Which of the following compounds is consumed during the preparation of $Na_2CO_3$ by Solvay's process?
- A$NH_3, CaCO_3, NaCl$
- B$NH_4Cl, CaO, NaCl$
- C$CaCO_3, NaCl$
- D$NaCl, NH_4HCO_3$
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Which of the following statements is not true?
Match the following columns:
Column-$I$ Column-$II$ $(a)$ $Oscillatoria$ $(p)$ $Prothallus$ $(b)$ $Cycas$ $(q)$ $Cell$ $wall$ $contains$ $chitin$ $mixed$ $with$ $cellulose$ $(c)$ $Dryopteris$ $(r)$ $Primitive$ $flowers$ $(d)$ $Yeast$ $(s)$ $Food$ $stored$ $as$ $starch$
| Column-$I$ | Column-$II$ |
| $(a)$ $Oscillatoria$ | $(p)$ $Prothallus$ |
| $(b)$ $Cycas$ | $(q)$ $Cell$ $wall$ $contains$ $chitin$ $mixed$ $with$ $cellulose$ |
| $(c)$ $Dryopteris$ | $(r)$ $Primitive$ $flowers$ |
| $(d)$ $Yeast$ | $(s)$ $Food$ $stored$ $as$ $starch$ |
The metal ion present in vitamin $B_{12}$ is
Two satellites $A$ and $B$,having a ratio of masses $3 : 1$,are in circular orbits of radii $r$ and $4r$ respectively. Calculate the ratio of the total mechanical energy of $A$ and $B$.
Which of the following gates will have an output of $1$?
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