JEE Main 2023 (Online) 24th January Evening Shift | p-Block Elements Question 32 | Chemistry

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JEE Main 2023 (Online) 24th January Evening Shift

MCQ (Single Correct Answer)

-1

$$\mathrm{K_2Cr_2O_7}$$ paper acidified with dilute $$\mathrm{H_2SO_4}$$ turns green when exposed to

Sulphur dioxide

Sulphur trioxide

Hydrogen sulphide

Carbon dioxide

JEE Main 2023 (Online) 24th January Morning Shift

MCQ (Single Correct Answer)

-1

Which of the following is true about freons?

These are radicals of chlorine and chlorine monoxide

These are chemicals causing skin cancer

All radicals are called freons

These are chlorofluorocarbon compounds

JEE Main 2023 (Online) 24th January Morning Shift

MCQ (Single Correct Answer)

-1

Which of the Phosphorus oxoacid can create silver mirror from $$\mathrm{AgNO_3}$$ solution?

$$\mathrm{H_4P_2O_5}$$

$$\mathrm{H_4P_2O_7}$$

$$\mathrm{(HPO_3)_n}$$

$$\mathrm{H_4P_2O_6}$$

JEE Main 2022 (Online) 29th July Evening Shift

MCQ (Single Correct Answer)

-1

When borax is heated with $$\mathrm{CoO}$$ on a platinum loop, blue coloured bead formed is largely due to

$$\mathrm{B}_{2} \mathrm{O}_{3}$$

$$\mathrm{Co}\left(\mathrm{BO}_{2}\right)_{2}$$

$$\mathrm{CoB}_{4} \mathrm{O}_{7}$$

$$\mathrm{Co}\left[\mathrm{B}_{4} \mathrm{O}_{5}(\mathrm{OH})_{4}\right]$$

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