NTA JEE Main 8 April 2018 Offline

An alkali is titrated against acid with methyl orange as an indicator, which of the following is a correct combination?

Hydrogen peroxide oxidises [Fe(CN)$$_6$$]$$^{4-}$$ to [Fe(CN)$$_6$$]$$^{3-}$$ in acidic medium, but reduces [Fe(CN)$$_6$$]$$^{3-}$$ to [Fe(CN)$$_6$$]$$^{4-}$$ in alkaline medium. The other products formed are, respectively:

When metal M is treated with NaOH, a white gelatinous precipitate X is obtained, which is soluble in excess of NaOH. Compound X when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal M is:

Which of the following compounds will be suitable for Kjeldahl's method for nitrogen estimation?

The trans-alkenes are formed by the reduction of alkynes with:

The recommended concentration of fluoride ion in drinking water is up to 1 ppm as fluoride ion is required to make teeth enamel harder by converting [3Ca$$_3$$(PO$$_4$$)$$_2$$.Ca(OH)$$_2$$] to:

Which type of 'defect' has the presence of cations in the interstitial sites?

For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point?

How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane? (Atomic weight of B = 10.8 u)

At 518$$^\circ$$C, the rate of decomposition of a sample of gaseous acetaldehyde, initially at a pressure of 363 Torr was 1.00 Torr s$$^{-1}$$ when 5% had reacted and 0.50 Torr s$$^{-1}$$ when 33% had reacted. The order of the reaction is: