1g of pure calcium carbonate was found to require 50 mL of dilute HCl for complete reactions. The strength of the HCl solution is given by:

1. 4N

2. 2N

3. 0.4N

4. 0.2N

1.520g of the hydroxide of a metal on ignition gave 0.995 g of oxide. The equivalent mass of metal is:

1. 1.520

2. 0.995

3. 19.00

4. 9.00

The number of peroxide linkages in CrO₅ is /are

1. One

2. Two

3. Three

4. None of the above

The correct order of reducing power of halide ions is:

1. Cl^- > Br^- > I^- > F^-

2. Cl^- >  I^- > Br^- > F^-

3.  Br^- > Cl^- > I^- > F^-

4.  I^- > Br^- > Cl^- > F^-

Milliequivalents of a solute in a solution can be given by:

1. Mzeq_. = M x V_{in mL}

2. Meq. = N x V_{in mL}

3. Mzeq. = $\frac{mass}{Eq.<mspace\; width="1em"></mspace>mass}\times$1000

4. both 2 and 3

Which of the following shows the highest oxidation number in the combined state?

1. Os

2. Ru

3. Xe

4. All of the above

Which of the following reactions does not represent a redox change?

1. CaCO₃ $\to$CaO + CO₂

2. 2H₂ + O₂ $\to$2H₂O

3. Na + H₂O $\to$ NaOH + \(\frac{1}{2}\)H₂

4. MnCl₃ $\to$ MnCl₂ + \(\frac{1}{2}\)Cl₂

In which SO₂ acts as oxidant, while reacting with:

1. acidified KMnO₄

2. acidified K₂Cr₂O₇

3. H₂S

4. H₂0₂

Amongst the following species that have an atom in (+6) oxidation state is-

1. Mn${\mathrm{O}}_4^{-}$

2. Cr$(\mathrm{CN}{)}_6^{3-}$

3. Ni${\mathrm{F}}_6^{2-}$

4. CrO₂Cl₂

1.575 gm crystalline oxalic acid C₂H₂O₄· XH₂O$\mathrm{<span\; style="font-family:\; -apple-system,\; BlinkMacSystemFont,\; "Segoe\; UI",\; Roboto,\; "Helvetica\; Neue",\; Arial,\; "Noto\; Sans",\; sans-serif,\; "Apple\; Color\; Emoji",\; "Segoe\; UI\; Emoji",\; "Segoe\; UI\; Symbol",\; "Noto\; Color\; Emoji";\; font-size:\; 1rem;">is\; dissolved\; in\; water\; and\; diluted\; to\; 250\; ml.\; 25ml\; of\; this\; solution\; is\; completely\; neutralised\; with\; 250ml\; N/10\; NaOH.\; The\; value\; of\; \text{'}x\text{'}\; is </span>}$

1. Zero

2. 1

3. 2

4. 5