List of top Questions asked in AP EAMCET

Choose the incorrect statements regarding Siphonopoda:
I. They show open type of circulatory system.
II. Brain is enclosed in cartilaginous cranium.
III. Some possess ink gland.
IV. Development includes trochophore larva.

What are X and Y respectively in the following reactions? 


 

A ketone ‘X’ gives CH\(_3\) when reacted with NaOI. The product of X on reaction with NaBH\(_4\) followed by treatment with H\(_2\)O is:

Observe the following reactions: 

The correct answer is:

Two statements are given below:
I. Shaving soaps contain sodium carbonate
II. Laundry soaps contain sodium rosinates
The correct answer is:

Which of the following are present in DNA? 

 

Which of the following is vulcanised rubber?
The sum of coordination number and oxidation number of the metal M in the complex \[ [M({en})_2(C_2O_4)] \quad {(en = ethylenediamine)} \]
Which of the following reducing agents liberates hydrogen from dilute acid?
What are X and Y respectively in the following reactions? \[ {Cu} + {HNO}_3 \, ({dilute}) \rightarrow {Cu(NO}_3)_2 + {H}_2{O} + X \] \[ {Zn} + {HNO}_3 \, ({dilute}) \rightarrow {Zn(NO}_3)_2 + {H}_2{O} + Y \]
Which of the following is useful to verify the charge on colloidal particles?

Identify the correct statements from the following: 
[I.] At constant pressure, physical adsorption decreases with increase in temperature. 
[II.] Enthalpy of physisorption is higher than enthalpy of chemisorption. 
[III.] Gas mask used in coal mines consists of activated charcoal.

The rate constant of a first order reaction at 400 K and 500 K is respectively \( 2 \times 10^{-5} \, {s}^{-1} \) and \( 4 \times 10^{-3} \, {s}^{-1} \). What is the approximate activation energy (in kJ/mol\(^{-1}\))? (R = 8.3 J mol\(^{-1}\) K\(^{-1}\), log 2 = 0.3)
At 298 K, the density of an aqueous solution containing 82 g of acetic acid per dm\(^3\) is 1.01 kg dm\(^{-3}\). If the molarity of the solution is \(x\) M, the molality \(m\) of the same solution is (molar mass of acetic acid = 60 g mol\(^{-1}\)):
X-ray diffraction studies show that a metal 'M' crystallises in an fcc unit cell with edge length of 400 pm. If the density of the metal is \(7.5 \times 10^3 { kg/m}^{-3}\), the number of unit cells present in 0.015 kg of it is:

What is the percentage of carbon in the compound X, formed in the given sequence of reactions? 

In Kjeldahl's method of estimation of nitrogen, the ammonia evolved from 0.2 g of an organic compound was absorbed in 60 mL of 0.1 M $H_2SO_4$. If 40 mL of 0.1 M NaOH is required for complete neutralisation of the unused acid, the percentage of nitrogen in the compound is:
If the mean of the data 7, 8, 9, 7, 8, 7, \(\lambda\), 8 is 8, then the variance of the data:
Which one of the following pairs of gases does not represent the greenhouse gases?

Given are two statements regarding the properties of carbon in Group 14 of the periodic table: 
Statement-I: Carbon has the highest catenation power in group 14 elements. 
Statement-II: Carbon has small size and high electronegativity compared to other elements of group 14.

$BF_3 + LiAlH_4 \rightarrow X + LiF + AlF_3$. The incorrect statement about 'X' is:

The bicarbonate of which alkali metal does not exist as a solid?
The lattice of \(MH_{2.55}\) is different from the lattice of \(M\). What is \(M\)?
What is the conjugate base of \( OH^- \)?

One mole of compound AB reacts with one mole of compound CD according to the equation: \[ {AB} + {CD} \rightleftharpoons {AD} + {CB} \] At equilibrium, it was found that \(\frac{3}{4}\) mole of AB and CD had been converted to AD and CB. There is no change in volume. The equilibrium constant for the reaction is: