct Answer:
KNO₃
Explanation:
NO₂ is prepared by heating nitrates of heavy metals. 2pb(NO₃)₂ → 2pbO + 4NO₂ […]
Which of the following is used to prepare Cl₂ gas at room temperature from concentrated HCl
Options
(a) MnO₂ (b) H₂S (c) KMnO₄ (d) Cr₂O₃
Correct Answer:
KMnO₄
Explanation:
KMnO₄ oxidised halogen acids to […]
The reaction that takes place when Cl₂ gas is passed through conc.NaOH solution is
Options
(a) oxidation (b) reduction (c) displacement (d) disproportionation
Correct Answer:
disproportionation
Explanation:
3Cl₂ + 6NaOH → 5NaCl + […]
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