List of top Questions asked in TS EAMCET

Identify the reactions which give orthoboric acid from the following: \[ \text{I. Acidification of an aqueous solution of borax} \] \[ \text{II. Hydrolysis of diborane} \] \[ \text{III. Hydrolysis of boron trichloride} \]

The allotrope of carbon with aromatic character is:

Match the following:

Identify the correct statements from the following: I. Group 15 elements form electron rich hydrides II. Density of heavy water is higher than that of water III. Water containing soluble salts of magnesium and calcium is called soft water

Observe the following sequence of reactions and identify the correct statements about \(W\), \(X\) and \(Z\): \[ Ca + O_2 \rightarrow X \xrightarrow{H_2O} Y \xrightarrow{CO_2} Z \xrightarrow{-H_2O} Z \xrightarrow{H_2O/\text{ excess }CO_2} W \] I. W is soluble in water II. Z is used as mild abrasive in toothpaste III. X is slaked lime

Given below are two statements: Statement-I: Solubility of alkaline earth metal hydroxides in water increases down the group. Statement-II: Solubility of alkaline earth metal sulphates in water increases down the group.

In which of the following reactions \(\Delta S\) (entropy change) is positive?

Identify the correct orders for the given properties. I. C-H<C-O<N-O<C-C (Bond length) {II. } H_2S<O_3<NO_2<CO_2 (Bond angle) {III. } He_2^+<B_2<C_2<N_2 (Bond order)

Consider the following species: \[ Li_2,\; B_2,\; Be_2,\; C_2,\; O_2,\; O_2^{2-},\; F_2 \] The number of species with bond order value 1 is:

Which of the following statement is correct about the balanced equation given below? \[ Cr_2O_7^{2-}(aq)+14H^+(aq)+3S^{2-}(aq) \rightarrow 2Cr^{3+}(aq)+3S(s)+7H_2O(l) \]

Match the following.

2.9 g of a gas (molar mass \(40\,g\,mol^{-1}\)) at \(T(K)\) occupied the same volume as 0.184 g of dihydrogen at \(17^\circ C\) at the same pressure. The value of \(T(K)\) is:

The solubility of \(BaCO_3\) (molar mass \(197\,g\,mol^{-1}\)) is \(1.4\times10^{-3}\) g per 100 mL. The solubility product constant of \(BaCO_3\) is \(x\times10^{-9}\,mol^2L^{-2}\). The value of \(x\) (nearest integer) is:

The wavelength of electron in the orbit X of hydrogen atom is \(6\pi a_0\). What is the value of X? (\(a_0=\) radius of first orbit of hydrogen atom)

Identify the pairs in which electron gain enthalpy of the first element is more than that of the second element. \[ \text{I. } F,\ Br \] \[ \text{II. } Na,\ Li \] \[ \text{III. } S,\ O \]

The resultant logic gate of the combination of logic gates given in the circuit is:

The ratio of wavenumber of first line of Balmer series and wavenumber of second line of Lyman series of hydrogen atom is:

The layer of the atmosphere that efficiently reflects high frequency waves particularly at night is:

The substance which has an energy band gap equal to the energy of the spectral line corresponding to the shortest wavelength of Paschen series of the hydrogen spectrum is:

The number of alpha and beta decays occurred when \(_{92}^{238}U\) changes to \(_{82}^{206}Pb\) are respectively:

The rms value of electric field at a distance of 6 m from a 100 W bulb of efficiency 1.2% is:

An LC circuit with negligible resistance containing a 20 mH inductor and a 50 \(\mu F\) capacitor with an initial charge of 10 mC is closed at \(t=0\). Then the minimum time taken (in \(\mu s\)) for the total energy to be shared equally between the inductor and capacitor is:

If a radioactive substance decays by 40% and 70% in 10 and 30 minutes respectively, then the time taken for the substance to decay by 50% (in minutes) is:

A current of \(\frac{1}{3\pi}\,A\) passes through an ideal toroid of 900 turns per metre. If the relative permeability of the material of the core of the toroid is 400, then the magnetic field inside the core of the toroid is:

If a thin conducting wire of length \(12m\) carrying a current of \(2\sqrt3 A\) is bent into a regular hexagonal loop and placed in a uniform magnetic field of \(2T\), then the maximum torque acting on the loop is: